A fault monitoring and indicating control circuit for a lubricating oil pump power unit

Abstract

The application discloses a kind of with lubricating oil pump power equipment fault monitoring indication control loop, including the parallelly arranged lubricating oil pump control loop and main equipment control loop, the normally open contact SB2-1 of lubricating oil pump starting button SB2 in lubricating oil pump control loop and the coil of contactor KM1 are connected in parallel with lubricating oil pump startable indication loop and lubricating oil pump stoppable indication loop, the normally open contact SB4-1 of main equipment starting button SB4 in main equipment control loop and the coil of contactor KM2 are connected in parallel with main equipment startable indication loop and main equipment stoppable indication loop.Alarm on corresponding indication loop in the application emits sound, light, electricity and other signals, can be judged control loop failure before operation, improve the stability of equipment operation;Auxiliary contact of switch button contact and contactor related to the indication meaning of each indication loop is connected in series, without checking all contacts on control loop one by one when failure occurs.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power equipment control circuit, in particular to a fault monitoring and indication control circuit of power equipment with lubricating oil pump. BACKGROUND

[0002] In the industrial production process, in order to ensure full lubrication of large power equipment, a dedicated lubricating oil pump is provided. At present, the power equipment with lubricating oil pump adopts the operation mode of starting the lubricating oil pump first and then starting the main equipment at start-up, and stopping the main equipment first and then stopping the lubricating oil pump at shutdown. The main circuit is shown in Figure 1 The contactor KM1, the lubricating oil pump thermal relay FR1 and the lubricating oil pump M1 form the lubricating oil pump main circuit, and the contactor KM2, the main equipment thermal relay FR2 and the main equipment M2 form the main equipment main circuit. The control circuit is shown in Figure 2 The control circuit adopts sequential start-up and reverse sequence stop, specifically, the normally closed contact SB1-1 of the lubricating oil pump stop button SB1, the normally open contact SB2-1 of the lubricating oil pump start button SB2, the coil of the contactor KM1 and the lubricating oil pump thermal relay FR1 are connected in series to form the lubricating oil pump control circuit, and the normally open contact KM2-2 of the contactor KM2 is connected in parallel to the normally closed contact SB1-1 of the lubricating oil pump stop button SB1, and the normally open contact KM1-1 of the contactor KM1 is connected in parallel to the normally open contact SB2-1 of the lubricating oil pump start button SB2; the normally closed contact SB3-1 of the main equipment stop button SB3, the normally open contact SB4-1 of the main equipment start button SB4, the normally open contact KM1-2 of the contactor KM1, the coil of the contactor KM2 and the main equipment thermal relay FR2 are connected in series to form the main equipment control circuit, and the normally open contact KM2-1 of the contactor KM2 is connected in parallel to the normally open contact SB4-1 of the main equipment start button SB4. The control principle is as follows:

[0003] Before starting, since the coil of the contactor KM1 is not electrified, the normally open contact KM1-2 of the contactor KM1 on the main equipment control circuit is in the normally open state, even if the main equipment start button SB4 is pressed to make the normally open contact SB4-1 of the main equipment start button SB4 closed, the main equipment M2 cannot be started.

[0004] At the start, first start the lubricating oil pump M1, press the lubricating oil pump start button SB2, the normally open contact SB2-1 is closed, the coil of the contactor KM1 is electrified, the main contact of the contactor KM1 is closed, the lubricating oil pump M1 starts, the normally open contact KM1-1 is closed, so that the coil of the contactor KM1 is in the electrified state, at the same time, the normally open contact KM1-2 on the main equipment control circuit is closed; then start the main equipment M2, press the main equipment start button SB4, the normally open contact SB4-1 is closed, the coil of the contactor KM2 is electrified, the main contact of the contactor KM2 is closed, the main equipment M2 starts, the normally open contact KM2-1 is closed, so that the coil of the contactor KM2 is in the electrified state; at the same time, the normally open contact KM2-2 on the lubricating oil pump control circuit is also closed, in the case of the main equipment M2 running, even if the lubricating oil pump stop button SB1 is pressed, the lubricating oil pump M1 cannot stop.

[0005] At the stop, first stop the main equipment M2, press the main equipment stop button SB3, the normally closed contact SB3-1 is opened, the coil of the contactor KM2 is de-energized, the main contact of the contactor KM2 is opened, the main equipment M2 stops, the normally open contact KM2-1 is opened, the normally open contact KM2-2 is opened; then, stop the lubricating oil pump M1, press the lubricating oil pump stop button SB1, the normally closed contact SB1-1 is opened, the coil of the contactor KM1 is de-energized, the main contact of the contactor KM1 is opened, the lubricating oil pump M1 stops, the normally open contact KM1-1 is opened, the normally open contact KM1-2 is opened, the control circuit forms the state before starting, even if the start button SB4 is pressed, the main equipment M2 cannot start.

[0006] However, in actual use, the existing control circuit has the following problems:

[0007] 1. Because the starting and stopping sequence of the lubricating oil pump M1 and the main equipment M2 has strict requirements, when the lubricating oil pump M1 or the main equipment M2 starts or stops, whether the lubricating oil pump M1 and the main equipment M2 are in a startable or stoppable state is not clearly indicated, and often after the start / stop button is actually pressed, the operator can determine whether the control circuit has failed by the running state of the lubricating oil pump M1 or the main equipment M2, causing fault judgment and processing lag, which greatly affects the stable operation of the equipment.

[0008] 2. When the lubricating oil pump M1 cannot start, all contacts on the lubricating oil pump control circuit need to be checked one by one; similarly, when the main equipment M2 cannot start, the lubricating oil pump M1 cannot stop, etc., because the contactors KM1 and KM2 are provided with contacts on the lubricating oil pump control circuit and the main equipment control circuit, all contacts on the two control circuits need to be checked one by one, causing complex fault checking and low maintenance efficiency.

[0009] 3. The thermal relay FR1 for the lubricating oil pump and the thermal relay FR2 for the main equipment are independently controlled. When the thermal relay FR1 for the lubricating oil pump experiences overload protection, the lubricating oil pump M1 stops running, the normally open contact KM1-2 of the contactor KM1 opens, the main equipment control circuit is disconnected, and the main equipment M2 stops running. However, if the normally open contact KM1-2 of the contactor KM1 also fails at the same time as the thermal relay FR1 for overload protection, the main equipment control circuit cannot be disconnected in time. In this case, the main equipment M2 will continue to run when the lubricating oil pump M1 stops. Therefore, the safety of the control circuit still needs to be further improved. Summary of the Invention:

[0010] The purpose of this invention is to provide a fault monitoring and indication control circuit for a power device with a lubricating oil pump.

[0011] The present invention is implemented by the following technical solution: a fault monitoring and indication control circuit with a lubricating oil pump power equipment, including a lubricating oil pump control circuit and a main equipment control circuit. The lubricating oil pump control circuit includes a lubricating oil pump thermal relay FR1, a normally closed contact SB1-1 of a lubricating oil pump stop button SB1, a normally open contact SB2-1 of a lubricating oil pump start button SB2, and a coil of a contactor KM1 connected in series. The normally open contact KM1-1 of the contactor KM1 is connected in parallel to the normally open contact SB2-1 of the lubricating oil pump start button SB2.

[0012] The main equipment control circuit is connected in parallel to the normally closed contact SB1-1 of the lubricating oil pump stop button SB1, the normally open contact SB2-1 of the lubricating oil pump start button SB2, and the coil of the contactor KM1.

[0013] The main equipment control circuit includes, in series, the main equipment thermal relay FR2, the normally open contact KM1-2 of the contactor KM1, the normally closed contact SB3-1 of the main equipment stop button SB3, the normally open contact SB4-1 of the main equipment start button SB4, and the coil of the contactor KM2. The normally open contact KM2-1 of the contactor KM2 is connected in parallel to the normally open contact SB4-1 of the main equipment start button SB4.

[0014] The normally open contact KM2-2 of the contactor KM2 is connected in parallel to the normally closed contact SB1-1 of the lubricating oil pump stop button SB1;

[0015] A lubricating oil pump startable indication circuit is connected in parallel to the normally open contact SB2-1 of the lubricating oil pump start button SB2 and the coil of the contactor KM1. The lubricating oil pump startable indication circuit includes the normally closed contact SB2-2 of the lubricating oil pump start button SB2, the normally closed contact KM1-3 of the contactor KM1, and the lubricating oil pump startable alarm device, which are connected in series.

[0016] Further, the lubricating oil pump startable indication circuit is connected in parallel with the lubricating oil pump stoppable indication circuit on the lubricating oil pump startable indication circuit, and the lubricating oil pump stoppable indication circuit comprises, in sequence and in series, the normally closed contact KM2-3 of the contactor KM2, the normally closed contact SB2-3 of the lubricating oil pump start button SB2, the normally open contact KM1-4 of the contactor KM1, and a lubricating oil pump stoppable alarm device.

[0017] Preferably, a main device startable indication circuit is connected in parallel with the normally open contact SB4-1 of the main device start button SB4 and the coil of the contactor KM2, and the main device startable indication circuit comprises, in sequence and in series, the normally closed contact SB4-2 of the main device start button SB4, the normally closed contact KM2-4 of the contactor KM2, and a main device startable alarm device.

[0018] Preferably, a main device stoppable indication circuit is connected in parallel with the normally open contact SB4-1 of the main device start button SB4 and the coil of the contactor KM2, and the main device stoppable indication circuit comprises, in sequence and in series, the normally closed contact SB4-3 of the main device start button SB4, the normally open contact KM2-5 of the contactor KM2, and a main device stoppable alarm device.

[0019] Preferably, the lubricating oil pump startable alarm device, the lubricating oil pump stoppable alarm device, the main device startable alarm device, and the main device stoppable alarm device are sound and / or light alarms.

[0020] The present application has the following advantages:

[0021] 1. The present application has the lubricating oil pump startable indication circuit and the lubricating oil pump stoppable indication circuit connected in parallel on the lubricating oil pump control circuit, has the main device startable indication circuit and the main device stoppable indication circuit on the main device control circuit, and has the alarm devices on the corresponding indication circuits emit sound and / or light signals in the operation steps of the start-stop device, so that the operator can determine whether the device indicated by the control circuit reaches the startable / stoppable condition according to whether the corresponding alarm device emits sound and / or light signals, thereby avoiding the judgment of whether the control circuit is faulty according to the running state of the device after the actual start-stop operation is performed, and improving the stability of the device running.

[0022] 2. In the present application, the contacts of the switch buttons and the auxiliary contacts of the contactors related to the indication meaning of the indication circuit are connected in series on each indication circuit, and if the alarm device in the corresponding indication circuit does not emit a signal during the execution of the start-stop operation of the device, the switch buttons and the contactors corresponding to all the contacts on the indication circuit are checked, without the need to check all the contacts on the control circuit one by one, so that the fault checking is simple, and the maintenance efficiency is greatly improved.

[0023] 3、The main equipment control loop in the application is connected in parallel with the normally closed contact SB1-1 of the lubricating oil pump stop button SB1, the normally open contact SB2-1 of the lubricating oil pump start button SB2 and the coil of the contactor KM1 of the lubricating oil pump control loop, when the lubricating oil pump thermal relay FR1 occurs overheat protection, the lubricating oil pump control loop loses power, the lubricating oil pump M1 stops at the same time, the main equipment control loop loses power, and the normally open contact KM1-2 of the contactor KM1 on the main equipment control loop is opened, double disconnection of the main equipment control loop is realized, it is ensured that the main equipment M2 cannot run in the state that the lubricating oil pump M1 stops, and the safety of the control loop protecting the main equipment is improved. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, below the drawings needed to be used in the embodiments or prior art description will be briefly introduced, obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating labor.

[0025] Figure 1 The main circuit diagram of the main equipment with lubricating oil pump power equipment;

[0026] Figure 2 The control circuit diagram of the main equipment with lubricating oil pump power equipment at present;

[0027] Figure 3 The control circuit diagram of the embodiment 1 of the present application;

[0028] Figure 4 The control circuit diagram of the embodiment 2 of the present application;

[0029] Figure 5 The control circuit diagram of the embodiment 3 of the present application;

[0030] Figure 6 The control circuit diagram of the embodiment 4 of the present application.

[0031] In the figure, the lubricating oil pump control loop 1, the main equipment control loop 2, the lubricating oil pump startable indication loop 3, the lubricating oil pump startable alarm device 4, the lubricating oil pump stoppable indication loop 5, the lubricating oil pump stoppable alarm device 6, the main equipment startable indication loop 7, the main equipment startable alarm device 8, the main equipment stoppable indication loop 9, the main equipment stoppable alarm device 10, the lubricating oil pump stop button SB1, the lubricating oil pump start button SB2, the contactor KM1, the main equipment stop button SB3, the main equipment start button SB4, the contactor KM2, the lubricating oil pump thermal relay FR1, the main equipment thermal relay FR2. DETAILED DESCRIPTION

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1

[0034] like Figure 3 As shown, a fault monitoring and indication control circuit for a power equipment with a lubricating oil pump includes a lubricating oil pump control circuit 1 and a main equipment control circuit 2. The lubricating oil pump control circuit 1 includes a lubricating oil pump thermal relay FR1, a normally closed contact SB1-1 of a lubricating oil pump stop button SB1, a normally open contact SB2-1 of a lubricating oil pump start button SB2, and a coil of a contactor KM1 connected in series. The normally open contact KM1-1 of the contactor KM1 is connected in parallel to the normally open contact SB2-1 of the lubricating oil pump start button SB2.

[0035] The main equipment control circuit 2 is connected in parallel to the normally closed contact SB1-1 of the lubricating oil pump stop button SB1, the normally open contact SB2-1 of the lubricating oil pump start button SB2, and the coil of contactor KM1.

[0036] The main equipment control circuit 2 includes the main equipment thermal relay FR2, the normally open contact KM1-2 of contactor KM1, the normally closed contact SB3-1 of main equipment stop button SB3, the normally open contact SB4-1 of main equipment start button SB4, and the coil of contactor KM2 connected in series. The normally open contact KM2-1 of contactor KM2 is connected in parallel with the normally open contact SB4-1 of main equipment start button SB4, and the normally open contact KM2-2 of contactor KM2 is connected in parallel with the normally closed contact SB1-1 of lubricating oil pump stop button SB1.

[0037] A lubricating oil pump startable indicator circuit 3 is connected in parallel to the normally open contact SB2-1 of the lubricating oil pump start button SB2 and the coil of the contactor KM1. The lubricating oil pump startable indicator circuit 3 includes the normally closed contact SB2-2 of the lubricating oil pump start button SB2, the normally closed contact KM1-3 of the contactor KM1, and the lubricating oil pump startable alarm device 4, which are connected in series.

[0038] In this embodiment, the alarm device 4 that can be activated by the lubricating oil pump is an audible and visual alarm.

[0039] Control loop working principle:

[0040] like Figure 3As shown, before starting, due to the coil of the contactor KM1 being not electrified, the normally open contact KM1-2 of the contactor KM1 on the main equipment control circuit 2 is in the normally open state, and even if the main equipment start button SB4 is pressed, the main equipment M2 cannot start. At this time, on the lubricating oil pump control circuit 1, the normally closed contact SB1-1 of the lubricating oil pump stop button SB1 is closed, and on the lubricating oil pump startable indication circuit 3, the normally closed contact SB2-2 of the lubricating oil pump start button SB2 and the normally closed contact KM1-3 of the contactor KM1 are all in the closed state, and the lubricating oil pump startable alarm device 4 is electrified to issue an audible and visual signal to indicate that the lubricating oil pump M1 can be started. If the lubricating oil pump startable alarm device 4 does not issue an audible and visual signal, the operator should avoid starting the lubricating oil pump M1, and troubleshoot all contacts of the lubricating oil pump stop button SB1, the lubricating oil pump start button SB2, and the auxiliary contact of the contactor KM1, and after troubleshooting and processing, the next operation can be performed.

[0041] Start the lubricating oil pump, press the lubricating oil pump start button SB2, the normally open contact SB2-1 of the lubricating oil pump start button SB2 is closed, the coil of the contactor KM1 is electrified, the main contact of the contactor KM1 is closed, the lubricating oil pump M1 starts, the normally open contact KM1-1 of the contactor KM1 is closed, and the coil of the contactor KM1 is kept in the electrified state. At this time, the normally open contact KM1-2 of the contactor KM1 on the main equipment control circuit 2 is closed, and the function of starting the main equipment can be realized only after the lubricating oil pump runs.

[0042] Start the main equipment, press the main equipment start button SB4, the normally open contact SB4-1 of the main equipment start button SB4 is closed, the coil of the contactor KM2 is electrified, the main contact of the contactor KM2 is closed, the main equipment M2 starts, the normally open contact KM2-1 of the contactor KM2 is closed, and the coil of the contactor KM2 is kept in the electrified state. At this time, on the lubricating oil pump control circuit 1, the normally open contact KM2-2 of the contactor KM2 is closed, and the function of stopping the lubricating oil pump M1 even if the lubricating oil pump stop button SB1 is pressed under the condition that the main equipment runs.

[0043] Stop the main equipment, press the main equipment stop button SB3, the normally closed contact SB3-1 is opened, the coil of the contactor KM2 is de-energized, the main contact of the contactor KM2 is opened, the main equipment M2 stops, the normally open contact KM2-1 is opened, and the contactor KM2 remains in the de-energized state. At this time, on the lubricating oil pump control circuit 1, the normally open contact KM2-2 of the contactor KM2 is opened, and the stop function of the lubricating oil pump stop button SB1 is restored.

[0044] The lubricating oil pump is stopped, the lubricating oil pump stop button SB1 is pressed, the normally closed contact SB1-1 of the lubricating oil pump stop button SB1 is opened, the coil of the contactor KM1 is de-energized, the main contact of the contactor KM1 is opened, the lubricating oil pump M1 is stopped, and the normally open contact KM1-1 is opened, so that the coil of the contactor KM1 is in a de-energized state. At this time, on the lubricating oil pump startable indication circuit 3, the normally closed contact KM1-3 of the contactor KM1 is closed, the lubricating oil pump startable alarm device 4 is energized, and it is indicated that the lubricating oil pump is startable. Similarly, if the lubricating oil pump startable alarm device 4 does not issue an audible and visual signal, the operator should avoid starting the lubricating oil pump M1, and the contacts of the lubricating oil pump stop button SB1 and the lubricating oil pump start button SB2, and the auxiliary contact of the contactor KM1 should be checked. After the fault is checked and handled, the next operation can be performed.

[0045] Correspondingly, during the start-stop process of the lubricating oil pump and the main equipment, if the lubricating oil pump startable alarm device 4 is in a de-energized state and does not issue an audible and visual signal, but still issues an audible and visual signal, at this time, the fault checking method is the same as when the lubricating oil pump startable alarm device 4 should be in an energized state and issue an audible and visual signal, but does not issue an audible and visual signal. The corresponding contacts are checked, and after the fault is checked and handled, the next operation can be performed.

[0046] Embodiment 2

[0047] As shown in Figure 4 A fault monitoring and indication control circuit with a lubricating oil pump power device includes a lubricating oil pump control circuit 1 and a main equipment control circuit 2. The lubricating oil pump control circuit 1 includes, in series, a lubricating oil pump thermal relay FR1, a normally closed contact SB1-1 of a lubricating oil pump stop button SB1, a normally open contact SB2-1 of a lubricating oil pump start button SB2, and a coil of a contactor KM1. A normally open contact KM1-1 of the contactor KM1 is connected in parallel to the normally open contact SB2-1 of the lubricating oil pump start button SB2.

[0048] The main equipment control circuit 2 is connected in parallel to the normally closed contact SB1-1 of the lubricating oil pump stop button SB1, the normally open contact SB2-1 of the lubricating oil pump start button SB2, and the coil of the contactor KM1.

[0049] The main equipment control circuit 2 includes, in series, a main equipment thermal relay FR2, a normally open contact KM1-2 of the contactor KM1, a normally closed contact SB3-1 of a main equipment stop button SB3, a normally open contact SB4-1 of a main equipment start button SB4, and a coil of a contactor KM2. A normally open contact KM2-1 of the contactor KM2 is connected in parallel to the normally open contact SB4-1 of the main equipment start button SB4.

[0050] The normally open contact KM2-2 of contactor KM2 is connected in parallel to the normally closed contact SB1-1 of the lubricating oil pump stop button SB1.

[0051] A lubricating oil pump startable indicator circuit 3 is connected in parallel to the normally open contact SB2-1 of the lubricating oil pump start button SB2 and the coil of the contactor KM1. The lubricating oil pump startable indicator circuit 3 includes the normally closed contact SB2-2 of the lubricating oil pump start button SB2, the normally closed contact KM1-3 of the contactor KM1, and the lubricating oil pump startable alarm device 4, which are connected in series.

[0052] The lubricating oil pump start indicator circuit 3 is connected in parallel with the lubricating oil pump stop indicator circuit 5. The lubricating oil pump stop indicator circuit 5 includes the normally closed contact KM2-3 of contactor KM2, the normally closed contact SB2-3 of lubricating oil pump start button SB2, the normally open contact KM1-4 of contactor KM1, and the lubricating oil pump stop alarm device 6, which are connected in series.

[0053] In this embodiment, the alarm device 4 for starting the lubricating oil pump and the alarm device 6 for stopping the lubricating oil pump are both audible and visual alarms.

[0054] Control loop working principle:

[0055] like Figure 4 As shown, before startup, since the coil of contactor KM1 is not energized, the normally open contact KM1-2 of contactor KM1 in the main equipment control circuit 2 is in the normally open state. Even if the main equipment start button SB4 is pressed, the main equipment M2 cannot start. At this time, in the lubricating oil pump control circuit 1, the normally closed contact SB1-1 of the lubricating oil pump stop button SB1 is closed, and in the lubricating oil pump startable indicator circuit 3, the normally closed contact SB2-2 of the lubricating oil pump start button SB2 and the normally closed contact KM1-3 of contactor KM1 are both in the closed state. The lubricating oil pump startable alarm device 4 is energized and emits an audible and visual signal to indicate that the lubricating oil pump M1 can start, while the lubricating oil pump stopable alarm device 6 is de-energized. If the lubricating oil pump can be started but the alarm device 4 does not emit an audible and visual signal, the operator should avoid starting the lubricating oil pump M1, check all contacts of the lubricating oil pump stop button SB1 and the lubricating oil pump start button SB2, as well as the auxiliary contacts of the contactor KM1, and proceed to the next step only after the fault has been identified and resolved.

[0056] The lubricating oil pump is started, the lubricating oil pump starting button SB2 is pressed, the normally open contact SB2-1 of the lubricating oil pump starting button SB2 is closed, the coil of the contactor KM1 is electrified, the main contact of the contactor KM1 is closed, the lubricating oil pump M1 is started, the normally open contact KM1-1 of the contactor KM1 is closed, and the coil of the contactor KM1 is kept in the electrified state. At this time, (1) the normally open contact KM1-2 of the contactor KM1 on the main equipment control circuit 2 is closed, and the function of the main equipment can be started only after the lubricating oil pump is started; (2) on the lubricating oil pump startable indication circuit 3, the normally closed contact KM1-3 of the contactor KM1 is opened, and the lubricating oil pump startable alarm device 4 is de-energized; (3) on the lubricating oil pump stoppable indication circuit 5, the normally open contact KM1-4 of the contactor KM1 is closed, the lubricating oil pump stoppable alarm device 6 is energized, and an audible and visual signal is sent to indicate that the lubricating oil pump is stoppable. If the lubricating oil pump stoppable alarm device 6 does not send an audible and visual signal, the operator should avoid stopping the lubricating oil pump M1, and check all contacts of the lubricating oil pump starting button SB2, and the auxiliary contacts of the contactor KM1 and the contactor KM2. After troubleshooting and processing, the next operation can be performed.

[0057] The main equipment is started, the main equipment starting button SB4 is pressed, the normally open contact SB4-1 of the main equipment starting button SB4 is closed, the coil of the contactor KM2 is electrified, the main contact of the contactor KM2 is closed, the main equipment M2 is started, the normally open contact KM2-1 of the contactor KM2 is closed, and the coil of the contactor KM2 is kept in the electrified state. At this time, (1) on the lubricating oil pump control circuit 1, the normally open contact KM2-2 of the contactor KM2 is closed, and the function that the lubricating oil pump M1 cannot be stopped even if the lubricating oil pump stop button SB1 is pressed is realized under the condition that the main equipment is running; (2) on the lubricating oil pump stoppable indication circuit 5, the normally closed contact KM2-3 of the contactor KM2 is opened, and the lubricating oil pump stoppable alarm device 6 is de-energized.

[0058] Stop the main device, press the main device stop button SB3, the normally closed contact SB3-1 is opened, the coil of the contactor KM2 loses power, the main contact of the contactor KM2 is opened, the main device M2 is stopped, the normally open contact KM2-1 is opened, and the contactor KM2 remains in the power loss state. At this time, (1) on the lubricating oil pump control circuit 1, the normally open contact KM2-2 of the contactor KM2 is opened, and the stop function of the lubricating oil pump stop button SB1 is restored; (2) on the lubricating oil pump stoppage indication circuit 5, the normally closed contact KM2-3 of the contactor KM2 is closed, the lubricating oil pump stoppage alarm device 6 is powered on, and an audible and visual signal is emitted to indicate that the lubricating oil pump can be stopped. Similarly, if the lubricating oil pump stoppage alarm device 6 does not emit an audible and visual signal after the lubricating oil pump M1 is started, the operator should avoid starting the main device M2 and stopping the lubricating oil pump M1, and troubleshoot the contacts of the lubricating oil pump start button SB2 and the auxiliary contacts of the contactor KM1 and the contactor KM2. After troubleshooting and processing, the next operation can be performed.

[0059] Stop the lubricating oil pump, press the lubricating oil pump stop button SB1, the normally closed contact SB1-1 of the lubricating oil pump stop button SB1 is opened, the coil of the contactor KM1 loses power, the main contact of the contactor KM1 is opened, the lubricating oil pump M1 is stopped, and the normally open contact KM1-1 is opened, so that the coil of the contactor KM1 is in a power loss state. At this time, (1) on the lubricating oil pump stoppage indication circuit 5, the normally open contact KM1-4 of the contactor KM1 is opened, and the lubricating oil pump stoppage alarm device 6 loses power; (3) on the lubricating oil pump start indication circuit 3, the normally closed contact KM1-3 of the contactor KM1 is closed, the lubricating oil pump start alarm device 4 is powered on, and it is indicated that the lubricating oil pump can be started. Similarly, if the lubricating oil pump start alarm device 4 does not emit an audible and visual signal after the lubricating oil pump M1 is started, the operator should avoid starting the lubricating oil pump M1, and troubleshoot the contacts of the lubricating oil pump stop button SB1 and the lubricating oil pump start button SB2 and the auxiliary contacts of the contactor KM1. After troubleshooting and processing, the next operation can be performed.

[0060] Correspondingly, during the start and stop of the lubricating oil pump and the main device, if the lubricating oil pump start alarm device 4 and the lubricating oil pump stoppage alarm device 6 should be in a power loss state and not emit an audible and visual signal, but still emit an audible and visual signal, at this time, the troubleshooting method is the same as when the alarm device should be in a power-on state and emit an audible and visual signal, but does not emit an audible and visual signal. The corresponding contacts are troubleshooted, and the next operation can be performed after troubleshooting and processing.

[0061] Example 3

[0062] As Figure 5As shown, a kind of lubricating oil pump power equipment failure monitoring indication control circuit, including lubricating oil pump control circuit 1 and main equipment control circuit 2, lubricating oil pump control circuit 1 includes the coil of lubricating oil pump thermal relay FR1, the normally closed contact SB1-1 of lubricating oil pump stop button SB1, the normally open contact SB2-1 of lubricating oil pump start button SB2 and contactor KM1 in series, the normally open contact KM1-1 of contactor KM1 is connected in parallel on the normally open contact SB2-1 of lubricating oil pump start button SB2;

[0063] Main equipment control circuit 2 is connected in parallel on the normally closed contact SB1-1 of lubricating oil pump stop button SB1, the normally open contact SB2-1 of lubricating oil pump start button SB2 and the coil of contactor KM1,

[0064] Main equipment control circuit 2 includes main equipment thermal relay FR2, the normally open contact KM1-2 of contactor KM1, the normally closed contact SB3-1 of main equipment stop button SB3, the normally open contact SB4-1 of main equipment start button SB4 and the coil of contactor KM2 in series, the normally open contact KM2-1 of contactor KM2 is connected in parallel on the normally open contact SB4-1 of main equipment start button SB4;

[0065] The normally open contact KM2-2 of contactor KM2 is connected in parallel on the normally closed contact SB1-1 of lubricating oil pump stop button SB1;

[0066] The lubricating oil pump startable indication circuit 3 is connected in parallel on the normally open contact SB2-1 of lubricating oil pump start button SB2 and the coil of contactor KM1, and the lubricating oil pump startable indication circuit 3 includes the normally closed contact SB2-2 of lubricating oil pump start button SB2, the normally closed contact KM1-3 of contactor KM1 and the lubricating oil pump startable alarm device 4 in series.

[0067] The lubricating oil pump stoppable indication circuit 5 is connected in parallel on the lubricating oil pump startable indication circuit 3, and the lubricating oil pump stoppable indication circuit 5 includes the normally closed contact KM2-3 of contactor KM2, the normally closed contact SB2-3 of lubricating oil pump start button SB2, the normally open contact KM1-4 of contactor KM1 and the lubricating oil pump stoppable alarm device 6 in series.

[0068] The main equipment startable indication circuit 7 is connected in parallel on the normally open contact SB4-1 of main equipment start button SB4 and the coil of contactor KM2, and the main equipment startable indication circuit 7 includes the normally closed contact SB4-2 of main equipment start button SB4, the normally closed contact KM2-4 of contactor KM2 and the main equipment startable alarm device 8 in series.

[0069] In this embodiment, the alarm device 4 for starting the lubricating oil pump, the alarm device 6 for stopping the lubricating oil pump, and the alarm device 8 for starting the main equipment are audible and visual alarms.

[0070] Control loop working principle:

[0071] like Figure 5 As shown, before startup, since the coil of contactor KM1 is not energized, the normally open contact KM1-2 of contactor KM1 in the main equipment control circuit 2 is in the normally open state. Even if the main equipment start button SB4 is pressed, the main equipment M2 cannot start. At this time, in the lubricating oil pump control circuit 1, the normally closed contact SB1-1 of the lubricating oil pump stop button SB1 is closed, and in the lubricating oil pump startable indication circuit 3, the normally closed contact SB2-2 of the lubricating oil pump start button SB2 and the normally closed contact KM1-3 of contactor KM1 are both in the closed state. The lubricating oil pump startable alarm device 4 is energized and emits an audible and visual signal to indicate that the lubricating oil pump M1 can start. The lubricating oil pump stopable alarm device 6 and the main equipment startable alarm device 8 are both in a de-energized state. If the lubricating oil pump can be started but the alarm device 4 does not emit an audible and visual signal, the operator should avoid starting the lubricating oil pump M1, check all contacts of the lubricating oil pump stop button SB1 and the lubricating oil pump start button SB2, as well as the auxiliary contacts of the contactor KM1, and proceed to the next step only after the fault has been identified and resolved.

[0072] The lubricating oil pump is started, the lubricating oil pump starting button SB2 is pressed, the normally open contact SB2-1 of the lubricating oil pump starting button SB2 is closed, the coil of the contactor KM1 is electrified, the main contact of the contactor KM1 is closed, the lubricating oil pump M1 is started, the normally open contact KM1-1 of the contactor KM1 is closed, and the coil of the contactor KM1 is kept in the electrified state. At this time, (1) the normally open contact KM1-2 of the contactor KM1 on the main equipment control loop 2 is closed, and the function of the main equipment can be started only after the lubricating oil pump is started; (2) on the lubricating oil pump startable indication loop 3, the normally closed contact KM1-3 of the contactor KM1 is opened, and the lubricating oil pump startable alarm device 4 is de-energized; (3) on the lubricating oil pump stoppable indication loop 5, the normally open contact KM1-4 of the contactor KM1 is closed, the lubricating oil pump stoppable alarm device 6 is energized, and an audible and visual signal is sent to indicate that the lubricating oil pump is stoppable; (4) on the main equipment startable indication loop 7, the main equipment startable alarm device 8 is energized, and an audible and visual signal is sent to indicate that the main equipment is startable. If the lubricating oil pump stoppable alarm device 6 does not send an audible and visual signal, the operator should avoid stopping the operation of the lubricating oil pump M1, and check all contacts of the lubricating oil pump starting button SB2, and the auxiliary contacts of the contactor KM1 and the contactor KM2; if the main equipment startable alarm device 8 does not send an audible and visual signal, the operator should avoid starting the operation of the main equipment M2, and check all contacts of the main equipment stop button SB3 and the main equipment starting button SB4, and the auxiliary contacts of the contactor KM2; after troubleshooting and processing, the next operation can be performed.

[0073] The main equipment is started, the main equipment starting button SB4 is pressed, the normally open contact SB4-1 of the main equipment starting button SB4 is closed, the coil of the contactor KM2 is electrified, the main contact of the contactor KM2 is closed, the main equipment M2 is started, the normally open contact KM2-1 of the contactor KM2 is closed, and the coil of the contactor KM2 is kept in the electrified state. At this time, (1) on the lubricating oil pump control loop 1, the normally open contact KM2-2 of the contactor KM2 is closed, and the function of the main equipment can be started even if the lubricating oil pump stop button SB1 is pressed; (2) on the lubricating oil pump stoppable indication loop 5, the normally closed contact KM2-3 of the contactor KM2 is opened, and the lubricating oil pump stoppable alarm device 6 is de-energized; (3) on the main equipment startable indication loop 7, the normally closed contact KM2-4 of the contactor KM2 is opened, and the main equipment startable alarm device 8 is de-energized.

[0074] Stop the main device, press the main device stop button SB3, the normally closed contact SB3-1 is opened, the coil of the contactor KM2 loses power, the main contact of the contactor KM2 is opened, the main device M2 is stopped, the normally open contact KM2-1 is opened, and the contactor KM2 remains in the power loss state. At this time, (1) on the lubricating oil pump control circuit 1, the normally open contact KM2-2 of the contactor KM2 is opened, and the stop function of the lubricating oil pump stop button SB1 is restored; (2) on the main device startable indication circuit 7, the normally closed contact KM2-4 of the contactor KM2 is closed, the main device startable alarm device 8 is powered on, and an audible and visual signal is emitted to indicate that the main device is startable; (3) on the lubricating oil pump stoppage indication circuit 5, the normally closed contact KM2-3 of the contactor KM2 is closed, the lubricating oil pump stoppage alarm device 6 is powered on, and an audible and visual signal is emitted to indicate that the lubricating oil pump is stoppage. Similarly, if the lubricating oil pump stoppage alarm device 6 and the main device startable alarm device 8 do not emit an audible and visual signal after troubleshooting, the operator should avoid starting the main device M2 and stopping the lubricating oil pump M1, and troubleshoot all contacts of the lubricating oil pump start button SB2 and the main device start button SB4, as well as the auxiliary contacts of the contactor KM1 and the contactor KM2. After troubleshooting and processing, the next operation can be performed.

[0075] Stop the lubricating oil pump, press the lubricating oil pump stop button SB1, the normally closed contact SB1-1 of the lubricating oil pump stop button SB1 is opened, the coil of the contactor KM1 loses power, the main contact of the contactor KM1 is opened, the lubricating oil pump M1 is stopped, and the normally open contact KM1-1 is opened, so that the coil of the contactor KM1 is in a power loss state. At this time, (1) on the main device control circuit 2, the normally open contact KM1-2 of the contactor KM1 is opened, the main device control circuit 2, the main device startable indication circuit 7, and the main device stoppage indication circuit 9 are all in a power loss state, and the main device startable alarm device 8 loses power; (2) on the lubricating oil pump stoppage indication circuit 5, the normally open contact KM1-4 of the contactor KM1 is opened, and the lubricating oil pump stoppage alarm device 6 loses power; (3) on the lubricating oil pump startable indication circuit 3, the normally closed contact KM1-3 of the contactor KM1 is closed, the lubricating oil pump startable alarm device 4 is powered on, and the lubricating oil pump is indicated to be startable. Similarly, if the lubricating oil pump startable alarm device 4 does not emit an audible and visual signal after troubleshooting, the operator should avoid starting the lubricating oil pump M1, and troubleshoot all contacts of the lubricating oil pump stop button SB1 and the lubricating oil pump start button SB2, as well as the auxiliary contacts of the contactor KM1. After troubleshooting and processing, the next operation can be performed.

[0076] Correspondingly, during the start-up and shutdown of the lubricating oil pump and the main equipment, if the lubricating oil pump can start alarm device 4, the lubricating oil pump can stop alarm device 6, and the main equipment can start alarm device 8 are in a de-energized state and do not emit audible and visual signals, but still emit audible and visual signals, then the troubleshooting method is the same as when the alarm device should be in an energized state and emit audible and visual signals, but does not emit audible and visual signals. The corresponding contacts are checked, and the next step can only be carried out after the fault is checked and dealt with.

[0077] Example 4

[0078] like Figure 6 As shown, a fault monitoring and indication control circuit for a power equipment with a lubricating oil pump includes a lubricating oil pump control circuit 1 and a main equipment control circuit 2. The lubricating oil pump control circuit 1 includes a lubricating oil pump thermal relay FR1, a normally closed contact SB1-1 of a lubricating oil pump stop button SB1, a normally open contact SB2-1 of a lubricating oil pump start button SB2, and a coil of a contactor KM1 connected in series. The normally open contact KM1-1 of the contactor KM1 is connected in parallel to the normally open contact SB2-1 of the lubricating oil pump start button SB2.

[0079] The main equipment control circuit 2 is connected in parallel to the normally closed contact SB1-1 of the lubricating oil pump stop button SB1, the normally open contact SB2-1 of the lubricating oil pump start button SB2, and the coil of contactor KM1.

[0080] The main equipment control circuit 2 includes the main equipment thermal relay FR2, the normally open contact KM1-2 of contactor KM1, the normally closed contact SB3-1 of main equipment stop button SB3, the normally open contact SB4-1 of main equipment start button SB4, and the coil of contactor KM2 connected in series. The normally open contact KM2-1 of contactor KM2 is connected in parallel with the normally open contact SB4-1 of main equipment start button SB4.

[0081] The normally open contact KM2-2 of contactor KM2 is connected in parallel to the normally closed contact SB1-1 of the lubricating oil pump stop button SB1.

[0082] A lubricating oil pump startable indicator circuit 3 is connected in parallel to the normally open contact SB2-1 of the lubricating oil pump start button SB2 and the coil of the contactor KM1. The lubricating oil pump startable indicator circuit 3 includes the normally closed contact SB2-2 of the lubricating oil pump start button SB2, the normally closed contact KM1-3 of the contactor KM1, and the lubricating oil pump startable alarm device 4, which are connected in series.

[0083] The lubricating oil pump start indicator circuit 3 is connected in parallel with the lubricating oil pump stop indicator circuit 5. The lubricating oil pump stop indicator circuit 5 includes the normally closed contact KM2-3 of contactor KM2, the normally closed contact SB2-3 of lubricating oil pump start button SB2, the normally open contact KM1-4 of contactor KM1, and the lubricating oil pump stop alarm device 6, which are connected in series.

[0084] A main equipment startable indication circuit 7 is connected in parallel to the normally open contact SB4-1 of the main equipment start button SB4 and the coil of the contactor KM2. The main equipment startable indication circuit 7 includes the normally closed contact SB4-2 of the main equipment start button SB4, the normally closed contact KM2-4 of the contactor KM2, and the main equipment startable alarm device 8 connected in series.

[0085] A main equipment stop indication circuit 9 is connected in parallel to the normally open contact SB4-1 of the main equipment start button SB4 and the coil of the contactor KM2. The main equipment stop indication circuit 9 includes the normally closed contact SB4-3 of the main equipment start button SB4, the normally open contact KM2-5 of the contactor KM2, and the main equipment stop alarm device 10 connected in series.

[0086] In this embodiment, the alarm device 4 for starting the lubricating oil pump, the alarm device 6 for stopping the lubricating oil pump, the alarm device 8 for starting the main equipment, and the alarm device 10 for stopping the main equipment are audible and visual alarms.

[0087] Control loop working principle:

[0088] like Figure 6 As shown, before startup, since the coil of contactor KM1 is not energized, the normally open contact KM1-2 of contactor KM1 in the main equipment control circuit 2 is in the normally open state. Even if the main equipment start button SB4 is pressed, the main equipment M2 cannot start. At this time, in the lubricating oil pump control circuit 1, the normally closed contact SB1-1 of the lubricating oil pump stop button SB1 is closed, and in the lubricating oil pump startable indicator circuit 3, the normally closed contact SB2-2 of the lubricating oil pump start button SB2 and the normally closed contact KM1-3 of contactor KM1 are all in the closed state. The lubricating oil pump startable alarm device 4 is energized and emits an audible and visual signal to indicate that the lubricating oil pump M1 can start. The lubricating oil pump stopable alarm device 6, the main equipment startable alarm device 8, and the main equipment stopable alarm device 10 are all in a de-energized state. If the lubricating oil pump can be started but the alarm device 4 does not emit an audible and visual signal, the operator should avoid starting the lubricating oil pump M1, check all contacts of the lubricating oil pump stop button SB1 and the lubricating oil pump start button SB2, as well as the auxiliary contacts of the contactor KM1, and proceed to the next step only after the fault has been identified and resolved.

[0089] The lubricating oil pump is started, the lubricating oil pump starting button SB2 is pressed, the normally open contact SB2-1 of the lubricating oil pump starting button SB2 is closed, the coil of the contactor KM1 is electrified, the main contact of the contactor KM1 is closed, the lubricating oil pump M1 is started, the normally open contact KM1-1 of the contactor KM1 is closed, and the coil of the contactor KM1 is kept in the electrified state. At this time, (1) the normally open contact KM1-2 of the contactor KM1 on the main equipment control circuit 2 is closed, and the function of the main equipment can be started only after the lubricating oil pump is started; (2) on the lubricating oil pump startable indication circuit 3, the normally closed contact KM1-3 of the contactor KM1 is opened, and the lubricating oil pump startable alarm device 4 is de-energized; (3) on the lubricating oil pump stoppable indication circuit 5, the normally open contact KM1-4 of the contactor KM1 is closed, the lubricating oil pump stoppable alarm device 6 is energized, and an audible and visual signal is sent to indicate that the lubricating oil pump is stoppable; (4) on the main equipment startable indication circuit 7, the main equipment startable alarm device 8 is energized, and an audible and visual signal is sent to indicate that the main equipment is startable. If the lubricating oil pump stoppable alarm device 6 does not send an audible and visual signal, the operator should avoid stopping the lubricating oil pump M1, and check all contacts of the lubricating oil pump starting button SB2, and the auxiliary contacts of the contactor KM1 and the contactor KM2; if the main equipment startable alarm device 8 does not send an audible and visual signal, the operator should avoid starting the main equipment M2, and check all contacts of the main equipment stop button SB3 and the main equipment starting button SB4, and the auxiliary contacts of the contactor KM2; after troubleshooting and processing, the next operation can be performed.

[0090] The main equipment is started, the main equipment starting button SB4 is pressed, the normally open contact SB4-1 of the main equipment starting button SB4 is closed, the coil of the contactor KM2 is electrified, the main contact of the contactor KM2 is closed, the main equipment M2 is started, the normally open contact KM2-1 of the contactor KM2 is closed, and the coil of the contactor KM2 is kept in the electrified state. At this time, (1) on the lubricating oil pump control circuit 1, the normally open contact KM2-2 of the contactor KM2 is closed, and the function of the main equipment is started, even if the lubricating oil pump stop button SB1 is pressed, the lubricating oil pump M1 cannot be stopped; (2) on the lubricating oil pump stoppable indication circuit 5, the normally closed contact KM2-3 of the contactor KM2 is opened, and the lubricating oil pump stoppable alarm device 6 is de-energized; (3) on the main equipment startable indication circuit 7, the normally closed contact KM2-4 of the contactor KM2 is opened, and the main equipment startable alarm device 8 is de-energized; (4) on the main equipment stoppable indication circuit 9, the normally open contact KM2-5 of the contactor KM2 is closed, the main equipment stoppable alarm device 10 is energized, and an audible and visual signal is sent to indicate that the main equipment is stoppable. If the main equipment stoppable alarm device 10 does not send an audible and visual signal, the operator should avoid stopping the main equipment, and check all contacts of the main equipment starting button SB4 and the auxiliary contacts of the contactor KM2; after troubleshooting and processing, the next operation can be performed.

[0091] Stop the main device, press the main device stop button SB3, the normally closed contact SB3-1 is opened, the coil of the contactor KM2 loses power, the main contact of the contactor KM2 is opened, the main device M2 is stopped, the normally open contact KM2-1 is opened, and the contactor KM2 remains in a power loss state. At this time, (1) on the lubricating oil pump control circuit 1, the normally open contact KM2-2 of the contactor KM2 is opened, and the stop function of the lubricating oil pump stop button SB1 is restored; (2) on the main device stop indication circuit 9, the normally open contact KM2-5 of the contactor KM2 is opened, and the main device stop alarm device 10 loses power; (3) on the main device start indication circuit 7, the normally closed contact KM2-4 of the contactor KM2 is closed, the main device start alarm device 8 is powered on, and an audible and visual signal is emitted to indicate that the main device can be started; (4) on the lubricating oil pump stop indication circuit 5, the normally closed contact KM2-3 of the contactor KM2 is closed, the lubricating oil pump stop alarm device 6 is powered on, and an audible and visual signal is emitted to indicate that the lubricating oil pump can be stopped. Similarly, if the lubricating oil pump stop alarm device 6 does not emit an audible and visual signal after troubleshooting of the lubricating oil pump M1 starts, the operator should avoid stopping the lubricating oil pump M1 operation, and troubleshoot all contacts of the lubricating oil pump start button SB2 and the auxiliary contacts of the contactor KM1 and the contactor KM2; if the main device start alarm device 8 does not emit an audible and visual signal, the operator should avoid starting the main device M2 operation, and troubleshoot all contacts of the main device stop button SB3 and the main device start button SB4 and the auxiliary contacts of the contactor KM2; after troubleshooting and processing, the next operation can be performed.

[0092] To stop the lubricating oil pump, press the lubricating oil pump stop button SB1. The normally closed contact SB1-1 of the lubricating oil pump stop button SB1 opens, the coil of contactor KM1 is de-energized, the main contact of contactor KM1 opens, the lubricating oil pump M1 stops, and the normally open contact KM1-1 opens, so that the coil of contactor KM1 is in a de-energized state. At this time, (1) on the main equipment control circuit 2, the normally open contact KM1-2 of contactor KM1 opens, the main equipment control circuit 2, the main equipment startable indicator circuit 7, and the main equipment stopable indicator circuit 9 are all de-energized, and the main equipment startable alarm device 8 is de-energized; (2) on the lubricating oil pump stopable indicator circuit 5, the normally open contact KM1-4 of contactor KM1 opens, and the lubricating oil pump stopable alarm device 6 is de-energized; (3) on the lubricating oil pump startable indicator circuit 3, the normally closed contact KM1-3 of contactor KM1 closes, the lubricating oil pump startable alarm device 4 is energized, and the lubricating oil pump can be started. Similarly, as with troubleshooting before starting the lubricating oil pump M1, if the lubricating oil pump can be started but the alarm device 4 does not emit an audible and visual signal, the operator should avoid starting the lubricating oil pump M1 and check all contacts of the lubricating oil pump stop button SB1, the lubricating oil pump start button SB2, and the auxiliary contacts of the contactor KM1. The next step can only be carried out after the fault has been checked and dealt with.

[0093] Correspondingly, during the start-up and shutdown of the lubricating oil pump and the main equipment, if the lubricating oil pump can start alarm device 4, the lubricating oil pump can stop alarm device 6, the main equipment can start alarm device 8, or the main equipment can stop alarm device 10 are in a de-energized state and do not emit audible and visual signals, but still emit audible and visual signals, then the troubleshooting method is the same as when the alarm device should be in an energized state and emit audible and visual signals, but does not emit audible and visual signals. The corresponding contacts are checked, and the next step can only be carried out after the fault is checked and dealt with.

[0094] Thermal relay working principle:

[0095] like Figures 3-6 As shown, the main equipment control circuit 2 is connected in parallel to the normally closed contact SB1-1 of the lubricating oil pump stop button SB1, the normally open contact SB2-1 of the lubricating oil pump start button SB2, and the coil of the contactor KM1. When the lubricating oil pump thermal relay FR1 overheats, at the same time as the lubricating oil pump control circuit 1 loses power and the lubricating oil pump M1 stops, (1) the main equipment control circuit 2 loses power, and (2) the normally open contact KM1-2 of the contactor KM1 on the main equipment control circuit 2 opens, achieving a double disconnection of the main equipment control circuit 2, ensuring that the main equipment M2 cannot operate when the lubricating oil pump M1 stops, further improving the safety of the control circuit in protecting the main equipment.

[0096] The above merely provides the preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A fault monitoring and indication control circuit for a power unit with a lubricating oil pump, comprising a lubricating oil pump control circuit and a main equipment control circuit, characterized in that, The lubricating oil pump control circuit includes a lubricating oil pump thermal relay FR1, a normally closed contact SB1-1 of a lubricating oil pump stop button SB1, a normally open contact SB2-1 of a lubricating oil pump start button SB2, and a coil of a contactor KM1 connected in series. The normally open contact KM1-1 of the contactor KM1 is connected in parallel to the normally open contact SB2-1 of the lubricating oil pump start button SB2. The main equipment control circuit is connected in parallel to the normally closed contact SB1-1 of the lubricating oil pump stop button SB1, the normally open contact SB2-1 of the lubricating oil pump start button SB2, and the coil of the contactor KM1. The main equipment control circuit includes, in series, the main equipment thermal relay FR2, the normally open contact KM1-2 of the contactor KM1, the normally closed contact SB3-1 of the main equipment stop button SB3, the normally open contact SB4-1 of the main equipment start button SB4, and the coil of the contactor KM2. The normally open contact KM2-1 of the contactor KM2 is connected in parallel to the normally open contact SB4-1 of the main equipment start button SB4. The normally open contact KM2-2 of the contactor KM2 is connected in parallel to the normally closed contact SB1-1 of the lubricating oil pump stop button SB1; A lubricating oil pump startable indication circuit is connected in parallel to the normally open contact SB2-1 of the lubricating oil pump start button SB2 and the coil of the contactor KM1. The lubricating oil pump startable indication circuit includes the normally closed contact SB2-2 of the lubricating oil pump start button SB2, the normally closed contact KM1-3 of the contactor KM1, and the lubricating oil pump startable alarm device, which are connected in series.

2. The fault monitoring and indication control circuit for a power equipment with a lubricating oil pump according to claim 1, characterized in that, The lubricating oil pump start indicator circuit is connected in parallel with the lubricating oil pump stop indicator circuit. The lubricating oil pump stop indicator circuit includes the normally closed contact KM2-3 of the contactor KM2, the normally closed contact SB2-3 of the lubricating oil pump start button SB2, the normally open contact KM1-4 of the contactor KM1, and the lubricating oil pump stop alarm device, which are connected in series.

3. A fault monitoring and indication control circuit for a power equipment with a lubricating oil pump according to any one of claims 1-2, characterized in that, A main equipment startable indicator circuit is connected in parallel to the normally open contact SB4-1 of the main equipment start button SB4 and the coil of the contactor KM2. The main equipment startable indicator circuit includes the normally closed contact SB4-2 of the main equipment start button SB4, the normally closed contact KM2-4 of the contactor KM2, and the main equipment startable alarm device, which are connected in series.

4. A fault monitoring and indication control circuit for a power equipment with a lubricating oil pump according to claim 3, characterized in that, A main device stop indication circuit is connected in parallel to the main device start indication circuit. The main device stop indication circuit includes the normally closed contact SB4-3 of the main device start button SB4, the normally open contact KM2-5 of the contactor KM2, and the main device stop alarm device, which are connected in series.

5. A fault monitoring and indication control circuit for a power equipment with a lubricating oil pump according to any one of claims 1-2, characterized in that, A main equipment stop indication circuit is connected in parallel to the normally open contact SB4-1 of the main equipment start button SB4 and the coil of the contactor KM2. The main equipment stop indication circuit includes the normally closed contact SB4-3 of the main equipment start button SB4, the normally open contact KM2-5 of the contactor KM2, and the main equipment stop alarm device, which are connected in series.

6. A fault monitoring and indication control circuit for a power equipment with a lubricating oil pump according to any one of claims 1, 2, and 4, characterized in that, The lubricating oil pump can activate the alarm device, the lubricating oil pump can deactivate the alarm device, and the main equipment can deactivate the alarm device, which is an audible and / or visual alarm.

7. A fault monitoring and indication control circuit for a power equipment with a lubricating oil pump according to claim 3, characterized in that, The main equipment can activate an alarm device, which is an audible and / or visual alarm.

8. A fault monitoring and indication control circuit for a power equipment with a lubricating oil pump according to claim 5, characterized in that, The main equipment can stop the alarm device, which is an audible and / or visual alarm.

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