Frequency converter fault standby starting control circuit

Abstract

The utility model discloses a frequency converter fault standby starting control circuit, which comprises a first control circuit, a second control circuit, a third control circuit, a fourth control circuit, a fifth control circuit, a sixth control circuit and a seventh control circuit, the utility model has the advantages that the electric control circuit is simple and reasonable, the phenomenon of burning loss of the motor caused by the fault of the frequency converter can be reduced, the cost is saved, and the use value is high; in the maintenance process of the frequency converter, the motor can operate normally, and the production efficiency and stability are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of motor control, in particular to a frequency converter fault standby starting control circuit. Background Art

[0002] With the development of power and electronic technology, as well as the transformation of a large number of industrial basic equipment, in the field of control, more and more users have put forward higher requirements for electrical equipment. The emergence and application of frequency converters have simplified complex control, making the production process more convenient, faster and more precise. However, frequency converters, like other control devices, are bound to have faults in their applications.

[0003] The causes of internal failure of the inverter include but are not limited to overload, overvoltage, undervoltage, overheating, moisture or dust on the circuit board, poor contact, signal interference, etc. At present, after an internal failure occurs in the inverter of large heavy equipment, it cannot be restored normally in a short time, which wastes time and seriously affects production. It is very important to restore production in a short time. Utility Model Content

[0004] The utility model aims to provide a frequency converter fault standby starting control circuit.

[0005] The utility model is implemented by the following technical scheme: a frequency converter fault standby startup control circuit, which includes a first control circuit, a second control circuit, a third control circuit, a fourth control circuit, a fifth control circuit, a sixth control circuit, and a seventh control circuit;

[0006] The first control circuit includes a switch of a circuit breaker QF, fault normally closed contacts 30C-30B of a frequency converter F, a power stop button SB1, a normally open contact of an angular contactor KM2, a normally closed contact of a third contactor KM3, and a coil of the angular contactor KM2, and the normally open contact of the angular contactor KM2 is connected in parallel with the power start button SB2;

[0007] The second control circuit is connected in parallel between the power stop button SB1 of the first control circuit, the normally open contact of the angular contactor KM2, the normally closed contact of the third contactor KM3, and the coil of the angular contactor KM2;

[0008] The second control circuit includes a frequency converter stop button SB3, a frequency converter F start button SB4, and a coil of an intermediate relay KA which are arranged in series in sequence, and the frequency converter F start button SB4 is connected in parallel with a normally open contact of the intermediate relay KA;

[0009] The third control circuit is connected in parallel between the fault normally closed contacts 30C-30B of the inverter F of the first control circuit, the power stop button SB1, the normally open contact of the angular contactor KM2, the normally closed contact of the third contactor KM3, and the coil of the angular contactor KM2;

[0010] The third control circuit includes the fault normally open contacts 30A-30B of the frequency converter F, the normally closed contacts of the angular contactor KM2, the delayed disconnection contacts of the time relay KT, the coil of the third contactor KM3, and the normally closed contacts of the thermal relay FR, which are arranged in series in sequence. The fault normally open contacts 30A-30B of the frequency converter F are connected in parallel with the normally open contacts of the third contactor KM3;

[0011] A fourth control circuit is connected in parallel between the normally closed contact of the angular contactor KM2 of the third control circuit, the delayed opening contact of the time relay KT, and the coil of the third contactor KM3;

[0012] The fourth control circuit includes an indicator light HL;

[0013] A fifth control circuit is connected in parallel between the fault normally open contacts 30A-30B of the frequency converter F, the normally closed contacts of the angular contactor KM2, the delayed disconnection contacts of the time relay KT, and the coil of the third contactor KM3 of the third control circuit;

[0014] The fifth control circuit includes a power stop button SB5, a power start button SB6, and a coil of a power contactor KM1 which are sequentially arranged in series, and the power start button SB6 is connected in parallel with a normally open contact of the power contactor KM1;

[0015] The coil of the power contactor KM1 of the fifth control circuit is connected in parallel with the sixth control circuit;

[0016] The sixth control circuit includes a normally closed contact of an angular contactor KM2 and a coil of a time relay KT which are arranged in series;

[0017] The sixth control circuit is connected in parallel with the seventh control circuit;

[0018] The seventh control circuit includes a normally open contact of an angular contactor KM2, a normally closed contact of a third contactor KM3, and a coil of the angular contactor KM2 which are arranged in series in sequence. The normally open contact of the angular contactor KM2 is connected in parallel with a delayed closing normally open contact of a time relay KT.

[0019] Advantages of the utility model: simple and reasonable electrical control circuit can reduce the occurrence of motor burning caused by inverter failure, save costs and have high use value;

[0020] During the maintenance of the inverter, the motor can also operate normally, ensuring the efficiency and stability of production. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the main circuit of the motor in the utility model;

[0023] Figure 2 It is a schematic diagram of the control circuit in the utility model;

[0024] In the figure: power contactor KM1, third contactor KM3, angle contactor KM2, circuit breaker QF, power stop button SB1, power start button SB2, inverter stop button SB3, inverter F start button SB4, power stop button SB5, power start button SB6, intermediate relay KA, time relay KT, inverter F fault normally open contacts 30A-30B, inverter F fault normally closed contacts 30C-30B. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] like Figure 1-2 As shown, the inverter fault standby startup control circuit includes a first control circuit 1, a second control circuit 2, a third control circuit 3, a fourth control circuit 4, a fifth control circuit 5, a sixth control circuit 6, and a seventh control circuit 7;

[0027] The first control circuit 1 includes a switch of a circuit breaker QF, fault normally closed contacts 30C-30B of the frequency converter F, a power stop button SB1, a normally open contact of an angular contactor KM2, a normally closed contact of a third contactor KM3, and a coil of the angular contactor KM2, and the normally open contact of the angular contactor KM2 is connected in parallel with a power start button SB2;

[0028] A second control circuit 2 is connected in parallel between the power stop button SB1 of the first control circuit 1, the normally open contact of the angular contactor KM2, the normally closed contact of the third contactor KM3, and the coil of the angular contactor KM2;

[0029] The second control circuit 2 includes a frequency converter stop button SB3, a frequency converter F start button SB4, and a coil of an intermediate relay KA which are arranged in series in sequence, and the frequency converter F start button SB4 is connected in parallel with a normally open contact of the intermediate relay KA;

[0030] A third control circuit 3 is connected in parallel between the fault normally closed contacts 30C-30B of the frequency converter F of the first control circuit 1, the power stop button SB1, the normally open contact of the angle contactor KM2, the normally closed contact of the third contactor KM3, and the coil of the angle contactor KM2;

[0031] The third control circuit 3 includes the fault normally open contacts 30A-30B of the frequency converter F, the normally closed contacts of the angle contactor KM2, the delayed disconnection contacts of the time relay KT, the coil of the third contactor KM3, and the normally closed contacts of the thermal relay FR, which are sequentially arranged in series. The fault normally open contacts 30A-30B of the frequency converter F are connected in parallel with the normally open contacts of the third contactor KM3.

[0032] A fourth control circuit 4 is connected in parallel between the normally closed contact of the angular contactor KM2 of the third control circuit 3, the delayed opening contact of the time relay KT, and the coil of the third contactor KM3;

[0033] The fourth control circuit 4 includes an indicator light HL;

[0034] A fifth control circuit 5 is connected in parallel between the fault normally open contacts 30A-30B of the frequency converter F of the third control circuit 3, the normally closed contacts of the angle contactor KM2, the delayed opening contacts of the time relay KT, and the coil of the third contactor KM3;

[0035] The fifth control circuit 5 includes a power stop button SB5, a power start button SB6, a coil of a power contactor KM1, and a power start button SB6, which are sequentially connected in series, and a normally open contact of the power contactor KM1 connected in parallel;

[0036] The coil of the power contactor KM1 of the fifth control circuit 5 is connected in parallel with the sixth control circuit 6;

[0037] The sixth control circuit 6 includes a normally closed contact of an angular contactor KM2 and a coil of a time relay KT which are sequentially connected in series;

[0038] The sixth control circuit 6 is connected in parallel with a seventh control circuit 7;

[0039] The seventh control circuit 7 includes the normally open contact of the angular contactor KM2, the normally closed contact of the third contactor KM3, and the coil of the angular contactor KM2, which are arranged in series in sequence. The normally open contact of the angular contactor KM2 is connected in parallel with the delayed closing normally open contact of the time relay KT.

[0040] The specific operation process of this embodiment is as follows:

[0041] The model of inverter F is ACS510. The normally open contacts of the angular contactor KM2 and the normally open contacts of the intermediate relay KA are short-circuited between its pins run and com to start the inverter F. The normally open contacts of inverter F are 30A-30B, and the normally closed contacts of inverter F are 30C-30B.

[0042] 1. When the frequency converter F is normal, the steps to start the motor M of the electrical equipment are:

[0043] Close the switch of circuit breaker QF;

[0044] First control circuit: Press the power start button SB2, the coil of the angular contactor KM2 is energized and self-locked, and the motor M is connected in an angular state;

[0045] Second control circuit: Press the inverter start button SB4 again, the coil of the intermediate relay KA is energized and self-locked;

[0046] At this time, the normally open contact of the angle contactor KM2 in the main circuit of the motor M is closed, and the normally open contact of the intermediate relay KA is closed to connect the inverter, and the inverter starts to start the motor M to run;

[0047] When the motor M needs to stop:

[0048] Second control circuit: Press the power stop button SB1, then the coil of the angle contactor KM2 loses power, and the normally open contact of the angle contactor KM2 in the main circuit of the motor M is disconnected. Press the inverter stop button SB3, then the coil of the intermediate relay KA loses power, and the normally open contact of the intermediate relay KA in the main circuit of the motor M is disconnected, and the motor M stops normally.

[0049] 2. When the inverter has an abnormal situation, the inverter stops running:

[0050] First control circuit and second control circuit: At this time, the inverter's fault normally closed contacts 30C-30B are in the disconnected state, disconnecting the coil of the angle contactor KM2 and the coil of the intermediate relay KA;

[0051] At this time, the normally open contacts of the angular contactor KM2 and the intermediate relay KA2 in the main circuit of the motor M are in the disconnected state, and the inverter stops running;

[0052] The third control circuit: the inverter's fault normally open contacts 30A-30B are in a closed state, at which time the third contactor KM3 coil is energized and self-locked, and the motor M is connected in a star state;

[0053] Fourth control circuit: The indicator light HL starts to alarm, notifying maintenance personnel of inverter failure, and the backup star-delta system can be started;

[0054] The fifth control circuit: Press the backup system start button SB6, the power contactor KM1 coil is energized and self-locked, and the motor starts star operation;

[0055] The sixth control circuit: At this time, the coil of the time relay KT is energized and the timing starts;

[0056] The third control circuit: when the time relay KT reaches the set time, the time relay KT delays the disconnection of the contact;

[0057] Seventh control circuit: At this time, the coil of the third contactor KM3 loses power, and its normally closed point is in a closed state. At the same time, the delayed closing contact of the time relay KT is closed, the coil of the angle contactor KM2 is energized and self-locked, and the motor M runs in an angle mode;

[0058] The third control circuit: At this time, the normally closed contact of the angular contactor KM2 is disconnected, and the coil circuit of the third contactor KM3 is always in the power-off state;

[0059] The sixth control circuit: the normally closed contact of the angle contactor KM2 is disconnected, and the coil circuit of the time relay KT is always in the power-off state.

[0060] When the motor M angle type is running normally, the indicator light HL1 is still on, indicating that the inverter fault can be handled after the production is normal;

[0061] When the motor M needs to be stopped, the power stop button SB5 is pressed, so that the coil of the first relay KM1 and the coil of the second relay KM2 are both de-energized, and the motor M stops running.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. The inverter fault standby startup control circuit is characterized by: It includes a first control circuit, a second control circuit, a third control circuit, a fourth control circuit, a fifth control circuit, a sixth control circuit, and a seventh control circuit; The first control circuit includes a switch of a circuit breaker QF, fault normally closed contacts 30C-30B of a frequency converter F, a power stop button SB1, a normally open contact of an angular contactor KM2, a normally closed contact of a third contactor KM3, and a coil of the angular contactor KM2, and the normally open contact of the angular contactor KM2 is connected in parallel with a power start button SB2; The second control circuit is connected in parallel between the power stop button SB1 of the first control circuit, the normally open contact of the angular contactor KM2, the normally closed contact of the third contactor KM3, and the coil of the angular contactor KM2; The second control circuit includes a frequency converter stop button SB3, a frequency converter F start button SB4, and a coil of an intermediate relay KA which are arranged in series in sequence, and the frequency converter F start button SB4 is connected in parallel with a normally open contact of the intermediate relay KA; The third control circuit is connected in parallel between the fault normally closed contacts 30C-30B of the inverter F of the first control circuit, the power stop button SB1, the normally open contact of the angular contactor KM2, the normally closed contact of the third contactor KM3, and the coil of the angular contactor KM2; The third control circuit includes the fault normally open contacts 30A-30B of the frequency converter F, the normally closed contacts of the angular contactor KM2, the delayed disconnection contacts of the time relay KT, the coil of the third contactor KM3, and the normally closed contacts of the thermal relay FR, which are arranged in series in sequence. The fault normally open contacts 30A-30B of the frequency converter F are connected in parallel with the normally open contacts of the third contactor KM3; A fourth control circuit is connected in parallel between the normally closed contact of the angular contactor KM2 of the third control circuit, the delayed opening contact of the time relay KT, and the coil of the third contactor KM3; The fourth control circuit includes an indicator light HL; The fifth control circuit is connected in parallel between the fault normally open contacts 30A-30B of the frequency converter F, the normally closed contacts of the angular contactor KM2, the delayed disconnection contacts of the time relay KT, and the coil of the third contactor KM3 of the third control circuit; The fifth control circuit includes a power stop button SB5, a power start button SB6, and a coil of a power contactor KM1 which are sequentially arranged in series, and the power start button SB6 is connected in parallel with a normally open contact of the power contactor KM1; The coil of the power contactor KM1 of the fifth control circuit is connected in parallel with the sixth control circuit; The sixth control circuit includes a normally closed contact of an angular contactor KM2 and a coil of a time relay KT which are arranged in series; The sixth control circuit is connected in parallel with the seventh control circuit; The seventh control circuit includes a normally open contact of an angular contactor KM2, a normally closed contact of a third contactor KM3, and a coil of the angular contactor KM2 which are arranged in series in sequence. The normally open contact of the angular contactor KM2 is connected in parallel with a delayed closing normally open contact of a time relay KT.

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