Marine heater control system based on touch all-in-one machine

Abstract

The utility model discloses a marine heater control system based on touch all -in -one, including touch all -in -one PLCHMI, alternating current contactor KM1~KM5 and marine heater EH1~EH5, and the outgoing wiring from three -phase ac power supply is divided into main circuit and secondary circuit, and the main circuit is connected three -phase ac transmitter J1 and is divided into five branch circuits, and one branch circuit is connected the contact of alternating current contactor KM5 and thyristor voltage regulator SSR1 in proper order and then accesses the power input end of marine heater EH5, and after the contact of alternating current contactor KM1~KM4 is connected respectively, the power input end of marine heater EH1~EH4 is accessed respectively, and three -phase ac transmitter J1 is electrically connected with touch all -in -one PLCHMI, and thyristor voltage regulator SSR1 is electrically connected with touch all -in -one PLCHMI. The utility model discloses a touch all -in -one replaces PLC and touch -sensitive screen, and the circuit is simplified, and the original function is compatible, and the thyristor voltage regulator is introduced, and energy -conserving and flexible temperature control are realized, and three -phase ac transmitter real -time monitoring current, and the working condition of heater can be directly reflected.

Description

Technical Field

[0001] This utility model relates to the field of marine heater control technology, specifically a marine heater control system based on a touch screen all-in-one machine. Background Technology

[0002] Marine heaters, as important shipboard components, are mainly used for fuel preheating / heating, hydraulic system insulation, cooling water heating, heating systems, supplying hot water, preventing pipe freezing, cabin insulation, and hatch defrosting.

[0003] Existing marine heater control systems are mainly divided into two types:

[0004] One type is a control system with a temperature instrument as the core and AC contactors, buttons, indicator lights, etc. as actuators. It reads the current temperature and compares it with the required temperature by the temperature instrument, controls the opening and closing of the AC contactor, and thus controls the start and stop of the heater.

[0005] Another method uses a PLC from brands such as Siemens, Mitsubishi, and Xinje as the core, a touch screen as the host computer, and AC contactors and rotary switches as actuators. The PLC reads the temperature value collected by the temperature probe, compares it with the required temperature, and calculates to determine the number of heaters to be put into operation.

[0006] The disadvantage of these two control systems is that, on the one hand, using contactors as actuators will cause the contactors to operate frequently when the collected temperature is close to the set temperature, which will greatly shorten the service life of the contactors.

[0007] On the other hand, control systems centered on temperature instruments have limitations, displaying limited effective information. They typically only display the current and set temperatures and cannot display other effective information such as the heater's operating status.

[0008] On the other hand, control systems based on PLCs have complex electrical principles, resulting in long manufacturing cycles. Furthermore, due to the large size of PLCs, the control box will also be larger, thus occupying limited space on the ship. Utility Model Content

[0009] The purpose of this invention is to overcome the defects and shortcomings of the existing technology and provide a marine heater control system based on a touch screen all-in-one machine. The touch screen all-in-one machine replaces the PLC and touch screen to simplify the circuit and maintain compatibility with their original functions; a thyristor voltage regulator is introduced to achieve energy saving and flexible temperature control; and a three-phase AC transmitter is used to monitor the current in real time to intuitively reflect the working status of the heater.

[0010] To achieve the above objectives, this utility model provides the following technical solution:

[0011] A marine heater control system based on a touch screen all-in-one machine includes a touch screen all-in-one machine PLC / HMI, AC contactors KM1~KM5 and marine heaters EH1~EH5. The system is connected from a three-phase AC power supply and is divided into a main circuit and a secondary circuit. The main circuit is connected to a three-phase AC transmitter J1 and then divided into five branches. One branch is connected to the contacts of AC contactor KM5 and the thyristor voltage regulator SSR1 in sequence and then connected to the power input terminal of marine heater EH5. The other branches are connected to the contacts of AC contactors KM1~KM4 respectively and then connected to the power input terminals of marine heaters EH1~EH4 respectively.

[0012] The three-phase AC transmitter J1 is electrically connected to the touch screen PLC / HMI and is used to collect the current signal of the main circuit in real time and send it to the touch screen PLC / HMI.

[0013] The SSR1 thyristor voltage regulator is electrically connected to the touch screen PLC / HMI and is controlled by the touch screen PLC / HMI to regulate the input voltage of the marine heater EH5.

[0014] Furthermore, the model of the touch screen all-in-one PLC / HMI is AMX-HSEA-MR, and the model of the SSR1 thyristor voltage regulator is LSA-TH3P70Y.

[0015] Furthermore, the secondary circuit is connected to transformer T1 and then splits into two branches. One branch is connected to the coils of rotary switches SB1~SB5 and AC contactors KM1~KM5, wherein the coils of rotary switches SB1~SB5 and AC contactors KM1~KM5 are connected in series and then in parallel respectively. The other branch is connected to switching power supply G1. The output terminal of switching power supply G1 is connected to a power supply circuit that is connected to the power input terminal of the touch screen PLC / HMI. Switching power supply G1 is used to convert AC 220V voltage to 24V DC voltage to power the touch screen PLC / HMI.

[0016] Furthermore, a switch branch is connected to the power supply circuit, and the switch branch is connected to the coils of the manual / automatic switch SB6, the over-temperature protection switch B1, the pressure switch B2, and the contactors KA7~KA9. The manual / automatic switch SB6, the over-temperature protection switch B1, the pressure switch B2, and the coils of the contactors KA9, KA7, and KA8 are connected in series and then in parallel, respectively. The contacts of the contactors KA7~KA9 are respectively connected between the power supply circuit and the three signal input terminals I0.0, I0.1, and I0.2 of the touch screen all-in-one PLC / HMI.

[0017] Furthermore, the three current signal input terminals IN0, IN1, and IN2 of the touch screen all-in-one PLC / HMI are respectively connected to the U-phase, V-phase, and W-phase current signal output terminals of the three-phase AC transmitter J1, and are used to collect the U-phase, V-phase, and W-phase current signals output by the three-phase AC transmitter J1.

[0018] Furthermore, the two signal output terminals I0 and M2 of the touch screen all-in-one PLC / HMI are respectively connected to the 4~20mA current signal input terminal and COM terminal of the SSR1, which are used to send a 4~20mA current signal to the SSR1 and control the SSR1 to output a voltage of 0-440V.

[0019] Furthermore, a potentiometer R1 is connected between the COM terminal, the 0~5V voltage input terminal, and the +5V voltage output terminal of the SSR1 thyristor voltage regulator.

[0020] Furthermore, the two alarm signal output terminals Q1.0 and Q1.1 of the touch screen all-in-one PLC / HMI are respectively connected to a buzzer H1 and an alarm indicator HL1.

[0021] Furthermore, a temperature sensor WD1 is connected between the two signal input terminals T0+ and T0- of the touch screen PLC / HMI to collect the temperature of the heated medium in real time.

[0022] Compared with the prior art, the beneficial effects of this utility model are:

[0023] 1. This utility model adopts a touch screen all-in-one machine, replacing the existing PLC and touch screen. It is compatible with the functions of PLC and auxiliary modules and touch screen, simplifies the circuit, has a compact structure, and saves the extra space occupied by PLC and auxiliary modules.

[0024] 2. This utility model divides the marine heater control into multiple groups, and changes the actuator of one group from an AC contactor to a combination of an AC contactor and a thyristor voltage regulator. The analog signal is output through a touch screen all-in-one machine to control the output of the thyristor voltage regulator. A PID algorithm is introduced to accurately calculate the heating power required for each time period according to the temperature rise process, which can effectively save energy. The PID parameters can also be set through the touch screen all-in-one machine, allowing users to flexibly set the PID parameters according to different working conditions to achieve precise temperature control.

[0025] 3. This utility model introduces a three-phase AC transmitter to collect the current signal of the main circuit in real time and send it to the touch screen all-in-one machine. It can intuitively reflect the working status of the heater, and can also monitor whether the heater has a phase loss or other faults through current monitoring. When an alarm occurs, the heater can be disconnected from the hardware circuit, thereby effectively protecting the equipment. Attached Figure Description

[0026] Figure 1 The circuit structure principle of this utility model Figure 1 .

[0027] Figure 2 The circuit structure principle of this utility model Figure 2 . Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] See Figure 1 , 2 A marine heater control system based on a touch screen all-in-one machine includes a touch screen all-in-one machine PLC / HMI, AC contactors KM1~KM5 and marine heaters EH1~EH5. The system is connected to a three-phase AC power supply and is divided into a main circuit and a secondary circuit. The main circuit is connected to a three-phase AC transmitter J1 and then divided into five branches. One branch is connected to the contacts of AC contactor KM5 and the thyristor voltage regulator SSR1 in sequence and then connected to the power input terminal of marine heater EH5. The other branches are connected to the contacts of AC contactors KM1~KM4 respectively and then connected to the power input terminals of marine heaters EH1~EH4 respectively.

[0030] The three-phase AC transmitter J1 is electrically connected to the touch screen PLC / HMI and is used to collect the current signal of the main circuit in real time and send it to the touch screen PLC / HMI.

[0031] The SSR1 thyristor voltage regulator is electrically connected to the touch screen PLC / HMI and is controlled by the touch screen PLC / HMI to regulate the input voltage of the marine heater EH5.

[0032] In this utility model, the model of the touch screen all-in-one PLC / HMI is AMX-HSEA-MR, and the model of the SSR1 thyristor voltage regulator is LSA-TH3P70Y.

[0033] In this invention, the secondary circuit is divided into two branches after connecting to transformer T1. One branch is connected to the coils of rotary switches SB1~SB5 and AC contactors KM1~KM5. The coils of rotary switches SB1~SB5 and AC contactors KM1~KM5 are connected in series and then in parallel. The other branch is connected to a switching power supply G1. The output terminal of the switching power supply G1 is connected to a power supply circuit that is connected to the power input terminal of the touch screen PLC / HMI. The switching power supply G1 is used to convert AC 220V voltage to 24V DC voltage to power the touch screen PLC / HMI.

[0034] In this utility model, a switch branch is connected to the power supply circuit. The switch branch is connected to the coils of the manual / automatic switch SB6, the over-temperature protection switch B1, the pressure switch B2, and the contactors KA7~KA9. The coils of the manual / automatic switch SB6, the over-temperature protection switch B1, the pressure switch B2, and the contactors KA9, KA7, and KA8 are connected in series and then in parallel, respectively. The contacts of the contactors KA7~KA9 are respectively connected between the power supply circuit and the three signal input terminals I0.0, I0.1, and I0.2 of the touch screen PLC / HMI.

[0035] In this invention, the three current signal input terminals IN0, IN1, and IN2 of the touch screen all-in-one PLC / HMI are respectively connected to the U-phase, V-phase, and W-phase current signal output terminals of the three-phase AC transmitter J1, and are used to collect the U-phase, V-phase, and W-phase current signals output by the three-phase AC transmitter J1.

[0036] In this invention, the two signal output terminals I0 and M2 of the touch screen all-in-one PLC / HMI are respectively connected to the 4~20mA current signal input terminal and COM terminal of the SSR1, which are used to send a 4~20mA current signal to the SSR1 and control the SSR1 to output a 0-440V voltage.

[0037] In this invention, a potentiometer R1 is connected between the COM terminal, the 0~5V voltage input terminal and the +5V voltage output terminal of the thyristor voltage regulator SSR1.

[0038] Therefore, it can be seen that the SSR1 thyristor voltage regulator has two control methods: one is control by potentiometer R1, and the other is control by a 4-20mA signal.

[0039] When the manual / automatic switch (knob) SB6 is off, it is in automatic mode. Relay KA9 is not energized, and the contacts of relay KA9 are open. The thyristor voltage regulator SSR1 does not receive the resistance value of potentiometer R1 and can only be controlled by the 4-20mA signal from the I0 and M2 terminals of the touch screen PLC / HMI.

[0040] When the manual / automatic switch SB6 is turned on, it is in manual mode. Relay KA9 is energized and its contacts are closed. At this time, the output of the thyristor regulator SSR1 can be controlled through potentiometer R1.

[0041] In this invention, the two alarm signal output terminals Q1.0 and Q1.1 of the touch screen all-in-one PLC / HMI are respectively connected to a buzzer H1 and an alarm indicator HL1.

[0042] In this invention, a temperature sensor WD1 is connected between the two signal input terminals T0+ and T0- of the touch screen all-in-one PLC / HMI. This sensor is used to collect the current temperature of the heated medium in real time. For example, if the medium is used to heat the cylinder liner water of a ship, the temperature sensor WD1 collects the current temperature of the cylinder liner water in real time.

[0043] The present invention will be further described below with reference to the accompanying drawings:

[0044] In the main circuit, the total power of marine heaters EH1~EH5 is 80kW, which is divided into 5 groups. The power of a single group of marine heaters EH1~EH5 is 16kW. The control element of marine heaters EH1~EH5EH1~EH4 is AC contactor KM1-KM4. Marine heaters EH1~EH5EH5 are controlled by a combination of AC contactor KM5 and thyristor voltage regulator SSR1.

[0045] The main power supply of this utility model is 3P / 440V / 60Hz, which is converted to AC 220V power supply through transformer T1.

[0046] In the secondary circuit, the switching power supply G1 converts the AC 220V voltage to DC 24V voltage to power the touch screen PLC / HMI.

[0047] When the manual / automatic switch SB6 is off, it is in automatic mode, and the marine heaters EH1~EH5 are controlled by the touch screen PLC / HMI. When it is closed, it is in manual mode. At this time, the touch screen PLC / HMI receives the signal but does not participate in the operation. The marine heaters EH1~EH5 can only be controlled by the rotary switches SB1-SB5 and potentiometer R1.

[0048] Under normal circumstances, it operates in automatic mode. In extreme cases such as when the touch screen all-in-one PLC / HMI is damaged, manual mode is used for emergency situations.

[0049] Over-temperature protection switch B1 and pressure switch B2 are protective components. When the switches are open, marine heaters EH1~EH5 will not work in either manual or automatic mode, and will send an alarm signal to the touch screen PLC / HMI, where the alarm information will pop up on the touch screen. At the same time, the buzzer H1 and alarm indicator HL1 will work to issue an alarm signal.

[0050] The three-phase AC transmitter J1 acquires current signals in real time. The touch screen PLC / HMI acquires the U-phase, V-phase, and W-phase currents output by the three-phase AC transmitter J1 through the IN0, IN1, and IN2 terminals respectively, and calculates the current heating power based on the voltage and current.

[0051] Specifically, the calculation formula is as follows:

[0052] P = U-phase voltage (u) × U-phase current (I) × U-phase phase angle (cosϕ) + V-phase voltage (u) × V-phase current (I) × V-phase phase angle (cosϕ) + W-phase voltage (u) × W-phase current (I) × W-phase phase angle (cosϕ).

[0053] The current and total power of each phase are displayed on the touch screen of the PLC / HMI all-in-one machine, and the working status of marine heaters EH1~EH5 is reflected by the current and power.

[0054] Temperature sensor WD1 is connected to the T0+ and T0- terminals of the touch screen PLC / HMI to collect the current temperature of the heated medium in real time and display it on the touch screen of the touch screen PLC / HMI.

[0055] The touch screen all-in-one PLC / HMI outputs a 4~20mA signal from the I0 and M2 terminals to the SSR1 voltage regulator, controlling the output of the SSR1 so that the SSR1 outputs a voltage of 0-440V.

[0056] It should be noted that the output of the SSR1 voltage regulator is controlled by a 4-20mA signal only in automatic mode. In manual mode, the output signal of the SSR1 voltage regulator is controlled by potentiometer R1.

[0057] In automatic mode, the power output of marine heaters EH1~EH5 is calculated using a PID algorithm, the specific PID algorithm of which is as follows:

[0058] Proportional (P)

[0059] Function: Adjust the output proportionally based on the current error (the difference between the set value and the actual value).

[0060] Formula: P = Ki × e(t)

[0061] Integral term (I)

[0062] Function: By accumulating historical errors, it eliminates steady-state errors that proportional control cannot resolve.

[0063] Formula: I = Ki × ∫0te(τ)dτ

[0064] Differential term (D)

[0065] Function: To predict the trend of error change (by the rate of change of error), suppress overshoot, and improve system stability.

[0066] Formula: D = Kd × de(t) / dt

[0067] PID three-phase weighted sum

[0068] u(t)= Ki×e(t)+ Ki×∫0te(τ)dτ+ Kd ×de(t) / dt

[0069] In practical work, the calculated output value u(t) is converted into the power required for marine heaters EH1~EH5. Taking an 80kW marine heater EH1~EH5 as an example, if the actual calculation requires 50kW, then marine heaters EH1~EH3 will heat at full power, marine heater EH4 will not work, and marine heater EH5 will work at 12.5% ​​power through the SSR1 thyristor regulator. At this time, the total heating power is: P = 16 + 16 + 16 + 16 × 12.5% ​​= 50kW

[0070] In practical use, users can set PID parameter values ​​through the touch screen of the PLC / HMI on the touch screen of the all-in-one machine according to the actual working conditions on site.

[0071] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0072] Therefore, the above description is only a preferred embodiment of this application and is not intended to limit the scope of this application; that is, all equivalent modifications made in accordance with the scope of the claims of this application shall be within the protection scope of the claims of this application.

Claims

1. A marine heater control system based on a touch screen all-in-one machine, comprising a touch screen all-in-one machine PLC / HMI, AC contactors KM1~KM5 and marine heaters EH1~EH5, connected from a three-phase AC power supply, and divided into a main circuit and a secondary circuit, characterized in that: The main circuit is connected to the three-phase AC transmitter J1 and then divided into five branches. One branch is connected to the contacts of AC contactor KM5 and the thyristor voltage regulator SSR1 in sequence and then connected to the power input terminal of marine heater EH5. The other branches are connected to the contacts of AC contactors KM1~KM4 respectively and then connected to the power input terminals of marine heaters EH1~EH4 respectively. The three-phase AC transmitter J1 is electrically connected to the touch screen PLC / HMI and is used to collect the current signal of the main circuit in real time and send it to the touch screen PLC / HMI. The SSR1 thyristor voltage regulator is electrically connected to the touch screen PLC / HMI and is controlled by the touch screen PLC / HMI to regulate the input voltage of the marine heater EH5.

2. The marine heater control system based on a touch screen all-in-one machine according to claim 1, characterized in that: The model of the touch screen all-in-one PLC / HMI is AMX-HSEA-MR, and the model of the SSR1 thyristor voltage regulator is LSA-TH3P70Y.

3. A marine heater control system based on a touch screen all-in-one machine according to claim 2, characterized in that: The secondary circuit is connected to transformer T1 and then splits into two branches. One branch is connected to the coils of rotary switches SB1~SB5 and AC contactors KM1~KM5. The coils of rotary switches SB1~SB5 and AC contactors KM1~KM5 are connected in series and then in parallel. The other branch is connected to switching power supply G1. The output terminal of switching power supply G1 is connected to the power input terminal of the touch screen PLC / HMI. Switching power supply G1 is used to convert AC 220V voltage to 24V DC voltage to power the touch screen PLC / HMI.

4. A marine heater control system based on a touch screen all-in-one machine according to claim 3, characterized in that: The power supply circuit is connected to a switch branch, which is connected to the coils of a manual / automatic switch SB6, an over-temperature protection switch B1, a pressure switch B2, and contactors KA7~KA9. The coils of the manual / automatic switch SB6, the over-temperature protection switch B1, the pressure switch B2, and the contactors KA9, KA7, and KA8 are connected in series and then in parallel, respectively. The contacts of the contactors KA7~KA9 are respectively connected between the power supply circuit and the three signal input terminals I0.0, I0.1, and I0.2 of the touch screen PLC / HMI.

5. A marine heater control system based on a touch screen all-in-one machine according to claim 2, characterized in that: The three current signal input terminals IN0, IN1, and IN2 of the touch screen PLC / HMI are respectively connected to the U-phase, V-phase, and W-phase current signal output terminals of the three-phase AC transmitter J1, and are used to collect the U-phase, V-phase, and W-phase current signals output by the three-phase AC transmitter J1.

6. A marine heater control system based on a touch screen all-in-one machine according to claim 2, characterized in that: The two signal output terminals I0 and M2 of the touch screen PLC / HMI are respectively connected to the 4~20mA current signal input terminal and COM terminal of the SSR1, which are used to send a 4~20mA current signal to the SSR1 and control the SSR1 to output a voltage of 0-440V.

7. A marine heater control system based on a touch screen all-in-one machine according to claim 6, characterized in that: A potentiometer R1 is connected between the COM terminal, the 0~5V voltage input terminal and the +5V voltage output terminal of the SSR1 thyristor voltage regulator.

8. A marine heater control system based on a touch screen all-in-one machine according to claim 2, characterized in that: The two alarm signal output terminals Q1.0 and Q1.1 of the touch screen PLC / HMI are respectively connected to the buzzer H1 and the alarm indicator HL1.

9. A marine heater control system based on a touch screen all-in-one machine according to claim 2, characterized in that: A temperature sensor WD1 is connected between the two signal input terminals T0+ and T0- of the touch screen PLC / HMI to collect the temperature of the heated medium in real time.

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