CRH1A motor train unit air conditioner starting switch and motor train unit air conditioner starting system

Abstract

The utility model relates to the field of motor train unit interior air conditioner control, in particular to a CRH1A motor train unit air conditioner starting switch and a motor train unit air conditioner starting system. Comprising a switch panel, a P8 connector, a P4 connector, a P5 connector and a first air conditioner switch group. The first air conditioner switch group comprises first, second, third and fourth switches; the first switch is connected with the P8.A3 pin, the second end of the first switch is connected with the P4.A7 pin and the P4.B7 pin, the wire inlet end of the third switch is connected with the P8.A3 pin, and the normally open wire outlet end of the third switch is connected with the P4.B1 pin; the normally closed wire outlet end of the third switch is connected with the second switch, the second end of the second switch is connected with the P5.A6 pin, the first end of the fourth switch is connected with the P8.A3 pin, and the second end of the fourth switch is connected with the P4.B2 pin and the P4.A1 pin of the P4 connector. The operation of the air conditioner can be manually recovered, and the operation is simple.

Description

TECHNICAL FIELD

[0001] The application relates to a CRH1A motor train unit air conditioner starting switch and a motor train unit air conditioner starting system. BACKGROUND

[0002] The description in this section only provides background information related to the present disclosure and does not constitute prior art. As an important part of a motor train unit, an air conditioner system can ensure that passengers can have a comfortable ride in various climate conditions. The operation of a CRH1A motor train unit air conditioner system is controlled by a control panel. When the on-line control panel fails, the air conditioner system cannot work. In the absence of professional technicians to forcibly operate the air conditioner through software, the overall operation quality of the train unit will be directly affected. SUMMARY

[0003] Therefore, the application provides a CRH1A motor train unit air conditioner starting switch and a motor train unit air conditioner starting system, which can manually restore the operation of the air conditioner and is simple to operate.

[0004] In order to achieve the above purpose, the application realizes the following technical scheme:

[0005] A CRH1A motor train set air conditioner starting switch, characterized in that: comprising a switch panel and P8 connector, P4 connector and P5 connector capable of being connected with FPC24 air conditioner control unit; the switch panel is provided with a first air conditioner switch group, the first air conditioner switch group comprises a first switch, a second switch, a third switch and a fourth switch; the P8.A3 pin of the P8 connector is used to connect the FPC24 air conditioner control unit to obtain power from the FPC24 air conditioner control unit; the first end of the first switch is connected with the P8.A3 pin of the P8 connector, the second end of the first switch is connected with the P4.A7 pin and the P4.B7 pin of the P4 connector respectively, when the first switch is pressed, the P4.A7 pin and the P8.A3 pin of the P8 connector, the P4.B7 pin and the P8.A3 pin of the P8 connector are respectively turned on, the P4.A7 pin is used to be connected with the first air supply fan high-speed starting control signal input port DO-9 port of the FPC24 air conditioner control unit, and the P4.B7 pin is used to be connected with the first air supply fan low-speed starting control signal input port DO-10 port of the FPC24 air conditioner control unit; the third switch is a double-control switch, the line-in end of the third switch is connected with the P8.A3 pin of the P8 connector, and the normally open line-out end of the third switch is connected with the P4.B1 pin of the P4 connector; the normally closed line-out end of the third switch is connected with the first end of the second switch, the second end of the second switch is connected with the P5.A6 pin of the P5 connector, when the third switch is pressed, the P4.B1 pin and the P8.A3 pin of the P8 connector are turned on, the third switch is reset and the second switch is pressed, and the P5.A6 pin and the P8.A3 pin of the P8 connector are turned on; the P4.B1 pin is used to be connected with the first condenser fan high-speed starting control signal input port DO-2 port of the FPC24 air conditioner control unit, and the P5.A6 pin is used to be connected with the first condenser fan low-speed starting control signal input port DO-19 port of the FPC24 air conditioner control unit; the first end of the fourth switch is connected with the P8.A3 pin, and the second end is connected with the P4.B2 pin and the P4.A1 pin of the P4 connector respectively, when the fourth switch is pressed, the P4.B2 pin and the P8.A3 pin of the P8 connector, and the P4.A1 pin and the P8.A3 pin of the P8 connector are respectively turned on, the P4.A1 pin is used to be connected with the starting control signal input port DO-1 port of the first compressor of the FPC24 air conditioner control unit, and the P4.B2 pin is used to be connected with the first electromagnetic valve starting signal input port DO-4 port of the FPC24 air conditioner control unit.

[0006] The CRH1A motor train unit air conditioner starting switch disclosed by the application realizes manual control of the air conditioner system through the switch docking control panel. Meanwhile, protection design is made for possible misoperation during starting: first, the air conditioner compressor and the liquid path valve are docked to form synchronous control, avoiding high pressure in the pipeline caused by hard misoperation. Second, interlocking control is made between the low speed of the condensing fan and the high speed of the condensing fan in control, avoiding the problem of the high and low speed contactors of the condensing fan switching back and forth after the intelligent starting switch is suddenly powered on due to position error. Third, the control switch direction of the air supply fan is optimized, effectively avoiding the problem of no high speed mode of the air supply fan during forced starting.

[0007] In some embodiments, a second air conditioner switch group is arranged on the switch panel, and the second air conditioner switch group comprises a fifth switch, a sixth switch, a seventh switch and an eighth switch. The first end of the fifth switch is connected with the P8.A3 pin of the P8 connector, and the second end of the fifth switch is respectively connected with the P4.A8 pin and the P4.B8 pin of the P4 connector. When the fifth switch is pressed, the P4.A8 pin and the P8.A3 pin of the P8 connector, and the P4.B8 pin and the P8.A3 pin of the P8 connector are respectively turned on. The P4.A8 pin is used to be connected with the second air supply fan high speed starting control signal input port DO-11 port of the FPC24 air conditioner control unit, and the P4.B8 pin is used to be connected with the second air supply fan low speed starting control signal input port DO-12 port of the FPC24 air conditioner control unit. The seventh switch is a double control switch. The incoming line end of the seventh switch is connected with the P8.A3 pin, and the normally open outgoing line end of the seventh switch is connected with the P4.A2 pin of the P4 connector. The normally closed outgoing line end of the seventh switch is connected with the first end of the fifth switch, and the second end of the fifth switch is connected with the P5.B6 pin of the P5 connector. When the seventh switch is pressed, the P4.A2 pin and the P8.A3 pin of the P8 connector are turned on. When the seventh switch is reset and the sixth switch is pressed, the P5.B6 pin and the P8.A3 pin of the P8 connector are turned on. The P4.A2 pin is used to be connected with the second condensing fan high speed starting control signal input port DO-3 port of the FPC24 air conditioner control unit, and the P5.B6 pin is used to be connected with the second condensing fan low speed starting control signal input port DO-20 port of the FPC24 air conditioner control unit. The first end of the eighth switch is connected with the P8.A3 pin, and the second end of the eighth switch is respectively connected with the P5.A7 pin and the P5.A4 pin of the P5 connector. When the eighth switch is pressed, the P5.A7 pin and the P8.A3 pin of the P8 connector, and the P5.A4 pin and the P8.A3 pin of the P8 connector are respectively turned on. The P5.A7 pin is used to be connected with the starting control signal input port DO-22 port of the second compressor of the FPC24 air conditioner control unit, and the P5.A4 pin is used to be connected with the second electromagnetic valve starting signal input port DO-5 port of the FPC24 air conditioner control unit.

[0008] The application also provides a motor train unit air conditioner starting system, characterized in that it comprises the motor train unit air conditioner starting switch and the FPC24 air conditioner control unit, and the FPC24 air conditioner control unit comprises a first air blower control circuit, a first condenser blower control circuit and a first compressor control circuit.

[0009] The first air blower control circuit comprises a contactor KA6, a contactor KM15, a contactor KM14, a first air blower, a first air blower low-speed starting control switch group for controlling the low-speed starting of the first air blower and a first air blower high-speed starting control switch group for controlling the high-speed starting of the first air blower; the coil A1 end of the contactor KA6 is connected with the first air blower low-speed starting control signal input port DO-10 of the FPC24 air conditioner control unit, the coil A2 end of the contactor KA6 is connected with the 21 end of the normally closed contact 21-22 of the contactor KM14, the 22 end of the normally closed contact 21-22 of the contactor KM14 is connected with the coil A1 end of the contactor KM15, the coil of the contactor KM15 is also connected with the first air blower low-speed starting control switch group so as to control the on-off of the first air blower low-speed starting control switch group, so that when the coil of the contactor KM15 is electrified, the first air blower low-speed starting control switch group is closed to make the first air blower rotate at low speed; the 14 end of the normally open contact 14-11 of the contactor KA6 is connected with the first air blower high-speed starting control signal input port DO-9 of the FPC24 air conditioner control unit, the 11 end of the normally open contact 14-11 of the contactor KA6 is connected with the coil A1 end of the contactor KM14, the coil of the contactor KA6 is also connected with the normally open contact 14-11 of the contactor KA6 so as to control the on-off of the normally open contact 14-11 of the contactor KA6, so that when the coil of the contactor KA6 is electrified, the normally open contact 14-11 of the contactor KA6 is closed; the coil of the contactor KM14 is also connected with the first air blower high-speed starting control switch group and the normally closed contact 21-22 of the contactor KM14 so as to control the on-off of the first air blower high-speed starting control switch group and the normally closed contact 21-22 of the contactor KM14, so that when the coil of the contactor KM14 is electrified, the first air blower high-speed starting control switch group is closed to make the first air blower rotate at high speed, and the normally closed contact 21-22 of the contactor KM14 is disconnected.

[0010] The first condensing fan control circuit comprises a contactor KM12, a contactor KM13, a first condensing fan, a first condensing fan low-speed starting control switch group for controlling the low-speed starting of the first condensing fan, and a first condensing fan high-speed starting control switch group for controlling the high-speed starting of the first condensing fan; the 21 end of the normally closed contact 21-22 of the contactor KM13 is connected with the first condensing fan high-speed starting control signal input port DO-2 of the FPC 24 air conditioner control unit, the 22 end of the normally closed contact 21-22 of the contactor KM13 is connected with the coil A1 end of the contactor KM12, the 31 end of the normally closed contact 31-32 of the contactor KM12 is connected with the first condensing fan low-speed starting control signal input port DO-19 of the FPC 24 air conditioner control unit, the 32 end of the normally closed contact 31-32 of the contactor KM12 is connected with the coil A1 end of the contactor KM13, the coil of the contactor KM13 is further connected with the first condensing fan low-speed starting control switch group and the normally closed contact 21-22 of the contactor KM13 to control the on-off of each of them, when the coil of the contactor KM13 is electrified, the first condensing fan low-speed starting control switch group is closed to make the first condensing fan rotate at low speed, and the normally closed contact 21-22 of the contactor KM13 is disconnected; the coil of the contactor KM12 is further connected with the first condensing fan high-speed starting control switch group and the normally closed contact 31-32 of the contactor KM12 to control the on-off of each of them, when the coil of the contactor KM13 is electrified, the first condensing fan high-speed starting control switch group is closed to make the first condensing fan rotate at high speed, and the normally closed contact 31-32 of the contactor KM12 is disconnected.

[0011] The first compressor control circuit comprises a contactor KM11, a first compressor, a first compressor starting control switch group for controlling the starting of the first compressor, and a first electromagnetic valve 1-1 for controlling the on-off of the liquid circuit of the first compressor; the coil A1 end of the contactor KM11 is connected with the starting control signal input port DO-1 of the first compressor of the FPC 24 air conditioner control unit, the coil of the contactor KM11 is further connected with the first compressor starting control switch group, when the coil of the contactor KM11 is electrified, the first compressor starting control switch group is closed to make the first compressor start; the first electromagnetic valve 1-1 is connected with the first electromagnetic valve starting signal input port DO-4 of the FPC 24 air conditioner control unit, the first electromagnetic valve starting signal input port DO-4 of the FPC 24 air conditioner control unit outputs a signal to control the switch of the first electromagnetic valve 1-1.

[0012] In some embodiments, the FPC 24 air conditioner control unit further comprises a second supply fan control circuit, a second condensing fan control circuit, and a second compressor control circuit.

[0013] The second air blower control circuit comprises a contactor KA7, a contactor KM17, a contactor KM16, a second air blower, a second air blower low-speed start control switch group for controlling low-speed start of the second air blower, and a second air blower high-speed start control switch group for controlling high-speed start of the second air blower; the coil A1 end of the contactor KA7 is connected with the second air blower low-speed start control signal input port DO-12 of the FPC24 air conditioner control unit, the coil A2 end of the contactor KA7 is connected with the 21 end of the normally closed contact 21-22 of the contactor KM16, the 22 end of the normally closed contact 21-22 of the contactor KM16 is connected with the coil A1 end of the contactor KM17, the coil of the contactor KM17 is further connected with the second air blower low-speed start control switch group to control the on-off of the second air blower low-speed start control switch group, so that when the coil of the contactor KM17 is electrified, the second air blower low-speed start control switch group is closed to make the second air blower rotate at low speed; the 14 end of the normally open contact 14-11 of the contactor KA7 is connected with the second air blower high-speed start control signal input port DO-17 of the FPC24 air conditioner control unit, the 11 end of the normally open contact 14-11 of the contactor KA7 is connected with the coil A1 end of the contactor KM16, the coil of the contactor KA7 is further connected with the normally open contact 14-11 of the contactor KA7 to control the on-off of the normally open contact 14-11 of the contactor KA7, so that when the coil of the contactor KA7 is electrified, the normally open contact 14-11 of the contactor KA7 is closed; the coil of the contactor KM16 is further connected with the second air blower high-speed start control switch group and the normally closed contact 21-22 of the contactor KM16 to control the on-off of the second air blower high-speed start control switch group and the normally closed contact 21-22 of the contactor KM16, so that when the coil of the contactor KM16 is electrified, the second air blower high-speed start control switch group is closed to make the second air blower rotate at high speed, and the normally closed contact 21-22 of the contactor KM16 is disconnected;

[0014] The second condensing fan control circuit comprises a contactor KM22, a contactor KM23, a second condensing fan, a second condensing fan low-speed starting control switch group for controlling the low-speed starting of the second condensing fan, and a second condensing fan high-speed starting control switch group for controlling the high-speed starting of the second condensing fan; the 21 end of the normally closed contact 21-22 of the contactor KM23 is connected with the second condensing fan high-speed starting control signal input port DO-3 of the FPC24 air conditioner control unit, the 22 end of the normally closed contact 21-22 of the contactor KM23 is connected with the coil A1 end of the contactor KM22, the 21 end of the normally closed contact 21-22 of the contactor KM22 is connected with the second condensing fan low-speed starting control signal input port DO-20 of the FPC24 air conditioner control unit, the 22 end of the normally closed contact 21-22 of the contactor KM22 is connected with the coil A1 end of the contactor KM23, the coil of the contactor KM23 is further connected with the second condensing fan low-speed starting control switch group and the normally closed contact 21-22 of the contactor KM23 so as to control the on-off of each of them, when the coil of the contactor KM23 is electrified, the second condensing fan low-speed starting control switch group is closed to make the second condensing fan rotate at low speed, and the normally closed contact 21-22 of the contactor KM23 is disconnected; the coil of the contactor KM22 is further connected with the second condensing fan high-speed starting control switch group and the normally closed contact 21-22 of the contactor KM22 so as to control the on-off of each of them, when the coil of the contactor KM23 is electrified, the second condensing fan high-speed starting control switch group is closed to make the second condensing fan rotate at high speed, and the normally closed contact 21-22 of the contactor KM22 is disconnected.

[0015] The second compressor control circuit comprises a contactor KM21, a second compressor, a second compressor starting control switch group for controlling the starting of the second compressor, and a second electromagnetic valve 2-1 for controlling the on-off of the liquid circuit of the second compressor; the coil A1 end of the contactor KM21 is connected with the starting control signal input port DO-17 of the second compressor of the FPC24 air conditioner control unit, the coil of the contactor KM21 is further connected with the second compressor starting control switch group, the coil of the contactor KM21 is electrified, the second compressor starting control switch group is closed to make the second compressor start; the second electromagnetic valve 2-1 is connected with the second electromagnetic valve starting signal input port DO-22 of the FPC24 air conditioner control unit, and the first electromagnetic valve starting signal input port DO-22 of the FPC24 air conditioner control unit outputs a signal to control the switch of the second electromagnetic valve 2-1.

[0016] From the above technical solution, the present application has at least the following advantages and positive effects:

[0017] 1. The problem of air conditioning system control computer failure leading to air conditioning system failure is solved, and the adverse effects caused by air conditioning failure in high temperature weather in summer are avoided, ensuring the safety of passengers traveling.

[0018] 2. The application can effectively shorten the emergency start-up time of the air conditioning system, improve the operation efficiency, and reduce the difficulty of equipment start-up. One-key start-up does not require software foundation, is simple and easy to understand, and the mechanic can operate quickly, the success rate of start-up is greatly improved, and the fault handling time is shortened. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The circuit diagram of the CRH1A motor train unit air conditioning start switch in the embodiment of the application;

[0020] Figure 2 The circuit of the embodiment of the application Figure 1 ;

[0021] Figure 3 The circuit of the embodiment of the application Figure 2 ;

[0022] Figure 4 The circuit of the embodiment of the application Figure 4 ;

[0023] Figure 5 The circuit of the embodiment of the application Figure 5 ;

[0024] Figure 6 The circuit of the embodiment of the application Figure 6 ;

[0025] Figure 7 The structure diagram of the CRH1A motor train unit air conditioning start switch in the embodiment of the application.

[0026] Label explanation: 10, switch panel; 20, first air conditioning switch group; 30, second air conditioning switch group. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the application clearer, the application will be further described in detail below with reference to the drawings. The terms used in the embodiment part of the application are only used to explain the specific embodiments of the application, and are not intended to limit the application.

[0028] The CRH1A motor train unit air conditioner is controlled by a digital controller FPC24 to control the operation of the carriage air conditioner. If the FPC24 controller fails, the carriage air conditioner will not work normally, affecting passenger transportation. At this time, the CRH1A motor train unit air conditioning system intelligent start switch configured by the train set can be used to restore the air conditioning operation.

[0029] Referring toFigures 1 to 7 The embodiment of the application provides a CRH1A motor train unit air conditioner starting system, which is characterized by comprising a motor train unit air conditioner starting switch and an FPC24 air conditioner control unit, and the FPC24 air conditioner control unit comprises a first air blower control circuit, a first condenser blower control circuit, a first compressor control circuit, a second air blower control circuit, a second condenser blower control circuit and a second compressor control circuit.

[0030] The first air blower control circuit comprises a contactor KA6, a contactor KM15, a contactor KM14 and a first air blower. The coil A1 end of the contactor KA6 is connected with the DO-10 port, the coil A2 end of the contactor KA6 is connected with the 21 end of the normally closed contact 21-22 of the contactor KM14, the 22 end of the normally closed contact 21-22 of the contactor KM14 is connected with the coil A1 end of the contactor KM15, the coil of the contactor KM15 is further connected with the first air blower, so that the coil of the contactor KM15 is electrified, and the first air blower rotates at a low speed; the 14 end of the normally open contact 14-11 of the contactor KA6 is connected with the DO-9 port, the 11 end of the normally open contact 14-11 of the contactor KA6 is connected with the coil A1 end of the contactor KM14, the coil of the contactor KA6 is further connected with the normally open contact 14-11 of the contactor KA6, so that the coil of the contactor KA6 is electrified, and the normally open contact 14-11 of the contactor KA6 is closed; the coil of the contactor KM14 is further connected with the first air blower and the normally closed contact 21-22 of the contactor KM14, so that the coil of the contactor KM14 is electrified, and the first air blower rotates at a high speed; the normally closed contact 21-22 of the contactor KM14 is disconnected;

[0031] The first condenser blower control circuit comprises a contactor KM12, a contactor KM13 and a first condenser blower. The 21 end of the normally closed contact 21-22 of the contactor KM13 is connected with the DO-2 port, the 22 end of the normally closed contact 21-22 of the contactor KM13 is connected with the coil A1 end of the contactor KM12, the 31 end of the normally closed contact 31-32 of the contactor KM12 is connected with the DO-19 port, the 32 end of the normally closed contact 31-32 of the contactor KM12 is connected with the coil A1 end of the contactor KM13, the coil of the contactor KM13 is further connected with the first condenser blower and the normally closed contact 21-22 of the contactor KM13, the coil of the contactor KM13 is electrified, the first condenser blower rotates at a low speed, the normally closed contact 21-22 of the contactor KM13 is disconnected, the coil of the contactor KM12 is further connected with the first condenser blower and the normally closed contact 31-32 of the contactor KM12, the coil of the contactor KM13 is electrified, the first condenser blower rotates at a high speed, and the normally closed contact 31-32 of the contactor KM12 is disconnected;

[0032] The first compressor control circuit comprises a contactor KM11, a first compressor and a first electromagnetic valve 1-1. The coil A1 of the contactor KM11 is connected with the DO-1 port, the coil of the contactor KM11 is also connected with the first compressor, the coil of the contactor KM11 is electrified, and the first compressor is aerodynamic. The first electromagnetic valve 1-1 is connected with the DO-4 port, and the DO-4 port outputs a signal to control the first electromagnetic valve 1-1 switch.

[0033] The second air supply fan control circuit comprises a contactor KA7, a contactor KM17, a contactor KM16 and a second air supply fan. The coil A1 of the contactor KA7 is connected with the DO-12 port, the coil A2 of the contactor KA7 is connected with the 21 end of the normally closed contact 21-22 of the contactor KM16, the 22 end of the normally closed contact 21-22 of the contactor KM16 is connected with the coil A1 of the contactor KM17, the coil of the contactor KM17 is also connected with the second air supply fan, so that the coil of the contactor KM17 is electrified, and the second air supply fan rotates at a low speed. The 14 end of the normally open contact 14-11 of the contactor KA7 is connected with the DO-17 port, the 11 end of the normally open contact 14-11 of the contactor KA7 is connected with the coil A1 of the contactor KM16, the coil of the contactor KA7 is also connected with the normally open contact 14-11 of the contactor KA7, so that the coil of the contactor KA7 is electrified, and the normally open contact 14-11 of the contactor KA7 is closed. The coil of the contactor KM16 is also connected with the second air supply fan and the normally closed contact 21-22 of the contactor KM16, so that the coil of the contactor KM16 is electrified, and the second air supply fan rotates at a high speed. The normally closed contact 21-22 of the contactor KM16 is disconnected.

[0034] The second condenser fan control circuit comprises a contactor KM22, a contactor KM23 and a second condenser fan. The 21 end of the normally closed contact 21-22 of the contactor KM23 is connected with the DO-3 port, the 22 end of the normally closed contact 21-22 of the contactor KM23 is connected with the coil A1 of the contactor KM22, the 21 end of the normally closed contact 21-22 of the contactor KM22 is connected with the DO-20 port, the 22 end of the normally closed contact 21-22 of the contactor KM22 is connected with the coil A1 of the contactor KM23, the coil of the contactor KM23 is also connected with the second condenser fan and the normally closed contact 21-22 of the contactor KM23, the coil of the contactor KM23 is electrified, the second condenser fan rotates at a low speed, the normally closed contact 21-22 of the contactor KM23 is disconnected, the coil of the contactor KM22 is also connected with the second condenser fan and the normally closed contact 21-22 of the contactor KM22, the coil of the contactor KM23 is electrified, the second condenser fan rotates at a high speed, and the normally closed contact 21-22 of the contactor KM22 is disconnected.

[0035] The second compressor control circuit comprises a contactor KM21, a second compressor and a second electromagnetic valve 2-1, the coil A1 end of the contactor KM21 is connected with the DO-17 port, the coil of the contactor KM21 is also connected with the second compressor, the coil of the contactor KM21 is electrified, and the second compressor is aerodynamic; the second electromagnetic valve 2-1 is connected with the DO-22 port, and the DO-22 port outputs a signal to control the second electromagnetic valve 2-1 switch.

[0036] The motor train unit air conditioner starting switch comprises a switch panel 10, a P8 connector, a P4 connector and a P5 connector which can be connected with an FPC24 air conditioner control unit; a first air conditioner switch group 20 is arranged on the switch panel, and the first air conditioner switch group comprises a first switch, a second switch, a third switch and a fourth switch;

[0037] The P8.A3 pin of the P8 connector is connected with the FPC24 air conditioner control unit and obtains electricity from the FPC24 air conditioner control unit; the first end of the first switch is connected with the P8.A3 pin, the second end of the first switch is respectively connected with the P4.A7 pin and the P4.B7 pin of the P4 connector, the P4.A7 pin and the P4.B7 pin are conducted when the first switch is pressed, the P4.A7 pin is used for being connected with a DO-9 port of the FPC24 air conditioner control unit, and the P4.B7 pin is used for being connected with a DO-10 port of the FPC24 air conditioner control unit; the third switch is a double-control switch, the incoming line end of the third switch is connected with the P8.A3 pin, and the normally open outgoing line end of the third switch is connected with the P4.B1 pin of the P4 connector; the normally closed outgoing line end of the third switch is connected with the first end of the second switch, the second end of the second switch is connected with the P5.A6 pin of the P5 connector, the P4.B1 pin is conducted when the third switch is pressed, and the P5.A6 pin is conducted when the second switch is pressed by the reset of the third switch; the P4.B1 pin is used for being connected with a DO-2 port of the FPC24 air conditioner control unit, and the P5.A6 pin is used for being connected with a DO-19 port of the FPC24 air conditioner control unit; the first end of the fourth switch is connected with the P8.A3 pin, and the second end of the fourth switch is respectively connected with the P4.B2 pin and the P4.A1 pin of the P4 connector, the P4.B2 pin and the P4.A1 pin are both conducted when the fourth switch is pressed, the P4.A1 pin is used for being connected with a DO-1 port of the FPC24 air conditioner control unit, and the P4.B2 pin is used for being connected with a DO-4 port of the FPC24 air conditioner control unit.

[0038] A second air conditioner switch group 30 is arranged on the switch panel, and the second air conditioner switch group comprises a fifth switch, a sixth switch, a seventh switch and an eighth switch;

[0039] The first end of the fifth switch is connected with P8.A3 pin, and the second end of the fifth switch is connected with P4.A8 pin and P4.B8 pin of P4 connector respectively. When the fifth switch is pressed, P4.A8 pin and P4.B8 pin are conducted, P4.A8 pin is used to be connected with DO-11 port of FPC24 air conditioner control unit, and P4.B8 pin is used to be connected with DO-12 port of FPC24 air conditioner control unit; the seventh switch is a double control switch, the incoming line end of the seventh switch is connected with P8.A3 pin, and the normally open outgoing line end of the seventh switch is connected with P4.A2 pin of P4 connector; the normally closed outgoing line end of the seventh switch is connected with the first end of the fifth switch, and the second end of the fifth switch is connected with P5.B6 pin of P5 connector. When the seventh switch is pressed, P4.A2 pin is conducted, and when the seventh switch is reset, P5.B6 pin is conducted; P4.A2 pin is used to be connected with DO-3 port of FPC24 air conditioner control unit, and P5.B6 pin is used to be connected with DO-20 port of FPC24 air conditioner control unit; the first end of the eighth switch is connected with P8.A3 pin, and the second end of the eighth switch is connected with P5.A7 pin and P5.A4 pin of P5 connector respectively. When the eighth switch is pressed, P5.A7 pin and P5.A4 pin are conducted, P5.A7 pin is used to be connected with DO-22 port of FPC24 air conditioner control unit, and P5.A4 pin is used to be connected with DO-5 port of FPC24 air conditioner control unit.

[0040] The motor train unit air conditioner starting switch realizes manual control of the air conditioner system through the switch docking control board. At the same time, protection design is made for possible misoperation behaviors during starting: first, the air conditioner compressor and the liquid circuit valve are docked to form synchronous control, avoiding the problem of high pressure in the pipeline caused by hard misoperation. Second, interlocking control is made for the low speed of the condensing fan and the high speed of the condensing fan in control, avoiding the problem of the high and low speed contactors of the condensing fan switching back and forth after the intelligent starting switch is suddenly powered on due to position error. Third, the control switch direction of the supply fan is optimized, effectively avoiding the problem of no high speed mode of the supply fan during forced starting.

[0041] The working process and use method of the CRH1A motor train unit air conditioner starting system in the above embodiment are briefly described as follows:

[0042] Figure 1 The first switch ① connects P4.A7 and P4.B7. As shown in the circuit diagram Figure 2 P4.A7 starts the high speed of the supply fan 1 through the control contactor KM14, and P4.B7 starts the low speed of the supply fan 1 through the control contactor KM15. The first switch ① realizes the high / low speed operation control of the supply fan 1 (the first fan) through the linkage Figure 2 of DO-9 and DO-9 of the FPC24 controller. As shown in the circuit diagram Figure 2Analysis, the fan 1 high-speed start by the fan 1 low-speed control, because KA6 14-11 (fan high-speed) is normally open contact, 22-21 (fan low-speed) is normally closed contact, when P4.A7 and P4.B7 input signal, fan 1 can only start low-speed first, KA6 coil at this time, the contact 14-11 is closed, the contact 22-21 is disconnected, that is, the fan 1 from low-speed to high-speed at this time.

[0043] Figure 1 The low-speed condensing switch ② (second switch) is connected to P5.A6. From the circuit diagram Figure 3 It can be seen that P5.A6 starts the condensing fan 1 (first condensing fan) low-speed by controlling the contactor KM13. The condensing low-speed switch ② controls the condensing fan 1 low-speed operation through the link Figure 3 In the FPC24 controller, DO-19 is used to realize the control of the condensing fan 1 low-speed operation. From the circuit diagram Figure 3 Analysis, when the condensing fan 1 low-speed starts, KM13 coil is electrified, normally closed contact 21-22 (in series in the high-speed loop of the condensing fan 1) is disconnected, that is, the high-speed of the condensing fan 1 cannot start at this time.

[0044] Figure 1 The high-speed condensing switch ③ (third switch) is connected to P4.B1. From the circuit diagram Figure 3 It can be seen that P4.B1 starts the condensing fan 1 high-speed by controlling the contactor KM12. The condensing high-speed switch ③ controls the condensing fan 1 high-speed operation through the link Figure 3 In the FPC24 controller, DO-2 is used to realize the control of the condensing fan 1 high-speed operation. From the circuit diagram Figure 3 Analysis, when the condensing fan 1 high-speed starts, KM12 coil is electrified, normally closed contact 31-32 (in series in the low-speed loop of the condensing fan 1) is disconnected, that is, the low-speed of the condensing fan 1 cannot start at this time.

[0045] Figure 1 The compressor + liquid path valve switch ④ (fourth switch) is connected to P4.A1 and P4.B2. From the circuit diagram Figure 3 It can be seen that P4.A1 starts the compressor 1 (first compressor) by controlling the contactor KM11; from the circuit diagram Figure 6 It can be seen that P4.B2 controls the first electromagnetic valve 1-1 (liquid path valve 1). The compressor + liquid path valve switch ④ controls the compressor 1 operation through the link Figure 3 In the FPC24 controller, DO-1 is used to realize the control of the compressor 1 operation; at the same time, through the link Figure 6 In the FPC24 controller, DO-4 is used to realize the control of the liquid path valve 1 switch.

[0046] Figure 1 The fan switch ⑤ (fifth switch) is connected to P4.A8 and P4.B8. From the circuit diagram Figure 5It can be seen that P4.A8 starts the blower 2 (second blower) at high speed by controlling contactor KM16; P4.B8 starts the blower 2 at low speed by controlling contactor KM17. The blower switch ⑤ is connected via... Figure 5 The FPC24 controller's DO-11 and DO-12 pins control the high / low speed operation of blower 2. Figure 5 Analysis shows that the high-speed start-up of blower 2 is controlled by the low-speed start-up of blower 2. Since KA7's 14-11 (high-speed blower) is a normally open contact and 22-21 (low-speed blower) is a normally closed contact, when P4.A8 and P4.B8 input signals, blower 2 can only start at low speed first. At this time, the KA7 coil is energized, contact 14-11 closes and contact 22-21 opens, that is, blower 2 switches from low speed to high speed.

[0047] Figure 1 The low-speed switch for medium-condensation (sixth switch) is connected to P5.B6. (See circuit diagram.) Figure 4 It can be seen that P5.B6 starts the condenser fan 2 (second condenser fan) at low speed by controlling contactor KM23. The condenser low-speed switch ⑥ is connected via... Figure 4 The DO-20 component of the FPC24 controller is used to control the low-speed operation of condenser fan 2. Figure 4 Analysis shows that when the condenser fan 2 starts at low speed, the KM23 coil is energized, and the normally closed contacts 21-22 (connected in series in the high-speed circuit of the condenser fan 2) open, meaning that the condenser fan 2 cannot start at high speed at this time.

[0048] Figure 1 The high-speed switch ⑦ (seventh switch) for medium-condensation is connected to P4.A2. (From the circuit diagram...) Figure 4 It can be seen that P4.A2 starts the high-speed condenser fan 2 by controlling contactor KM22. The high-speed condenser switch ⑦ is connected via... Figure 4 The DO-3 module in the FPC24 controller is used to control the high-speed operation of condenser fan 2. (The rest of the text appears to be a fragment and requires further context for accurate translation.) Figure 4 Analysis shows that when the condenser fan 2 starts at high speed, the KM22 coil is energized, and the normally closed contacts 21-22 (connected in series in the low-speed circuit of the condenser fan 2) open, meaning that the condenser fan 2 cannot start at low speed at this time.

[0049] Figure 1 The compressor + liquid circuit valve switch ⑧ (eighth switch) connects P5.A7 and P5.A4. (See circuit diagram) Figure 4 It can be seen that P5.A4 starts compressor 2 (the second compressor) by controlling contactor KM21; according to the circuit diagram Figure 6 It can be seen that P5.A7 controls the second solenoid valve 2-1 (liquid circuit valve 2). The compressor + liquid circuit valve switch ⑧ is connected via... Figure 4 The DO-17 in the FPC24 controller controls the operation of compressor 2; it also connects to... Figure 6The FPC24 controller controls the opening and closing of the second electromagnetic valve 2-1 through the DO-22.

[0050] The operation procedure is as follows:

[0051] Turn the air conditioner knob to "0" position, and disconnect the air conditioner distribution cabinet QF14 (110V power supply) air break.

[0052] Pull out the P8, P5 and P4 plugs of the air conditioner control unit FPC24 respectively.

[0053] After confirming that each switch on the switch panel is in the closed position, connect the P8, P5 and P4 plugs on the intelligent start switch to the corresponding plugs on the FPC24 in turn.

[0054] Turn the air conditioner knob back to "automatic" position, and reset QF14.

[0055] Press the switches in order (the first four control air conditioning unit 1, and the last four control air conditioning unit 2. The switch order is from left to right in the following), and start air conditioning unit 1 and air conditioning unit 2 in turn.

[0056] Start the air supply fan 1: press the air supply fan switch ① to start the air supply fan 1. Determine the low speed and high speed start conditions of the air supply fan 1 through the contactor KM14 and KM15 attraction state, and confirm that the air supply fan 1 (KM14 or KM15 attraction) is started before proceeding to the next step.

[0057] Start the condenser 1: press the condenser low speed switch ② or the condenser high speed switch ③ to start the air conditioning condenser fan 1 at low speed or high speed (low speed and high speed control are interlocked, only one of the switches needs to be pressed). Determine the low speed start condition of the condenser fan 1 through the contactor KM13 attraction state, and determine the high speed start condition of the condenser fan 1 through the contactor KM12 attraction state. Confirm that the condenser 1 (KM12 or KM13 attraction) is started before proceeding to the next step.

[0058] Start the compressor 1: press the compressor + liquid valve switch ④ to start the air conditioning compressor 1 and liquid valve 1. Determine the start condition of the compressor 1 through the contactor KM11 attraction state, and confirm that the compressor 1 (KM11 attraction) is started before proceeding to the next step.

[0059] Start the air supply fan 2: press the air supply fan switch ⑤ to start the air conditioning air supply fan 2. Determine the low speed and high speed start conditions of the air supply fan 2 through the contactor KM16 and KM11 attraction state, and confirm that the air supply fan 2 (KM16 or KM17 attraction) is started before proceeding to the next step.

[0060] Start the condenser 2: press the condensing low-speed switch ⑥ or the condensing high-speed switch ⑦ to start the air conditioner condensing fan 2 at low speed or high speed (low speed and high speed control exist interlock, only need to press one of the switches), through the contactor KM23 attraction state to determine the condensing fan 2 low speed start condition, through the contactor KM22 attraction state to determine the condensing fan 2 high speed start condition, confirm the condenser 2 start (KM22 or KM23 attraction) after the next step.

[0061] Start the compressor 2: press the compressor + liquid valve switch ⑧ to start the air conditioner compressor 2 and liquid valve 2, through the contactor KM21 attraction state to determine the compressor 2 start condition, confirm the compressor 2 start (KM21 attraction).

[0062] Finally, it should be noted that: the above examples are used to illustrate the technical solutions of the embodiments of the present application, rather than limit them; although the embodiments of the present application are described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A CRH1A EMU air conditioning starting switch, characterized in that: The switch panel and the P8 connector, the P4 connector and the P5 connector which can be connected with the FPC24 air conditioner control unit are included; the first air conditioner switch group is arranged on the switch panel, the first air conditioner switch group includes the first switch, the second switch, the third switch and the fourth switch; the P8.A3 pin of the P8 connector is used to connect the FPC24 air conditioner control unit to obtain power from the FPC24 air conditioner control unit; the first end of the first switch is connected with the P8.A3 pin of the P8 connector, the second end of the first switch is connected with the P4.A7 pin and the P4.B7 pin of the P4 connector respectively, when the first switch is pressed, the P4.A7 pin and the P8.A3 pin of the P8 connector, the P4.B7 pin and the P8.A3 pin of the P8 connector are conducted respectively, the P4.A7 pin is used to be connected with the first air blower high-speed starting control signal input port DO-9 port of the FPC24 air conditioner control unit, the P4.B7 pin is used to be connected with the first air blower low-speed starting control signal input port DO-10 port of the FPC24 air conditioner control unit; the third switch is a double control switch, the incoming line end of the third switch is connected with the P8.A3 pin of the P8 connector, the normally open outgoing line end of the third switch is connected with the P4.B1 pin of the P4 connector; the normally closed outgoing line end of the third switch is connected with the first end of the second switch, the second end of the second switch is connected with the P5.A6 pin of the P5 connector, when the third switch is pressed, the P4.B1 pin and the P8.A3 pin of the P8 connector are conducted, the third switch is reset and the second switch is pressed, the P5.A6 pin and the P8.A3 pin of the P8 connector are conducted; the P4.B1 pin is used to be connected with the first condenser fan high-speed starting control signal input port DO-2 port of the FPC24 air conditioner control unit, the P5.A6 pin is used to be connected with the first condenser fan low-speed starting control signal input port DO-19 port of the FPC24 air conditioner control unit; the first end of the fourth switch is connected with the P8.A3 pin, the second end is connected with the P4.B2 pin and the P4.A1 pin of the P4 connector respectively, when the fourth switch is pressed, the P4.B2 pin and the P8.A3 pin of the P8 connector, the P4.A1 pin and the P8.A3 pin of the P8 connector are conducted respectively, the P4.A1 pin is used to be connected with the starting control signal input port DO-1 port of the first compressor of the FPC24 air conditioner control unit, the P4.B2 pin is used to be connected with the first electromagnetic valve starting signal input port DO-4 port of the FPC24 air conditioner control unit.

2. The CRH1A EMU air conditioner starting switch according to claim 1, characterized in that: The second air conditioner switch group is arranged on the switch panel, and includes a fifth switch, a sixth switch, a seventh switch and an eighth switch; the first end of the fifth switch is connected with the P8.A3 pin of the P8 connector, and the second end of the fifth switch is respectively connected with the P4.A8 pin and the P4.B8 pin of the P4 connector; when the fifth switch is pressed, the P4.A8 pin and the P8.A3 pin of the P8 connector and the P4.B8 pin and the P8.A3 pin of the P8 connector are respectively turned on; the P4.A8 pin is used for being connected with the second air supply fan high-speed starting control signal input port DO-11 port of the FPC24 air conditioner control unit; the P4.B8 pin is used for being connected with the second air supply fan low-speed starting control signal input port DO-12 port of the FPC24 air conditioner control unit; the seventh switch is a double-control switch; the incoming line end of the seventh switch is connected with the P8.A3 pin; the normally open outgoing line end of the seventh switch is connected with the P4.A2 pin of the P4 connector; the normally closed outgoing line end of the seventh switch is connected with the first end of the fifth switch; the second end of the fifth switch is connected with the P5.B6 pin of the P5 connector; when the seventh switch is pressed, the P4.A2 pin and the P8.A3 pin of the P8 connector are turned on; when the seventh switch is reset and the sixth switch is pressed, the P5.B6 pin and the P8.A3 pin of the P8 connector are turned on; The P4.A2 pin is used for being connected with the second condensing fan high-speed starting control signal input port DO-3 port of the FPC24 air conditioner control unit; the P5.B6 pin is used for being connected with the second condensing fan low-speed starting control signal input port DO-20 port of the FPC24 air conditioner control unit; the first end of the eighth switch is connected with the P8.A3 pin; the second end of the eighth switch is respectively connected with the P5.A7 pin and the P5.A4 pin of the P5 connector; when the eighth switch is pressed, the P5.A7 pin and the P8.A3 pin of the P8 connector and the P5.A4 pin and the P8.A3 pin of the P8 connector are respectively turned on; the P5.A7 pin is used for being connected with the starting control signal input port DO-22 port of the second compressor of the FPC24 air conditioner control unit; and the P5.A4 pin is used for being connected with the second electromagnetic valve starting signal input port DO-5 port of the FPC24 air conditioner control unit.

3. A motor train unit air conditioning starting system, characterized by: The motor train unit air conditioner starting switch and the FPC24 air conditioner control unit are included in the motor train unit air conditioner starting switch and the FPC24 air conditioner control unit of any one of claims 1-2; the FPC24 air conditioner control unit includes a first air supply fan control circuit, a first condensing fan control circuit and a first compressor control circuit. The first air blower control circuit comprises a contactor KA6, a contactor KM15, a contactor KM14, a first air blower, a first air blower low-speed start control switch group for controlling low-speed start of the first air blower, and a first air blower high-speed start control switch group for controlling high-speed start of the first air blower; the coil A1 end of the contactor KA6 is connected with the first air blower low-speed start control signal input port DO-10 of the FPC24 air conditioner control unit, the coil A2 end of the contactor KA6 is connected with the 21 end of the normally closed contact 21-22 of the contactor KM14, the 22 end of the normally closed contact 21-22 of the contactor KM14 is connected with the coil A1 end of the contactor KM15, the coil of the contactor KM15 is further connected with the first air blower low-speed start control switch group to control the on-off of the first air blower low-speed start control switch group, so that when the coil of the contactor KM15 is electrified, the first air blower low-speed start control switch group is closed to make the first air blower rotate at low speed; the 14 end of the normally open contact 14-11 of the contactor KA6 is connected with the first air blower high-speed start control signal input port DO-9 of the FPC24 air conditioner control unit, the 11 end of the normally open contact 14-11 of the contactor KA6 is connected with the coil A1 end of the contactor KM14, the coil of the contactor KA6 is further connected with the normally open contact 14-11 of the contactor KA6 to control the on-off of the normally open contact 14-11 of the contactor KA6, so that when the coil of the contactor KA6 is electrified, the normally open contact 14-11 of the contactor KA6 is closed; the coil of the contactor KM14 is further connected with the first air blower high-speed start control switch group and the normally closed contact 21-22 of the contactor KM14 to control the on-off of the first air blower high-speed start control switch group and the normally closed contact 21-22 of the contactor KM14, so that when the coil of the contactor KM14 is electrified, the first air blower high-speed start control switch group is closed to make the first air blower rotate at high speed, and the normally closed contact 21-22 of the contactor KM14 is disconnected; The first condensing fan control circuit comprises a contactor KM12, a contactor KM13, a first condensing fan, a first condensing fan low-speed starting control switch group for controlling the low-speed starting of the first condensing fan, and a first condensing fan high-speed starting control switch group for controlling the high-speed starting of the first condensing fan; the 21 end of the normally closed contact 21-22 of the contactor KM13 is connected with the first condensing fan high-speed starting control signal input port DO-2 of the FPC 24 air conditioner control unit, the 22 end of the normally closed contact 21-22 of the contactor KM13 is connected with the coil A1 end of the contactor KM12, the 31 end of the normally closed contact 31-32 of the contactor KM12 is connected with the first condensing fan low-speed starting control signal input port DO-19 of the FPC 24 air conditioner control unit, the 32 end of the normally closed contact 31-32 of the contactor KM12 is connected with the coil A1 end of the contactor KM13, the coil of the contactor KM13 is further connected with the first condensing fan low-speed starting control switch group and the normally closed contact 21-22 of the contactor KM13 so as to control the on-off of each of them, when the coil of the contactor KM13 is electrified, the first condensing fan low-speed starting control switch group is closed to make the first condensing fan rotate at low speed, and the normally closed contact 21-22 of the contactor KM13 is disconnected; the coil of the contactor KM12 is further connected with the first condensing fan high-speed starting control switch group and the normally closed contact 31-32 of the contactor KM12 so as to control the on-off of each of them, when the coil of the contactor KM13 is electrified, the first condensing fan high-speed starting control switch group is closed to make the first condensing fan rotate at high speed, and the normally closed contact 31-32 of the contactor KM12 is disconnected; The first compressor control circuit comprises a contactor KM11, a first compressor, a first compressor starting control switch group for controlling the starting of the first compressor, and a first electromagnetic valve 1-1 for controlling the on-off of the liquid circuit of the first compressor; the coil A1 end of the contactor KM11 is connected with the starting control signal input port DO-1 of the first compressor of the FPC 24 air conditioner control unit, the coil of the contactor KM11 is further connected with the first compressor starting control switch group, the coil of the contactor KM11 is electrified, and the first compressor starting control switch group is closed to make the first compressor start; the first electromagnetic valve 1-1 is connected with the first electromagnetic valve starting signal input port DO-4 of the FPC 24 air conditioner control unit, and the first electromagnetic valve starting signal input port DO-4 of the FPC 24 air conditioner control unit outputs a signal to control the switch of the first electromagnetic valve 1-1.

4. The starting system of air conditioner of motor train unit according to claim 3, characterized in that: The FPC 24 air conditioner control unit further comprises a second supply fan control circuit, a second condensing fan control circuit, and a second compressor control circuit; The second air blower control circuit comprises a contactor KA7, a contactor KM17, a contactor KM16, a second air blower, a second air blower low-speed starting control switch group for controlling low-speed starting of the second air blower, and a second air blower high-speed starting control switch group for controlling high-speed starting of the second air blower; the coil A1 end of the contactor KA7 is connected with the second air blower low-speed starting control signal input port DO-12 of the FPC24 air conditioner control unit, the coil A2 end of the contactor KA7 is connected with the 21 end of the normally closed contact 21-22 of the contactor KM16, the 22 end of the normally closed contact 21-22 of the contactor KM16 is connected with the coil A1 end of the contactor KM17, the coil of the contactor KM17 is further connected with the second air blower low-speed starting control switch group so as to control the on-off of the second air blower low-speed starting control switch group, so that when the coil of the contactor KM17 is electrified, the second air blower low-speed starting control switch group is closed to make the second air blower rotate at low speed; the 14 end of the normally open contact 14-11 of the contactor KA7 is connected with the second air blower high-speed starting control signal input port DO-17 of the FPC24 air conditioner control unit, the 11 end of the normally open contact 14-11 of the contactor KA7 is connected with the coil A1 end of the contactor KM16, the coil of the contactor KA7 is further connected with the normally open contact 14-11 of the contactor KA7 so as to control the on-off of the normally open contact 14-11 of the contactor KA7, so that when the coil of the contactor KA7 is electrified, the normally open contact 14-11 of the contactor KA7 is closed; the coil of the contactor KM16 is further connected with the second air blower high-speed starting control switch group and the normally closed contact 21-22 of the contactor KM16 so as to control the on-off of the second air blower high-speed starting control switch group and the normally closed contact 21-22 of the contactor KM16, so that when the coil of the contactor KM16 is electrified, the second air blower high-speed starting control switch group is closed to make the second air blower rotate at high speed, and the normally closed contact 21-22 of the contactor KM16 is disconnected; The second condensing fan control circuit comprises a contactor KM22, a contactor KM23, a second condensing fan, a second condensing fan low-speed starting control switch group for controlling the low-speed starting of the second condensing fan, and a second condensing fan high-speed starting control switch group for controlling the high-speed starting of the second condensing fan; the 21 end of the normally closed contact 21-22 of the contactor KM23 is connected with the second condensing fan high-speed starting control signal input port DO-3 of the FPC24 air conditioner control unit, the 22 end of the normally closed contact 21-22 of the contactor KM23 is connected with the coil A1 end of the contactor KM22, the 21 end of the normally closed contact 21-22 of the contactor KM22 is connected with the second condensing fan low-speed starting control signal input port DO-20 of the FPC24 air conditioner control unit, the 22 end of the normally closed contact 21-22 of the contactor KM22 is connected with the coil A1 end of the contactor KM23, the coil of the contactor KM23 is further connected with the second condensing fan low-speed starting control switch group and the normally closed contact 21-22 of the contactor KM23 so as to control the on-off of each of them, when the coil of the contactor KM23 is electrified, the second condensing fan low-speed starting control switch group is closed to make the second condensing fan rotate at low speed, and the normally closed contact 21-22 of the contactor KM23 is disconnected; the coil of the contactor KM22 is further connected with the second condensing fan high-speed starting control switch group and the normally closed contact 21-22 of the contactor KM22 so as to control the on-off of each of them, when the coil of the contactor KM23 is electrified, the second condensing fan high-speed starting control switch group is closed to make the second condensing fan rotate at high speed, and the normally closed contact 21-22 of the contactor KM22 is disconnected; The second compressor control circuit comprises a contactor KM21, a second compressor, a second compressor starting control switch group for controlling the starting of the second compressor, and a second electromagnetic valve 2-1 for controlling the on-off of the liquid circuit of the second compressor; the coil A1 end of the contactor KM21 is connected with the starting control signal input port DO-17 of the second compressor of the FPC24 air conditioner control unit, the coil of the contactor KM21 is further connected with the second compressor starting control switch group, the coil of the contactor KM21 is electrified, and the second compressor starting control switch group is closed to make the second compressor start; the second electromagnetic valve 2-1 is connected with the second electromagnetic valve starting signal input port DO-22 of the FPC24 air conditioner control unit, and the first electromagnetic valve starting signal input port DO-22 of the FPC24 air conditioner control unit outputs a signal to control the switch of the second electromagnetic valve 2-1.

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