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When the cargo machine is controlled by PLC, due to the operation requirements and the limitation of the on-off current of the PLC, the operation still uses the master controller, and the main circuit uses the contactor. The original part of the relay and the contactor sub-contact are used instead. PLC control. There are many types of PLCs. Now we introduce the series 1 standard PLC of GE (General Electric) Company as the control unit. The system only uses 12 input channels, n output channels, PLC hardware wiring and 1/0 points of the system. distribution.
The purpose of pressure loss protection and fan control voltage loss protection is to prevent the automatic start of the system regardless of the position of the main handle when the power is restored after the power failure, so as to prevent the cargo machine from being operated unattended. The program uses the internal power-on flag 374 of the PLC (located at the user program address 00, that is, the PLC gives a pulse when the voltage is turned on, 374 sets 374, and the normally closed contact of 345 (address Q75) 34. In series, the main control lockout of all control procedures for the release brake, lifting and three-speed contactor is formed, so that all the disconnection, the system can not work. Only when the handle is returned to zero (006 is set to 1), 345 can Reset, the system is only possible to restart. Fan Han point 035 (address 006) is only controlled by the wind window switch and fan overload two input signals, so after the system is powered up, if the wind window is open and the fan is not overloaded (105 The set fan is running. The electromagnetic brake and its reverse control have been mentioned before. When there is fault and loss of pressure protection, the normally closed contacts at 340 and 345 at addresses 074 and 075 are closed. Under (the 162 normally closed contact is closed at 078), as long as one of the three-speed windings is energized, that is, any one of 031-033 is set to 1 to make the electromagnetic brake coil energize and overcome the elastic force of the brake spring to release the brake. The cargo machine starts to operate. The address 082-093 is positive. The reverse control is similar to a general contactor interlock circuit.
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