Shunhao Company’s melamine crockery molding machine uses 1-on-1 circuit wiring method, that means the electrical box microcomputer input signal and the output signal has its own name, and also have their own functions and lights, so just check whether the respective signal lights are on when they are triggered, to confirm whether the electrical components are normal or damaged. The following are examples to make it clear.

Input signal:

1. Press “MOTOR START”, then No.4 light upper line of PLC should work; If not light, then check whether it is under Manual way or the button is damaged or broken off wire;

2. Take an iron bar before (Rising limited) approaching switch, then No.17 light of PLC should work; If not light, change the approaching switch or check the X17 wire broken off.

Input signal:

PLC output, because of its lower resistance - current, first start the relay and then use relay to start hydraulic valves or electromagnetic contactor.

Note: PLC lower part is LX voltage (relay coil is DC24V), R on the relay board and Y0-Y12 is AC220V. DO NOT connect “COM” with Y0-Y12.

Input signal:

1. Press , the No. 0 light upper line of PLC should work, If not light, then check whether r the thermal relay is tripped or damaged, or the Y0 wire is broken or off

2. Connect the lower end of the PLC with a wire, and , the second relay of the lower left relay board (upper LEI) lights up, and the corresponding oil pressure valve indicator lights up. If no work, please replace the blue relay or check whether the wire is broken or off.

The following is a description of the input and output signals:

Tip:Automatic melamine molding machine with PLC system is easier to check and maintenance, WHY?

Because of this Input or Output signal from PLC will tell you which action is not proper from PLC lights showing.

When the case happening, just check the PLC lights or send pictures to us, Shunhao Engineers team could check for your machine accordingly.