How to solve the main motor of concrete mixer can not be started

How to solve the main motor of concrete mixer can not be started

 Symptom: Press the mixer start button on the console, the mixer does not start. Analysis of the reasons: 

1. The air compressor is not started or the pressure of the air supply system is not reached. 
2. The maintenance switch of the mixing machine and the keyed stop switch on the main unit are not connected. 
3. The stop switch on the console is not reset. 
4. The main power switch is not turned on. 
5. The host stop signal must be reset. 
Processing: 
1. Check whether the compressed air detection signal (pressure signal greater than 0.4MPa) is sent to the PLC, that is, whether I8.0 has a signal. If there is no signal in I8.0, check if the pressure of the air compressor is greater than 0.4MPa. When the pressure reaches 0.4MPa or above, if there is no signal at I8.0, check whether the adjustment of the electric contact pressure gauge is normal or damaged until I8.0 has signal. 
2. Check whether the stirring host maintenance switch is connected to the PLC.
3. Check whether the stop switch on the console is reset.
4. Check if the power switch of the host is connected. 5. Check whether the stop button of the host is reset.

2018-07-16 16:13:36