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Test Operation, Troubleshooting and Maintenance
4.3 Power distribution
4.3.1 Power distribution logic
380V AC 3Ph
3Ph
3Ph
Main board
Protection conditions: phase loss or reversal of the power input for the phase protector.
Action result: No power for the controller and ON/OFF operation is failed.
Handling: interchange the wiring sequence and check if the voltage of the 3-phase power supply is
normal.
4.3.2 Introduction to main electric elements
Image Name Description
Phase loss/reversal protector
It is used to check if the phase
sequence of the power supply is
correct or if there is power loss.
Intermediate relay
It is used for the running and
fault indicators.
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