46 7 Interference and remedies
7.5 Notes on troubleshooting for the electrician
Procedure during troubleshooting:
Voltage measurement at the main switch Input L1-L2-L3 approx. 400V
Output L1-L2-L3 approx. 400V
Voltage measurement at a motor protection switch input approx. 400V
Voltage measurement at the power supply input side approx. 400V AC
Voltage measurement at the power supply output side approx. 24V AC
Checking the sensors
Switching on the machine. The green LED must be lit at the sensors.
The red LED must be lit when the sensors are operated.
All sensors can be checked on the screen below the menu item inputs of whether there
is any feedback.
Motor does not work
Check motor protection switch, measure voltage at the output.
Measure voltage at the switched contactor.
Measure voltage at the terminals.
Check motor cable for damage.
Measure voltage at the motor terminal board; observe that the corresponding contactor
switches, operate contactor manually or via the corresponding screen menu if required.
Checking motor winding.
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