Checks And Maintenance; Megger Test - Siemens S120 Instructions Manual

12 CHECKS AND MAINTENANCE

To ensure long service life and optimum operation of the inverter, carry out the following checks at regular
intervals.
Operate on the inverter only after disconnecting the power and making sure the keypad is off.
1- Remove the dust collected on the cooling fins and on the control circuit board, if possible by blowing with
compressed air or using a vacuum cleaner.
2- Make sure no screws are loose in the power or control terminal blocks.
3- Make sure inverter operation is "normal" and that there are no signs of anomalous overheating.

12.1 MEGGER TEST

When doing insulation tests using a Megger tester on the input/output cables or on the motor, remove all the
connections from all the inverter terminals and perform the test only on the power circuit, according to the
diagram opposite. Do not test the control circuits.
Siemens S120_EN_rev06-08062017.docx 12-1