Disconnect the frequency inverter from mains voltage and protect it against being
energized unintentionally.
Verify safe isolation from power supply.
Work on the device may only be started once the DC link capacitors have discharged.
The time to wait is at least 3 minutes in the case of size 5.
When the frequency inverter is disconnected from power supply, the mains, DC-link
voltage and motor terminals may still be live for some time.
Switch off power supply before connecting or disconnecting the mains cable to/from
terminal X1, the motor cables and the brake resistor to/from terminal X2.
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