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voltage can remain charged for a long time after the drive power-off. The
measurement discharges the voltage.
•
Make sure that the voltage between the drive DC terminals (UDC+ and UDC-)
and the grounding (PE) terminal is zero. In cabinet-built drives, measure
between the drive DC busbars (+ and -) and the grounding (PE) busbar.
WARNING!
The busbars inside the cabinet of liquid-cooled drives are partially coated.
Measurements made through the coating are potentially unreliable, so only
measure at uncoated portions. Note that the coating does not constitute
a safe or touch-proof insulation.
6.
If the drive is not equipped with a grounding switch, install temporary grounding
as required by the local regulations.
7.
Ask for a permit to work from the person in control of the electrical installation
work.
WARNING! In case of DC bus remaining alive, Personal Protective Equipment
(PPE) of Level 2 is required for doing maintenance. Note that this is valid for
work on every cabinet of the device.
Electrical installation 45
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