Table of Contents
Advertisement
Important! Repeat the measurement also with the DC voltage setting of the tester.
Measure between each phase and ground. There is a risk of dangerous DC voltage
charging due to leakage capacitances of the motor circuit. This voltage can remain
charged even 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. 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.
Electrical installation 25
11
Advertisement
Table of Contents
