Checking The Insulation Of The Dc Cabling - ABB ACS880-7107LC DC Hardware Manual

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Hardware manual (66 pages)

Table Of Contents

Table of Contents

5. Measure that the installation is de-energized. Use a quality voltage tester. If the

measurement requires removal or disassembly of shrouding or other cabinet structures,

obey the local laws and regulations applicable to live working (including – but not limited

to – electric shock and arc protection).

• Before and after measuring the installation, verify the operation of the voltage tester

on a known voltage source.

• Make sure that the voltage between the drive input power terminals (L1, L2, L3) and

the grounding (PE) busbar is zero.

• Make sure that the voltage between the drive output terminals (T1/U, T2/V, T3/W)

and the grounding (PE) busbar is zero.

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.