ABB ACS880-87LC-3200A, Hardware Manual

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5. Measure that the installation is de-energized.
• Use a multimeter with an impedance of at least 1 Mohm.
• Make sure that the voltage between the converter grid cable terminals (L1, L2, L3)
and the grounding (PE) busbar is close to 0 V.
• Make sure that the voltage between the generator cable terminals (U2, V2, W2) and
the grounding (PE) busbar is close to 0 V.
• Make sure that the voltage between the DC bus and the grounding (PE) busbar is
close to 0 V.
WARNING!
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).
6. Install temporary grounding as required by the local regulations.
7. Ask the person in control of the electrical installation work for a permit to work.
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Additional instructions and notes
WARNING!
Obey these instructions. If you ignore them, injury or death, or damage to the
equipment can occur.
• If you are not a qualified electrician, do not do electrical installation or
maintenance work.
• We do not recommend that you secure the cabinet by arc welding. If you have
to, obey the instructions in the converter hardware manual.
• Do not do insulation or voltage withstand tests on the converter or converter
modules.
• Control boards of the converter unit may be at the main circuit potential.
Dangerous voltages can be present between the control boards and the frame
of the converter unit when the main circuit voltage is on. It is critical that the
measuring instruments, such as an oscilloscope, are used with caution and
safety always as a priority. The fault tracing instructions give special mention
of cases in which measurements may be performed on the control boards, also
indicating the measuring method to be used.
Note:
• The generator cable terminals on the converter are at a dangerously high voltage
when the converter is connected to the grid, regardless of whether the generator
is running or not.
• The converter DC bus carries a dangerous voltage (over 500 V) when the
converter is connected to the grid or when the generator shaft is rotating.
• External wiring can supply dangerous voltages to the terminals of relay outputs.
Safety instructions 15