Electrical Safety Precautions - ABB ACS880-207 Hardware Manual

42 Electrical installation

Electrical safety precautions

This information is for all personnel who do work on the supply unit.
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 installation or maintenance work. Go through these steps before you begin
any installation or maintenance work.
1. Keep the cabinet doors closed when the drive is powered. With the doors open, a risk
of a potentially fatal electric shock, arc flash or high-energy arc blast exists.
2. Clearly identify the work location.
3. Disconnect all possible voltage sources.
•
Open the main switch-disconnector [Q1], or rack out the main breaker [Q1] of the
drive (whichever is present).
•
Open the disconnector of the supply transformer as the main disconnecting device
of the drive does not remove the voltage from the input busbars of the drive or
from the voltmeter (option +G334).
•
Make sure that reconnection is not possible. Lock the disconnectors to open
position and attach a warning notice to them.
•
Disconnect any external power sources from the control circuits before you do
work on the control cables.
•
After you disconnect the drive, always wait for 5 minutes to let the intermediate
circuit capacitors discharge before you continue.
4. Protect any other energized parts in the work location against contact.
5. Take special precautions when close to bare conductors.
6. 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 drive input power terminals 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).
•
Make sure that the voltage between the drive DC busbars (+ and -) and the
grounding (PE) busbar is close to 0 V.
7. Install temporary grounding as required by the local regulations. Close the grounding
switch (option +F259, [Q9]) if present, or connect the AC and DC busbars to PE with a
temporary grounding tool.
•
Ask for a permit to work from the person in control of the electrical installation
work.