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56 Electrical installation
Electrical safety precautions
These electrical safety precautions are for all personnel who do work on the drive,
motor cable or motor.
WARNING!
Obey these instructions. If you ignore them, injury or death, or damage to the
equipment can occur.
If you are not a qualified electrical professional, do not do installation or
maintenance work.
Do these steps before you begin any installation or maintenance work.
1.
Clearly identify the work location and equipment.
2.
Disconnect all possible voltage sources. Make sure that re-connection is not
possible. Lock out and tag out.
•
Open the main disconnecting device of the drive.
•
Open the charging switch if present.
WARNING!
The charging switch is not necessarily located within or nearby the
drive cubicle.
•
Open the disconnector of the supply transformer. (The main disconnecting
device in the drive cabinet does not disconnect the voltage from the AC input
power busbars of the drive cabinet.)
•
If the drive is equipped with a DC/DC converter unit (optional) or a DC feeder
unit (optional): Open the DC switch-disconnector [Q11] of the unit. Open the
disconnecting device of the energy storage connected to the unit (outside
the drive cabinet).
•
Open the auxiliary voltage switch-disconnector (if present), and all other
possible disconnecting devices that isolate the drive from dangerous voltage
sources.
•
In the liquid cooling unit (if present), open the switch-disconnector of the
cooling pumps.
•
If you have a permanent magnet motor connected to the drive, disconnect
the motor from the drive with a safety switch or by other means.
•
Disconnect all dangerous external voltages from the control circuits.
•
After you disconnect power from the drive, always wait 5 minutes to let the
intermediate circuit capacitors discharge before you continue.
3.
Protect any other energized parts in the work location against contact.
4.
Take special precautions when close to bare conductors.
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.
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