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16 Safety instructions
Electrical safety in installation, start-up and maintenance
￭
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.
Prepare for the work.
•
Make sure that you have a work order.
•
Do an on-site risk assessment or job hazard analysis.
•
Make sure that you have the correct tools available.
•
Make sure that the workers are qualified.
•
Select the correct personal protective equipment (PPE).
•
Stop the motor(s).
2. Clearly identify the work location and equipment.
3. 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.
•
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.
•
Open the main isolating device of the drive.
•
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.
4. Protect other energized parts in the work location against contact and take
special precautions when close to bare conductors.
5. Measure that the installation is de-energized. Use a quality voltage tester.
•
Before and after you measure 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.
•
Make sure that the voltage between the drive DC terminals (UDC+ and
UDC-) and the grounding (PE) terminal is zero.
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