14 Safety instructions
Electrical safety precautions
These electrical safety precautions are for all personnel who do work on the drive,
motor cable or motor.
This manual does not give detailed information for disconnecting and isolating all
drive types. Refer also to the drive or inverter unit hardware manual.
WARNING! Obey these instructions and the safety instructions of the drive. 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 start 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.
• 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.
• Before and after measuring the installation, verify the operation of the voltage
tester on a known voltage source.
• ACS880 drives:
• 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 and the grounding
(PE) busbar is zero.
• DCS880 drives:
• Make sure that the voltage between drive input phases U1, V1 and W1 and
the frame is zero.
• Make sure that the voltage between terminals C+ and D- and the frame is
zero.
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