Permanent Magnet Motor Drives - ABB ACS880-01 Hardware Manual

16 Safety instructions

Permanent magnet motor drives

These are additional warnings concerning permanent magnet motor drives.
WARNING! Ignoring the instructions can cause physical injury or death, or
damage to the equipment:
• Do not work on the drive when the permanent magnet motor is rotating. Also,
when the supply power is switched off and the inverter is stopped, a rotating
permanent magnet motor feeds power to the intermediate circuit of the drive
and the supply connections become live.
Before installation and maintenance work on the drive:
• Stop the motor.
• Ensure that there is no voltage on the drive power terminals according to step
1 or 2, or if possible, according to the both steps.
1. Disconnect the motor from the drive with a safety switch or by other
means. Check by measuring that there is no voltage present on the drive
input or output terminals (L1, L2, L3, T1/U, T2/V, T3/W, UDC+, UDC-).
2. Ensure that the motor cannot rotate during work. Make sure that no other
system, like hydraulic crawling drives, is able to rotate the motor directly or
through any mechanical connection like felt, nip, rope, etc. Check by
measuring that there is no voltage present on the drive input or output
terminals (L1, L2, L3, T1/U, T2/V, T3/W, UDC+, UDC-). Ground the drive
output terminals temporarily by connecting them together as well as to the
PE.