10 Safety
Permanent magnet motor drives
These are additional warnings concerning permanent magnet motor drives.
WARNING! Ignoring the following instructions can cause physical injury or
death, increased electromagnetic interference and equipment malfunction:
• 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, U1, V1, W1, UDC+, UDC-, R+, R-).
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,
U1, V1, W1, UDC+, UDC-, R+, R-). Ground the drive output terminals temporarily
by connecting them together as well as to the PE.
• Do not run the motor over the rated speed. Motor overspeed leads to overvoltage
which may damage or explode the capacitors in the intermediate circuit of the
drive.
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