Safety 19
Permanent magnet motor drives
These are additional warnings concerning permanent magnet motor drives. Ignoring
the instructions can cause physical injury or death, or damage to the equipment.
WARNING! 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.
Measure that there is no voltage present on the drive input or output terminals
(U1, V1, W1, U2, V2, W2, BRK+, BRK-).
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. Measure that there
is no voltage present on the drive input or output terminals (U1, V1, W1, U2,
V2, W2, BRK+, BRK-). Ground the drive output terminals temporarily by
connecting them together as well as to the PE.
General safety
WARNING! Ignoring the following instructions can cause physical injury or
death, or damage to the equipment.
• The drive is not field repairable. Never attempt to repair a malfunctioning drive;
contact your local ABB representative or Authorized Service Center for
replacement.
• Make sure that dust from drilling does not enter the drive during the installation.
Electrically conductive dust inside the drive may cause damage or lead to
malfunction.
• Ensure sufficient cooling.
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