Safety instructions
10
Permanent magnet motor
These are additional warnings concerning permanent magnet motor drives. Ignoring
the instructions can cause physical injury or death, or damage to the equipment.
Installation and maintenance work
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 the motor cannot rotate during work. Prevent the start-up of any
drives in the same mechanical group by opening the “prevention of unexpected
start” switch and padlocking it. Make sure that no other system, like hydraulic
crawling drives, are able to rotate the motor directly or through any mechanical
connection like felt, nip, rope, etc.
• Ensure that there is no voltage on the drive power terminals:
Alternative 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, UDC+, UDC-).
Alternative 2) Measure that there is no voltage present on the drive input or output
terminals (U1, V1, W1, U2, V2, W2, UDC+, UDC-). Ground the drive output
terminals temporarily by connecting them together as well as to the PE.
Alternative 3) If possible, both of the above.
Start-up and operation
WARNING! 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.
Controlling a permanent magnet motor is only allowed using the ACS800 Permanent
Magnet Synchronous Motor Drive Control Program, or other control programs in
scalar control mode.
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