Permanent Magnet Motor; Installation And Maintenance Work; Start-Up And Operation - ABB ACS800-04 Hardware Manual

16 Safety instructions

Permanent magnet motor

These are additional warnings for permanent magnet motor drives. If you ignore the
instructions, physical injury or death, or damage to the equipment can occur.
Control a permanent magnet motor only with the ACS800 Permanent Magnet
Synchronous Motor Drive Control Program.

Installation and maintenance work


WARNING! Do not do work on the drive when the permanent magnet motor
turns. When the supply power is off and the inverter is stopped, a turning
permanent magnet motor feeds power to the intermediate circuit of the
drive and the supply connections become live.
Before you do installation and maintenance work on the drive:
•
Stop the motor.
•
Make sure that the motor cannot turn during work. Prevent the start-up of any
drives in the same group by opening the Prevention of unexpected start switch
(option +Q950) or the Safe torque off switch (option +Q967) and locking it. Make
sure that no other system, such as hydraulic crawling drives, are able to turn the
motor directly or through any mechanical connection such as felt, nip, rope, and
so on.
•
Make sure 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, output
or DC terminals (U1, V1, W1, U2, V2, W2, UDC+, UDC-).
Alternative 2)
Measure that there is no voltage present on the drive input, output
or DC terminals (U1, V1, W1, U2, V2, W2, UDC+, UDC-). Ground the drive output
terminals temporarily by connecting them together and to the PE.
Alternative 3)
If it is possible, do both of the above

Start-up and operation


WARNING! Do not run the motor over the rated speed. Motor overspeed
leads to overvoltage which can damage the capacitors in the intermediate
circuit of the drive.
.