Permanent Magnet Synchronous Motor; Installation And Maintenance Work; Start-Up And Operation - ABB ACS800-U7 Hardware Manual

10

Permanent magnet synchronous motor

These are additional warnings concerning permanent magnet synchronous 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 synchronous
motor is rotating. Also, when the supply power is switched off and the inverter is
stopped, a rotating permanent magnet synchronous 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-up switch (option +Q950) or Safe torque off switch (option +Q968) 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 (L1, L2, L3, U2, V2, W2, UDC+, UDC-).
Alternative 2) Measure that there is no voltage present on the drive input or output
terminals (L1, L2, L3, 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 synchronous motor is only allowed using the control
program for Permanent Magnet Synchronous Machine Drive.
Note concerning permanent magnet motor drives in case of a multiple IGBT
power semiconductor failure: In spite of the activation of the Safe torque off
(option +Q968) or the Prevention of unexpected start-up (option +Q950) function,
the drive system can produce an alignment torque which maximally rotates the
motor shaft by 180/p degrees. p denotes the pole pair number.
Safety instructions