Using Power Factor Compensation Capacitors With The Drive; Using A Safety Switch Between The Drive And The Motor; Implementing The Power-Loss Ride-Through Function; Implementing The Control Of A Contactor Between Drive And Motor - ABB ACS880 Electrical Planning Manual
Liquid-cooled multidrive cabinets and modules
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Using power factor compensation capacitors with the drive
Power factor compensation is not needed with AC drives. However, if a drive is to be
connected in a system with compensation capacitors installed, note the following restrictions.
WARNING!
Do not connect power factor compensation capacitors or harmonic filters to the
motor cables (between the drive and the motor). They are not meant to be used
with AC drives and can cause permanent damage to the drive or themselves.
If there are power factor compensation capacitors in parallel with the input of the drive:
1. Do not connect a high-power capacitor to the power line while the drive is connected.
The connection will cause voltage transients that may trip or even damage the drive.
2. If capacitor load is increased/decreased step by step when the AC drive is connected
to the power line, make sure that the connection steps are low enough not to cause
voltage transients that would trip the drive.
3. Check that the power factor compensation unit is suitable for use in systems with AC
drives, ie, harmonic generating loads. In such systems, the compensation unit should
typically be equipped with a blocking reactor or harmonic filter.
Using a safety switch between the drive and the motor
ABB recommends to install a safety switch between the permanent magnet motor and the
drive output. The switch is needed to isolate the motor during any maintenance work on the
drive.
Implementing the Power-loss ride-through function
Implement the power-loss ride-through function as follows:
•
Check that the power-loss ride-through function of the drive (inverter unit) is enabled.
See the drive firmware manual.
•
Make sure that the control of the main contactor/breaker either keeps the contactor
closed over the short power break, or closes it after the break automatically.
WARNING!
Make sure that the automatic re-connection of the input power does not cause
any danger. If you are in doubt, do not implement the Power-loss ride-through
function.
Implementing the control of a contactor between drive and
motor
The control of the output contactor depends on how you use the drive, that is, which motor
control mode and which motor stop mode you select.
When you select the DTC motor control mode and the motor ramp stop mode, use this
operation sequence to open the contactor:
1. Give a stop command to the drive.
2. Wait until the drive decelerates the motor to zero speed.
3. Open the contactor.
Electrical planning guidelines 37
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