ABB ACQ580-07, Hardware Manual

Page: 102 / 324

It keeps the contactor closed in short power-loss situations. If the drive is equipped an
external uninterruptible auxiliary power supply (G307), it keeps the main contactor
closed in power-loss situations.
Note that if the power loss lasts so long that the drive trips on undervoltage, a fault reset
and a fresh start command is required to continue operation.
Implement the power-loss ride-through function as follows:
1. Enable the power-loss ride-through function of the drive (parameter 30.31 ).
2. Enable the automatic restart of the motor after a short power supply break:
• Set the start mode to automatic (parameter 21.01 or 21.19 , depending on the
motor control mode being used).
• Define the automatic restart time (parameter 21.18 ).
WARNING!
Make sure that a flying restart of the motor will not cause any danger. If you are
in doubt, do not implement the power loss ride-through function.
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. Make sure 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.
98 Guidelines for planning the electrical installation