Guidelines for planning the electrical installation 83
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 inverter unit is enabled with
parameter 30.31 Undervoltage control in the ACS880 primary control program.
WARNING! Make sure that the flying restart of the motor will not cause any
danger. If you are in doubt, do not implement the Power-loss ride-through
function.
The main contactor of the drive opens in a power-loss situation. When the power returns,
the contactor closes. However, if the power-loss situation lasts so long that the drive trips
on undervoltage, it must be reset and started again to continue operation. If the power-loss
situation lasts so long that the buffer module (see page 36) runs out, the main contactor
remains open and the drive operates only after reset and a new start.
With external uninterruptible control voltage (option +G307), the main contactor remains
closed in power-loss situations. If the power-loss situation lasts so long that the drive trips
on undervoltage, it must be reset and started again to continue operation.
Supplying power for the auxiliary circuits
The drive is equipped with an auxiliary control voltage transformer which supplies control
voltage, for example, for the control devices and cabinet fan(s).
The following options are to be supplied from external power sources:
• +G300/+G301: Cabinet heaters and/or lighting (230 or 115 V AC; external fuse: 16 A)
• +G307: Connection for an external uninterruptible power supply (230 or 115 V AC;
external fuse: 16 A) to the control unit and control devices when the drive is not
powered
• +G313: Power supply connection (230 V AC; external fuse 16 A) for a motor space
heater output.
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.
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