60 Guidelines for planning the electrical installation
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 is enabled with parameter
30.31 Undervoltage control.
• Set parameter 21.01 Vector start mode to Automatic (in vector mode) or parameter
21.19 Scalar start mode to Automatic (in scalar mode) to make flying start (starting
into a rotating motor) possible. If the installation is equipped with a main contactor,
prevent its tripping at the input power break. For example, use a time delay relay
(hold) in the contactor control circuit.
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.
Units with line contactor (option +F250)
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 buffering module (C22) empties, the main contactor remains
open and the drive operates only after reset and a new start.
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 Cabinet heaters and/or lighting (230 or 115 V AC; external fuse: 16 A gG).
Using power factor compensation capacitors with the
drive
Power factor compensation is not needed with AC drives.
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.
Implementing a safety switch between the drive and the
motor
ABB recommends to install a safety switch between the permanent magnet synchronous
motor and the drive output. The switch is needed to isolate the motor during any
maintenance work on the drive.
To Next Page
Loading...
Need help?
General
