ACS550-02/U2 User’s Manual 23
Planning the electrical installation
Power factor compensation capacitors
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 surge
absorbers 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 three phase
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: Ensure 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, i.e. harmonic generating loads. In such systems, the compensation unit
should typically be equipped with a blocking reactor or harmonic filter.
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