Planning the electrical installation
86
Drives of frame sizes 2×R8i+2×R8i and up can be equipped with an optional
auxiliary control voltage transformer which supplies 230 V AC voltage to cooling fans
and control circuits. With option +G304 the supplied voltage is 115 V AC.
The drive can be equipped with terminals for uninterruptible power supply (option
+G307). The circuit ensures voltage for control circuit relays and RMIO boards. The
cooling fans are not supplied.
Terminals for connecting external control voltage (option +G307)
• See section Connecting external power supply for the auxiliary circuits on page
100 for the connection.
• Calculate load using data given in section Auxiliary circuit current consumption on
page 164. Consider only “non-fan” load.
Units without optional auxiliary control transformer and without terminals for
connecting external control voltage (option +G307)
• See section Connecting external power supply for the auxiliary circuits on page
100 for the connection.
• Calculate load using data given in section Auxiliary circuit current consumption on
page 164.
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 to the motor
cables (between the drive and the motor). They are not intended for use with AC
drives and can cause permanent damage to the drive or themselves.
If there are power factor compensation capacitors in parallel with the 3-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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