BENSHAW RSi GX Series Hardware Manual page 34

3 - RECEIVING AND INSTALLATION
Use of Isolation Transformers and Line Reactors
In most cases the RSi GX drive may be directly connected to a power source. However in
the following cases a properly sized isolation transformer or a 3% or 5% line reactor should
be used to minimize the risk of drive malfunction.
When the source capacity exceeds ten (10) times the KVA rating of the drive.
•
When power factor capacitors are located on the input source supplying the drive.
•
When the power source experiences frequent power transients and/or voltage spikes.
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When the power source supplying the RSi GX drive also supplies other large electrical
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devices such as DC drives that contain rectifiers or other switching devices.
When the drive is powered from an ungrounded (floating) Delta connected source. In
•
this case a drive isolation transformer utilizing a grounded secondary should be used.
Motor Lead Length Specifictations
Excessive motor lead lengths may adversely effect the performance of the motor. The
voltage of the pulses at the motor terminals can be almost double the input voltage of the
drive. This in turn can cause additional stress on the motor insulation and shorten the life of
the motor. The motor manufacturer should be consulted regarding the specifications of the
motor insulation.
Lead lengths from the drive to the motor in excess of those listed below may require filters
to be added to the output of the drive. Contact Benshaw for application assistance when
using lead lengths in excess of those listed.
If an output filter is used it is recommended that the output filter is wired as follows:
Drive Voltage
Rating
230V
460V
Wiring distance from drive output to filter input should not exceed 5 meters (16.4 feet).
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Wiring distance from filter to motor should not exceed 300 meters (984 feet).
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PWM Carrier Frequency
All
Less than or equal 5KHz
Greater than 5KHz
U,V,W
Drive
Within 5m
Suggested Max. Motor Lead Length
300m (1000 ft)
180m (600 ft)
90m (300 ft)
Motor
Within 300m