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Appendix D: Optional equipment
RVSS bypass
When the connected mechanical equipment cannot tolerate
a full-voltage bypass start, reduced voltage solid state bypass
can provide bypass functionality while delivering a smoother,
softer motor start. This can eliminate high motor inrush
currents and connected load mechanical stresses. In
addition, RVSS is easier on the electrical supply system,
softening the burden during the motor start.
This bypass method works well on conveyors, PD pumps
or systems where supplied voltage is limited. Figure 88
shows a typical RVSS cabinet.
Figure 88. Typical RVSS cabinet
80
SC9000 EP medium voltage drives IB020001EN—February 2016 www.eaton.com
Figure 89. Representative RVSS bypass panel layout
Sequence of operation
Control elements colors and symbols
= de-energized
energized
=
contactor closed
Under normal operation, the SC9000 EP is operating and
providing power to the connected motor. The bypass
contactor is in the non-bypass position, with power from
the reduced voltage soft start system not connected to the
motor through the bypass contactor.
Figure 90. RVSS bypass normal operation
= energized bus
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