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The Drive master PLC receives requests from individual
motor PLCs for transfer operations. The master PLC checks
system permissives and system status before initiating a
transfer sequence.
Figure 68. Synchronous transfer
The master PLC sequences and monitors each motor's
bypass contactor, motor select contactor and motor status to
assure that proper execution of drive operation and contactor
switching take place. Since a successful transfer includes
voltage, frequency and phase synchronization between the
SC9000 EP and the utility bus, the drive times each transfer
step to the millisecond.
SC9000 EP medium voltage drives IB020001EN—February 2016 www.eaton.com
Appendix D: Optional equipment
71
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