AC15QTP And AC20QTP Operations Manual....
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5.2
ELECTRICAL INSTALLATION, cont.
5.2.6 Seamless Transfer Connections
If the Seamless Transfer Option was ordered with the system, connections must be made
between the generator/switchgear and converter. These connections are used by the converter to
successfully manage Seamless Transfer operation and are comprised of control, signal, and
feedback functions. These connections are only required in the Master cabinet of a multi-cabinet
installation. Use of 14-18AWG wire is recommended for signal and control wiring.
A variety of Seamless Transfer Option types exist. These include two generator, three and four
generator, Hybrid (switchgear cooperative), and Clean Bus types. Installation requirements for
such options vary in accordance with switchgear design and hence are beyond the scope of this
Operations Manual.
Contact the factory for complete and specific system wiring drawings. These can be
supplied in either printed or electronic format
.
The Seamless Transfer Option uses momentary control signals to operate switchgear contactors
or circuit breakers that mange generator connection to the ship’s distribution bus. The control
pulse width for these momentary control signals is 0.6 seconds for both the open and close
commands. The contacts used for generator control are rated for a maximum of 8A @250VAC
or 5A @24VDC.
The generator contactor or circuit breaker must be equipped with an auxiliary switch contact
set—closed when the main contacts are closed.
Generator voltage sense wires are used by the converter to match its output voltage, frequency,
and phase angle to the generator’s and should be fused at the generator/switchgear.
