AC24/30/36 Operations Manual....
22
5.2.3 Seamless Transfer Connections
If the Seamless Transfer Option is ordered with the converter, connections must be made between
the generator and the converter. These connections are used by the converter to successfully manage
the seamless transfer operation and are comprised of control, signal, and feedback functions. The
use of 14-18AWG wire is recommended for signal and control wiring.
Figure 4 on page 23 depicts the power and signal connections for a typical installation (120/240VAC
Split-Phase). A single generator’s wiring is shown for clarity. Contact the factory for complete
and specific system wiring drawings. These can be supplied in either printed or electronic
format.
A motorized circuit breaker is used for generator transfer in the example, with line voltage operated
actuator coils. Momentary control signals are provided by the converter. The control pulse width
for this momentary type control systems 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 circuit breaker or contactor must be equipped with an auxiliary switch contact set--
closed when the main contacts are closed.
The generator voltage sense wires are used by the system to match the converter to the generator’s
frequency, voltage amplitude, and voltage phase-angle, and should be fused at the generator.
Generator transfer is initiated at the SHIP’S POWER button group. When transferring to generator,
the user must interactively select the appropriate generator using the metering button group. During
transfers from generator to converter, the GEN_CB_OPEN command will be issued to both
generator circuit breakers when the converter is placed on-line.
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