Product Manual

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©2007|Cummins Power Generation Inc.|All rights reserved|Specifications subject to change without notice|Cummins Power Generation,
Onan and Cummins are registered trademarks of Cummins Inc. PowerCommand and “Our energy working for you.” are trademarks of
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A-1535b (1/08)
PowerCommand
®
microprocessor control
• Simple, easy-to-use control provides transfer switch information and operator
controls
• LED lamps for source availability and source connected indication, exercise
mode, and test mode. LED status lamps also provided for control set-up and
configuration.
• Control pushbuttons to initiate test, override time delays, and set exercise time.
• Integral exerciser clock
• Control is prototype-tested to withstand voltage surges per EN 60947-6-1.
• Gold-flashed generator start contacts
Control functions
Voltage sensing: All phases on the normal source and single phase on generator source. Normal Source Pickup:
adjustable 90-95%, Dropout: adjustable 70-90% of nominal voltage; Generator Source Pickup: 90%, dropout: 75% of
nominal voltage.
Frequency sensing: Generator Source Pickup: 90% of nominal frequency; Dropout: 75% of nominal frequency.
Exerciser clock: Switch is furnished with an integral engine exerciser configurable for operation on a 7, 14, 21, or 28-
day cycle with a fixed exercise period duration of 20 minutes. A 12-hr exerciser time offset allows for the convenient
setting of exercise time without the need to activate the timer. Software selectable capability allows for the exercising of
the generator with or without load.
Time-delay functions
Engine start: Prevents nuisance genset starts due to momentary power system variation or loss. Adjustable: 0-10
seconds; default: 3 seconds.
Transfer normal to emergency: Allows genset to stabilize before application of load. Prevents power interruption if
normal source variation or loss is momentary. Adjustable 0-300 seconds, default 5 seconds.
Retransfer emergency to normal: Allows the utility to stabilize before retransfer of load. Prevents needless power
interruption if return of normal source is momentary. Adjustable 0-30 minutes, default 10 minutes.
Genset stop: Maintains availability of the genset for immediate reconnection in the event that the normal source fails
shortly after transfer. Allows gradual genset cool down by running unloaded. Adjustable 0-30 minutes, default 10
minutes.