Spec Sheet

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Specifications are subject to change without notice.
SG-1478j (6/09)
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
• Pushbutton controls for initiating test, overriding time delays and setting
exercise time
• Field-configurable for open or programmed transition
• Integral exerciser clock
• Control is prototype-tested to withstand voltage surges per EN 60947-6-1
• Gold-flashed generator start contacts
Control functions
Under-voltage sensing: All phases on the normal source,
and single phase on generator source.
Normal source pickup: adjustable 80-95%
Dropout: adjustable 70-90% of nominal voltage
Generator source pickup: 90%
Dropout: 75% of nominal voltage.
Over-voltage sensing: All phases on the normal source.
Source pickup: 120%
Dropout: 125%
Under-frequency sensing: Default setting is OFF.
Generator source pickup: 90% of nominal frequency
Dropout: 85% of nominal frequency
Normal source pickup: 80%
Dropout: 70%
Over-frequency sensing: Default setting is OFF
Normal source pickup: 130%
Dropout: 140%.
Genset-to-genset sensing: Same functions as above, for
lead and secondary generators.
Exercise mode: The control exerciser clock can be set to
operate on a 7, 14, 21 or 28-day cycle with a fixed exercise
period duration of 20 minutes. A convenient 12-hour offset
feature offsets the exercise time by 12 hours, without having
to reprogram the timer. The control can be programmed to
exercise the generator with or without load.
Test mode: When manually or remotely activated from the
control panel, the control will start the generator and run
until stopped. Can be configured to test with or without load.
Transition modes
Open transition/programmed: Controls the time
required for the device to switch from source to source, so
that the load-generated voltages decay to a safe level before
connecting to an energized source. Recommended by
NEMA MG-1 to prevent nuisance-tripping breakers and load
damage.
Adjustable 0-10 seconds, default 0 seconds.
Open transition/in-phase: Initiates open transition
transfer when in-phase monitor senses both sources are in
phase. Operates in a break-before-make sequence. Includes
ability to enable programmed transition as a back-up. If
sources are not in phase within 120 seconds, the system will
transfer using programmed transition.
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.
Allows staggered transfer of loads in multiple transfer
switch systems. For genset-to-genset applications, delays
transfer of load from lead to secondary generator.
Adjustable 0-300 seconds, default 5 seconds.
Re-transfer emergency to normal: Allows the utility to
stabilize before re-transfer of load. Prevents needless
power interruption if return of normal source is momentary.
Allows staggered transfer of loads in multiple transfer
switch systems. For genset-to-genset applications, delays
re-transfer of load from secondary back to lead generator.
Adjustable 0-30 minutes, default 10 minutes.
Engine stop: Maintains availability of the genset for
immediate reconnection if the normal source fails shortly
after transfer. Allows gradual genset cool down by running
unloaded.
Adjustable 0-30 minutes, default 10 minutes.
Elevator signal relay: Requires optional elevator signal
relay (M032). Delays transfer for specified interval to
prevent a power interruption during elevator operation.
Options
Elevator signal relay: Provides relay output contacts
for sending a load-disconnect warning signal to the
elevator control. Transfer/re-transfer delay time is
selectable for 0, 1, 2, 3, 5, 30, 120 or 300 seconds. (M032).
Programmable exerciser clock: Provides a fully-
programmable 7-day clock to provide greater flexibility in
scheduling exercise periods than standard integral
exerciser. Peaking function feature allows for generator
operation during periods of high utility rates. (J030)
Manual restore: Provides a key switch on the front door
to allow the operator to control when the switch transfers
to the available normal source.