Technical Specifications

ASCO Power Technologies, Florham Park, New Jersey 07932 800-937-ASCO www.ascopower.com
01-2009 4 Publication xxxx
PART 3 OPERATION
3.01 Voltage and Frequency Sensing
A. The operating frequency shall be set at 60Hz nominal, with the option to change
operating frequency to 50Hz.
B. The voltage of each phase of the normal source shall be monitored, with pickup
(source acceptable) set at 198 volts, and dropout (source unacceptable) set at 187
volts. The option to change pickup to 209 volts, and to change dropout to 198, 176,
or 154 volts, shall be available.
C. The frequency of the alternate source shall be monitored with pickup (source
acceptable) set at 57 Hz, and dropout (source unacceptable) set at 51 Hz. For 50Hz
nominal operating frequency, the pickup and dropout will be set to 48Hz and 43 Hz,
respectively.
3.02 Time Delays
A. A time delay shall be provided to ignore preferred (utility) source outages, adjustable
to 1 or 3 second time periods.
B. A time delay shall be provided to ignore alternate (generator) source outages fixed
at 4 seconds.
C. A time delay shall be provided to transfer to alternate (generator) source fixed at 10
seconds.
D. A time delay shall be provided to retransfer to preferred (utility) source fixed at 5
minutes.
E. A time delay shall be provided for generator cooldown after retransfer to utility,
adjustable to 2 or 5 minute periods.
F. A generator exerciser and bypass switch shall be provided. An optional
programmable generator excerciser clock shall be available.
3.03 Additional Features
A. The controller shall provide one set of form C contacts to be used to signal the
generator to run. These contacts shall be rated at 1 A / 30 V dc or 5 A / 30 V dc.
B. A push-button type test switch shall be provided to simulate normal source failure.
C. A push-button type switch shall be provided to deactivate generator exerciser period.
D. Indicating lights shall be provided, one to indicate when the ATS is connected to the
normal source (green), and one to indicate when the ATS is connected to the
emergency source (red). Also provide indicating lights for both normal and
emergency source availability.
E. The option to connect communication and remote annunciation features to the
transfer switch controller shall be available.