Capstone Turbine Corporation
Model C65 Hybrid UPS User’s Manual
Page
50 of 66 400027 Rev A (July 2010)
Capstone reserves the right to change or modify, without notice, the design, specifications, and/or contents of this document without
incurring any obligation either with respect to equipment previously sold or in the process of construction.
Under Frequency Submenu
Load Output 3/4
Under Frequency 5/8
45.0 Hz
10.00 Sec
CAUTION
Adjusting the Load Output under frequency setting above the Utility Input
under frequency setting may result in
disconnecting power from the critical load when the Utility grid frequency
drops. Only adjust the Load Output under frequency to a value less than
the Utility Input under frequency setting.
Under Frequency submenu shows the system under frequency and associated delay time.
If the output frequency falls below this under frequency setpoint for the set delay time, the
system will shut down. The frequency is adjustable from 45 to the nominal output
frequency in 0.1 Hz increments. Initial Factory Setting is 45 Hz.
Under Frequency Delay is the time span allowed for output frequency to fall below Under
Frequency (Hz) before the system will shut down. This is adjustable from 0.01 to 10
seconds in 0.01 second increments. Initial Factory Setting is 10 seconds.
Note that the output frequency is synchronized with the input utility grid during normal
operation. Therefore, the Load Output under frequency setpoints should be less than the
Utility Input under frequency setpoints to assure coordinated response to utility frequency
shifts.
Over Frequency Submenu
Load Output 3/4
Over Frequency 6/8
65.0 Hz
10.00 Sec
CAUTION
Adjusting the Load Output over frequency setting below the Utility Input
under frequency setting may
result in the Hybrid UPS system
disconnecting power from the critical load when the Utility grid frequency
increases. Only adjust the Load Output over frequency to a value greater
than the Utility Input over frequency setting.
Over Frequency submenu shows the system over frequency and associated delay time. If
the output frequency rises above this over frequency setpoint for the set delay time, the
system will shut down. The frequency is adjustable from 65 Hz down to the nominal output
frequency, in 0.1 Hz increments. Initial Factory Setting is 65 Hz. If the output frequency
exceeds the Over Frequency setting for the time delay setting, the system will shut down.
The time delay is adjustable from 0.01 to 10 seconds in 0.01 second intervals. Initial
Factory Setting is 10 seconds.
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