TSC 900 TRANSFER SWITCH CONTROLLER
PM 151 REV 1 15/10/08 Thomson Power Systems
energize “x” seconds prior to a load transfer based on the setting of the pre-transfer
delay timer. The pre-transfer output relay will stay energized until the post-transfer
delay time commences. If no delay is required, set this time delay to zero.
5.11.13. TRANSFER POST DELAY (LDC)
Immediately following a transfer in either direction, a post-transfer timer will start timing
and the post-transfer output relay will energize. Once the post-transfer delay timer
expires the post-transfer output relay will de-energize. If no delay is required, set this
time delay to zero.
5.11.14. DISCONNECTION RESUME TIME
When the TSC 900 is signaled to return to an Automatic mode of operation, it will
suspend any actions for the time setting of the DISCONNECTION RESUME timer to
allow for operation states, alarms etc, to resume normal operation. This timer will be
factory set for the specific ATS mechanism type.
5.11.15. LOAD SHED INITIATE DELAY
Once a transfer to Generator (SRC 2) condition is initiated, the Load Shed output will
be activated to shed non-essential load and the Load Shed Initiate time period will start
timing. Once the set time period expires, the Load shed output will reset to allow the
non-essential loads to be re-energized (i.e. reset to normal). Select desired time in
seconds. If no delay is required, set this time delay to zero.
5.11.16. LOAD SHED UNSHED DELAY
If a Load Shed condition had been activated by an abnormal set point threshold (i.e.
under frequency or over power) and the condition returns to normal, the Load Shed
Unshed time period will start timing. Once the set time period expires, the Load shed
output will reset to allow the non-essential loads to be re-energized (i.e. reset to
normal). Select desired time in seconds. If no delay is required, set this time delay to
zero.
5.11.17. TRIP RETRY ON/OFF PULSE TIME (SRC1&2)
The “Trip Retry On/Off Pulse Time” feature is utilized for ATS mechanisms which
contain separate open and close coils to operate the power switching devices. When a
power switching device fails to trip open for any reason, the TSC 900 will attempt to re-
open it by providing an on/off pulse signal. The duration of the on/off pulse signal is set
by the Trip Retry On/Off Pulse Time setting. The Trip Retry On/Off Pulse Time will be
factory set for 100 milliseconds. Note: The duration of each on and off pulse signal is
symmetrical (e.g. a Pulse time setting of 100 milliseconds will provide a 100
millisecond “on” pulse and 100 millisecond “off” pulse. One Trip Retry ON/OFF pulse
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