TSC 900 TRANSFER SWITCH CONTROLLER
PM 151 REV 1 15/10/08 Thomson Power Systems
timer is provided for each source (i.e. Source 1 (Utility) and Source 2 (Gen) power
switching devices.
5.11.18. TRIP RETRY DURATION TIMER (SRC1&2)
The “Trip Retry Duration Timer” 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 open for any reason, the TSC 900 will attempt to re-open it by providing
an on/off pulse signal. If a retry is unsuccessful, the TSC 900 will continue retrying until
expirary of the Trip Retry Duration Timer. The Trip Retry Duration Timer will be factory
set to allow 3 retry attempt cycles to occur. Based on a Retry Pulse timer setting of 100
milliseconds a Trip Retry Duration Timer is set for 600 milliseconds (i.e. (100
milliseconds On pulse + 100 milliseconds Off pulse) x 3 cycles). One Trip Retry
Duration Timer is provided for each source (i.e. Source 1 (Utility) and Source 2 (Gen)
power switching devices. These timers will be factory set for the specific ATS
mechanism type.
5.11.19. CLOSE RETRY ON/OFF PULSE TIME (SRC1&2)
The “Close 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 close for any reason, the TSC 900 will attempt to re-
close it by providing an on/off pulse signal. The duration of the on/off pulse signal is set
by the Close Retry On/Off Pulse Time setting. The Close 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 Close Retry ON/OFF pulse
timer is provided for each source (i.e. Source 1 (Utility) and Source 2 (Gen) power
switching devices.
5.11.20. CLOSE RETRY DURATION TIMER (SRC1&2)
The “Close Retry Duration Timer” 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 close for any reason, the TSC 900 will attempt to re-close it by
providing an on/off pulse signal. If a retry is unsuccessful, the TSC 900 will continue
retrying until expirary of the Trip Retry Duration Timer. The Close Retry Duration Timer
will be factory set to allow 3 retry attempt cycles to occur. Based on a Retry Pulse timer
setting of 100 milliseconds a Close Retry Duration Timer is set for 600 milliseconds
(i.e. (100 milliseconds On pulse + 100 milliseconds Off pulse) x 3 cycles). One Close
Retry Duration Timer is provided for each source (i.e. Source 1 (Utility) and Source 2
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