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 milliseconds “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.
5.12.16. 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
expiry 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 (Gen)
power switching devices. These timers will be factory set for the specific ATS mechanism
type.
5.12.17. TIMER GUARD DELAY
The “Guard” Time delay is utilized for ATS mechanisms which contain separate open
and close coils to operate the power switching devices. The Guard time is the intentional
time delay in between the open and close signals from the TSC 900 controller during
transfer. This is to ensure there is adequate time for the “open” coil to successfully
release prior to initiating the signal to the associated “close” coil and vice versa. This
parameter will be factory set for the specific ATS mechanism type.
5.12.18. FIND NEUTRAL DELAY
For transfer switches equipped with type “S”, “T” or “M” operating mechanisms, the ATS
neutral position is obtained by powering the gear motor drive for a specific time period
to move the power switching device toggles to the open (i.e. “neutral”) position. The
“Find Neutral” timer is the setting in the TSC 900 controller period which controls the
length of time the ATS motor is powered during transfer to the neutral position. This
parameter will be factory set for the specific ATS mechanism type.
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