TSC 80 TRANSFER SWITCH CONTROLLER
PM063 Rev 7 09/02/27
Thomson Technology
16
numbers 38 & 42. The TSC 80 controller will not verify that the
transfer mechanism has operated correctly.
3.1.2.4.TRANSFER FAIL DETECTION-NORMAL STEADY STATE
CONDITION (NON-TRANSFERRING)
i. Limit Switch Failure (i.e. open contact) - Transfer Fail Alarm is initiated
(Load on Source Flashing LED) after 9 second delay, and then a forced
transfer to the alternate source is initiated. Re-transfer back to the original
source will not occur until the Transfer Fail alarm condition is reset. Refer
to item 3.3 for Transfer Fail Fault Reset details.
ii. Loss of Load Voltage (<80VAC) (i.e. Power switching device Tripped
Condition) - Transfer Fail Alarm is initiated (Load Source Flashing LED)
after 5 second delay, then a forced transfer to the alternate source is
initiated. Re-transfer back to the original source will not occur until the
Transfer Fail alarm condition is reset. Refer to item 3.3 for Transfer Fail
Fault Reset details.
iii. Limit Switch Failure & Loss of Load Voltage <80VAC - Transfer Fail Alarm
is initiated (Load Source Flashing LED) after
11
second delay, then a
forced transfer to the alternate source is initiated. Re-transfer back to the
original source will not occur until the Transfer Fail alarm condition is reset.
Refer to item 3.3 for Transfer Fail Fault Reset details.
3.1.2.5.TRANSFER FAIL DETECTION - TRANSFERRING CONDITION
Transfer Source to Neutral – “NEUTRAL POSITION TIME” (10 seconds-
adjustable with SDM) starts timing as soon as a transfer to the alternate source
is initiated. During this period the ATS motor is energized and moves the
mechanism from the original source to neutral. The power to the motor will be
de-energized when either the “NEUTRAL POSITION TIME” times out or the
load voltage drops below 80VAC on all phases (whichever occurs first). Once
the ATS motor is de-energized, the Neutral Delay timer starts timing. Once the
Neutral Delay timer times out the motor re-energizes to continue the transfer
(see below).
Note
: Normally the load voltage will typically drop below the
setpoint within 1 second when the source power switching device opens and
therefore the “NEUTRAL POSITION TIME” never times out. The default setting
of this timer (10 seconds) is intentionally set long so that it will not pre-maturely
stop the ATS mechanism.
Summary of Contents for TSC 80
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