TSC 900 TRANSFER SWITCH CONTROLLER
PM 151 REV 1 15/10/08 Thomson Power Systems
5.14.1. LOAD SHED POWER (kW) DELAY (PICKUP)
Select the desired load shed time delay setting. The setting is entered in seconds
within. If no delay is required, set this time delay to zero.
5.14.2. LOAD SHED POWER (kW) DROP OUT
Set to the desired load shed drop out set point as expressed in percentage of rated
generator power. The drop-out set point is the value which the internal sensor de-
energizes to a normal state when the load kW falls below the set point to cause a load
shed condition to be reset.
5.14.3. LOAD SHED POWER (kW) PICK UP
Set to the desired load shed pick-up set point as expressed in percentage of rated
generator power. The pick-up set point is the value which the internal sensor energizes
to an abnormal state when the load kW rises above the set point to cause a load shed
condition to be activated. A load shed condition will be triggered following expiry of the
load shed time delay setting.
5.14.4. LOAD SHED FREQUENCY PICK UP
Set to the desired load shed frequency pick-up set point as expressed in percentage of
nominal system frequency. The pick-up set point is the value which the internal sensor
energizes to a normal state when the load frequency rises above the set point to cause
a load shed condition to be reset.
5.14.5. LOAD SHED FREQUENCY DROP OUT
Set to the desired load shed frequency drop out set point as expressed in percentage
of nominal system frequency. The drop-out set point is the value which the internal
sensor de-energizes to an abnormal state when the load frequency falls below the set
point to cause a load shed condition to be activated. A load shed frequency condition
will be triggered following expiry of the load shed frequency time delay setting.
5.15. IN-SYNC TRANSFER SET POINTS
The TSC 900 controller provides set points for in-sync transfer applications. To program the in-
sync transfer features, refer to the following descriptions:
5.15.1. CLOSED TRANSITION MAX OVERLAP TIMER
For Closed Transition Transfer applications, the TSC 900 transfer controller includes
an adjustable time delay for the maximum allowable time the 2 sources can be
connected in parallel. If this time delay is exceeded, one of the pre-selected source
power switching devices will be automatically tripped open. In soft-load applications,
this time delay is bypassed. Set to the desired time in seconds.
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