THOMSON TSC 800 - V2.1 - Phase Balance Retransfer; Voltage Sensing; Utility under Voltage Sensor Pickup

TSC 800 TRANSFER SWITCH CONTROLLER
PM 049 REV 9 06/04/24 Thomson Technology
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7.3.17. PHASE BALANCE RETRANSFER
NOTE:
The following feature is provided in TSC 800 Software version 2.1 (or
higher).
When the phase balance feature is enabled, this programming prompt will affect
operation of the retransfer sequence following an abnormal phase balance condition.
Two retransfer modes of operation are selectable as follows:
AUTO: The controller will automatically initiate a retransfer sequence once the
original sources phase balance condition returns within nominal limits as
programmed.
NOTE:
The AUTO mode is the factory default setting for this feature.
MAN: The controller will not automatically initiate a retransfer sequence following a
phase balance alarm condition. To initiate a re-transfer sequence, an operator
must manually reset the phase balance alarm condition by pressing the LAMP
TEST function on the controller faceplate (i.e. press and hold the DECREMENT
& INCREMENT keys simultaneously until the condition is reset.
7.4. VOLTAGE SENSING
The TSC 800 controller provides 3-phase over voltage and under voltage sensing on
both utility and generator supplies. Each sensor is individually programmable for pickup
and dropout voltage setpoints (i.e. adjustable hysteresis) in addition to transient time delay
settings. The TSC 800 controller also provides under and over frequency sensing on both
utility and generator supplies. Each sensor is individually programmable for pickup and
dropout frequency setpoints (i.e. adjustable hysteresis) in addition to transient time delay
settings. To program the frequency sensing features, refer to the following descriptions:
To program the voltage and frequency sensing features, refer to the following descriptions:
7.4.1. UTILITY UNDER VOLTAGE SENSOR PICKUP
Set to the desired utility under voltage setpoint at which the internal voltage sensor
picks up (i.e. the sensor energizes to a normal state when all phases of the utility
phase voltages are above the setpoint). The setting is entered based on a phase-to-
phase voltage value within a range of 70% to 99% of nominal system voltage. NOTE: