TSC 80e TRANSFER SWITCH CONTROLLER
PM091 Rev 1 09/02/27 Thomson Technology
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4.6.8. GENERATOR VOLTAGE & FREQUENCY SETPOINTS
The TSC 80e controller provides 3-phase under voltage sensing and under frequency
sensing on the Generator supply. Each sensor is individually programmable for pickup
and dropout voltage setpoints (i.e. adjustable hysteresis). To program the voltage and
frequency sensing features, refer to the following descriptions:
4.6.8.1.Generator Under Voltage Drop Out
Set to the desired generator under voltage setpoint at which the internal voltage
sensor drops out (i.e. the sensor de-energizes to an abnormal state when any
one of the generator phase voltages is below the setpoint). The setting is
entered based on a phase-to-phase voltage percentage within a range of 70%
to 95% of nominal system voltage. NOTE: The difference between the pickup
and dropout setting is considered the dead band or hysteresis value.
4.6.8.2.Generator Under Voltage Pick Up
Set to the desired generator 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 generator phase voltages are above the setpoint). The setting is entered
based on a phase-to-phase voltage percentage within a range of 75% to 100%
of nominal system voltage. NOTE: The difference between the pickup and
dropout setting is considered the dead band or hysteresis value.
4.6.8.3.Generator Under Frequency Drop Out
Set to the desired generator under frequency setpoint at which the internal
frequency sensor drops out (i.e. the sensor de-energizes to an abnormal state
when the generator frequency is below the setpoint). The setting is entered in
a percentage value within a range of 70-90%.
4.6.8.4.Generator Under Frequency Pick Up
Set to the desired generator under frequency setpoint at which the internal
frequency sensor drops out (i.e. the sensor de-energizes to an abnormal state
when the generator frequency is below the setpoint). The setting is entered in
a percentage value within a range of 70-90%.
4.6.9. SYSTEM TIMING DELAYS
The TSC 80e provides control and timing delay logic specific to the operation of the
utility and generator, these are:
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