THOMSON TS 910 - Timer Bypass; TSC 9 Voltage Sensing; TSC 9 Generator Frequency Sensing

TS 910 TRANSFER SWITCH
PM140 REV 0 12/02/09 40 Thomson Technology
18.12. TIMER BYPASS
To bypass an active timing sequence (e.g. utility return timer, cool down timer, warm-up
timer) during operation, both faceplate pushbuttons (i.e. TEST & EXERCISE)) must be
held on for 2 seconds until all Lights on the faceplate start flashing.
18.13. TSC 9 VOLTAGE SENSING
The TSC 9 controller contains voltage sensing for each phase voltage of the utility and
generator supplies. The under voltage setting is for a falling utility voltage (i.e. “drop-
out” setting) on any one phase. The under voltage sensor will reset to normal when the
system voltage rises 10% above the “drop-out setting (i.e. differential value).
The under voltage drop-out set point for both utility and generator supplies is fixed at
70% of system voltage. The under voltage pick-up set point for both utility and
generator supplies is fixed at 80% of system voltage.
NOTE
To override momentary utility under voltage fluctuations, the TSC 9’s Engine
Start Delay Timer feature is utilized.
18.14. TSC 9 GENERATOR FREQUENCY SENSING
The TSC 9 controller contains frequency sensing for the generator supply. The under
frequency setting is for a falling generator frequency (i.e. “drop-out” setting). The under
frequency sensor will reset to normal when the system frequency rises 20% above the
“drop-out setting (i.e. differential value).
The under frequency drop-out set point for the generator supply is fixed at 70% of
system frequency. The under frequency pick-up set point for the generator supply is
fixed at 90% of system frequency.
NOTE
To override momentary under frequency fluctuations, the under frequency
sensor is provided with a transient time delay period of 3 seconds which is non-
adjustable.