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APPENDIX “A”
THOMSON TECHNOLOGY
©
TYPICAL AUTOMATIC TRANSFER SWITCH
COMMISSIONING PROCEDURES Model Series TS 870
iii) Green “Load” LED is “ON”
10) To verify all LED’s are operational, perform a “LAMP TEST” operation (lamp test is initiated by
pressing and holding the 2 push buttons on the TSC 80 faceplate simultaneously “ON” until all
the LED’s change state).
11) Prior to operating the generator, ensure it is ready to be energized and the site electrical
contractor and/or owner (as required) give authorization to proceed. In preparation for
operation, turn the generator’s engine control switch to the “Automatic” start position.
12) To transfer the generator on load, perform a load test by pressing the Utility Power Fail
Simulate pushbutton “ON” and holding it for approximately 5 seconds until the LED light above
the push button changes state. The engine should start following the 3-second engine start
delay period and the transfer switch will begin transferring to the generator supply once the 2-
second engine warm-up timer expires. Note: The engine warm-up timer will only begin timing
once the generator’s output rises above 85% nominal voltage and 90% nominal frequency.
Once the Utility power switching device opens, the transfer switch mechanism will pause in the
neutral position for the 3-second neutral delay period, then the mechanism will complete the
transfer and close the generator power switching device. To determine correct operation,
observe the following on the TSC 80 faceplate:
i) Generator Source green LED is “ON”
ii) Red LED above mimic bus for the generator source is “ON”
iii) Green “Load” LED is “ON”
iv) Utility Source green LED is “ON”
v) Utility Power Fail Simulate yellow LED is “ON”
vi) Green LED above mimic bus for the Utility source is “OFF”
13) To terminate the test, press the Utility Power Fail Simulate push button on the TSC 80 faceplate
again and hold until the LED above the pushbutton changes state. The transfer switch will
begin transferring to the utility supply following the 2-minute utility return delay period. Note:
the utility return delay timer will only begin timing if the utility voltage is above 85% nominal on
all phases. Once the Generator power switching device opens, the transfer switch mechanism
will pause in the neutral position for the 3-second neutral delay period, then the mechanism will
complete the transfer and close the Utility power switching device to return the load to the Utility
source. Once the load has transferred onto the utility source, the engine will continue to run for
the 2-minute cool down time delay period and will then it will automatically stop.
14) Perform a power outage test by opening the upstream utility feeder breaker. The TSC 80
controller Utility supply LED lights will de-energize; the generator set will start after the 3-
second engine start delay has expired. The generator should transfer on load as described in
item #12 above.
15) Return the transfer switch to utility power by re-closing the upstream utility breaker. The load
should re-transfer back to the utility supply and the engine should stop as described in item #13
above.
16) Repeat tests #12 through 14 two (or more) times to ensure correct operation.
17) Automatic Plant Exercise Operation (OPTIONAL): If an automatic weekly plant exercise feature
is desired, press the GENERATOR EXERCISE Mode push button on the TSC 80 faceplate.