TS 910 TRANSFER SWITCH
PM140 REV 0 12/02/09 52 Thomson Technology
APPENDIX A – TYPICAL AUTOMATIC TRANSFER SWITCH
COMMISSIONING PRIOCEDURES
a) Pre-Energization Checks
1. Verify the generator and utility supply voltages are 120/240V maximum.
2. Confirm power cable size is correct for the lugs supplied in the transfer switch
(line, load, and neutral) and are properly torqued.
3. Confirm transfer switch has been adequately grounded per NEC requirements.
4. Confirm power cables have been meggered to ensure no cross phase
connections or conduction to ground.
5. Check for mechanical damage.
6. Check no packaging materials or tools are left inside the transfer switch.
7. Verify control wiring connected to the pluggable terminal block is properly
installed (i.e. no frayed ends, screw are tight, no damage, etc).
8. Ensure TSC 9 Control Isolation Plug (J4) is inserted into the TSC 9 Controller
prior to operation.
9. Verify TSC 9 controller jumpers are set to reflect desired operation.
10. Visually verify the transfer switch power contactor is closed in the utility
position. The upper solenoid plungers will be pulled towards the upper coils
(refer to photos below).
‘ 100A/200A Contactor Utility Position 400A Contactor Utility Position
11. Verify correct control wire interconnects have been installed to the generator
set auto start/stop controls. Note: The ATS Engine Start contact CLOSES to
start the engine and OPENS to stop the engine.
12. Ensure the inside of the transfer switch is clean from all dust, and other foreign
materials.
13. Re-install enclosure door front cover and tighten all cover mounting screws.
14. Visually verify on the transfer switch enclosure that there are no gaps, holes,
or potential for water ingress.
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