TP-6126 8/0224 Section 3 Setup and Test
Note: Source N is the source connected to the normal
side of the contactor. Source E is the source
connected to the emergency side of the
contactor.
The voltage check procedure requires the following
equipment:
D A digital voltmeter (DVM) with electrically insulated
probes capable of measuring the rated voltage and
frequency
D A phase rotation meter
Hazardous voltage.
Will cause severe injury or death.
Only authorized personnel should
open the enclosure.
DANGER
Testing live electrical circuits. Hazardous voltage or
current can cause severe injury or death. Have trained and
qualified personnel take diagnostic m easurements of live
circuits. Use adequately rated test equipment with electrically
insulated probes and follow the instructions of the test
equipment manufacturer when performing voltage tests.
Observe the following precautions when performing voltage
tests: (1) Remove all jewelry. (2) Stand on a dry, approved
electrically insulated mat. (3) Do not touch the enclosure or
components inside the enclosure. (4) Be prepared for the
system to operate automatically.
(600 volts and under)
Voltage Check Procedure
Note: Perform voltage checks in the order given to
avoid damaging the transfer switch.
1. Verify that the generator set master switch is in the
OFF position and both power sources are
disconnected from the transfer switch.
2. Disconnect the power switching device and
controller wiring harnesses at the inline disconnect
plug, if they are connected.
3. Manually operate the transfer switch to position E.
See Section 2.4.
4. If Source N is a generator set, move the generator
set master switch to the RUN position. The
generator set should start.
5. Close the Source N circuit breaker or switch.
6. Use a voltmeter to check the Source N (normal)
phase-to-phase and phase-to-neutral (if
applicable) terminal voltages and frequency.
a. If Source N is the utility and the measured input
does not match the voltage and frequency
shown on the transfer switch nameplate,
STOP! Do not proceed further in installation
because the transfer switch is not designed for
the application—call your distributor/dealer to
order the correct transfer switch.
b. If Source N is a generator set and the generator
set output voltage and frequency do not match
the nominal system voltage and frequency
shown on the transfer switch nameplate, follow
the manufacturer’s instructions to adjust the
generator set. The automatic transfer switch
will only function with the rated system voltage
and frequency specified on the nameplate.
7. Use a phase rotation meter to check the phase
rotation at the Source N (normal) terminals.
Rewire the transfer switch Source N terminals to
obtain the correct phase sequence if necessary.
Note: The default setting for the phase rotation on
the controller is ABC. If the application uses
a phase rotation of CBA, use the Setup
Program to change the phase rotation
setting on the controller.
8. If the source is a generator set, stop the generator
set by moving the master switch to the OFF
position.
9. Disconnect Source N by opening upstream circuit
breakers or switches.
10. Manually operate the transfer switch to position N.
11. Repeat steps 4 through 8 for Source E. Then
proceed to step 17.
12. Disconnect both sources to the transfer switch by
opening the circuit breakers or switches.
13. Connect the power switching device and controller
wiring harnesses together at the inline disconnect
plug.
Note: Do not connect or disconnect the controller
wiring harness when the power is
connected.
14. Check the DIP switch settings. Verify that the
TEST DIP switch is in the loaded position before
proceeding with the next test.
15. Close and lock the transfer switch enclosure door.
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