TP-6447 10/1224 Section 3 Functional Tests
3. 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.
4. 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 BAC, use the Source
Setup screen to change the phase rotation
setting on the controller.
5. If the source is a generator set, stop the generator
set by moving the master switch to the OFF
position.
6. Disconnect Source N by opening upstream circuit
breakers or switches.
7. Repeat steps 1 through 5 for Source E. Then
proceed to step 8.
8. Disconnect both sources to the transfer switch by
opening the circuit breakers or switches.
9. Close and lock the transfer switch enclosure door.
10. Reconnect both power sources by closing the
circuit breakers or switches.
11. Move the generator set master switch to the AUTO
position.
Note: If the engine cooldown time delay setting is
not set to zero (default setting), the
generator set may start and run until the
Time Delay Engine Cooldown (TDEC) ends.
12. Perform the lamp test and then proceed to the
automatic operation test.
3.4 Lamp Test
Refer to the controller Operation Manual for instructions
to perform a lamp test. Verify that all controller LEDs or
lamps light during the test.
3.5 Automatic Operation Test
Check the transfer switch’s automatic control system
immediately after the voltage check. Refer to the
controller Operation Manual for instructions to run the
automatic operation test.
Note: Close and lock the enclosure door before starting
the test procedure.
This completes the functional tests.
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