TP-6461 1/0842 Section 3 Transfer Switch Troubleshooting
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 Set
Sources screen to change the phase
rotation setting on the controller. See the
Operation/Installation Manual for
instructions.
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 12.
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. Close and lock the transfer switch enclosure door.
15. Reconnect both power sources by closing the
circuit breakers or switches.
16. 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.
3.4 Contacts
Use the millivolt drop test in Section 1.3.3 to identify
damaged contacts. If the contacts are damaged or have
high resistance, replace the power panel assembly. See
the table of contents for service procedures for your
transfer switch.
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