TP-6953 7/19 143Section 7 Troubleshooting
Symptom Potential Causes Troubleshooting
Phase angle fault
The bus wiring is not connected
correctly on the load side of the
generator paralleling breaker.
Verify bus measurement wiring.
The paralleling breaker is indicating
closed when it is actually open.
Verify breaker status accuracy by w atching the status on the screen and manually operating the breaker while no generators
in the paralleling system are running.
Breaker current fault
The generator has loads that are
attached on the generator side of
the paralleling breaker.
All loads fed by the generator should be connected downstream of the paralleling breaker. If a fire pump breaker is required,
the current fault should be adjusted to accommodate the fire pump current.
The generator breaker is closed, but
is indicating open.
Verify breaker status accuracy by w atching the status on the screen and manually operating the breaker while no generators
in the paralleling system are running.
Failure to
synchronize
The load is changing too frequently
to synchronize.
Observe the frequency and voltage of the paralleling bus to ensure that they are are not changing too quickly. If so, try to find
which load are causing the problem and inhibit them from receiving power until more generators are online (if possible).
The synchronizing gains are not
calibrated correctly.
Some application may require adjustment of the paralleling gains.
Close attempt fault
(Fail to Close Delay:
Device Out of Order)
but no Failure to
Close
First-On close delay or Dwell Time
is too short.
Ensure that the trip relay is energizing enough before the close relay energized to remove any inhibiting mechanism tied to
the trip coil.
External protection inhibiting
breaker closure.
If 3rd-party protective relays are used for permissive functions, ensure that the window on the protective relays is wider than
the window on the controller. If the protective relay is not changeable, adjust the controller to be tighter than the protective
relay.
Intermittent wiring to circuit breaker. Check wiring to circuit breaker to ensure that all connections are tight.
Failure to Close (Max
Close Attempts:
High)
Remove Breaker Trip not configured
to Digital Output 115 or Digital
Output 115 not enabled.
Verify configuration in SiteTech for Digital output 115.
Close Breaker not configured to
Digital Output 116 or Digital Output
116 not enabled.
Verify configuration in SiteTech for Digital output 116.
No power supply to circuit breaker. Verify that charge motor operates on motor-operated breaker.
Incorrect wiring between terminal
block and breaker relays.
Make sure that trip and close r elays operate properly. Changing the event for digital output 115 and 116 to not in auto will
allow for simpler troubleshooting, as pressing the off button will signal the breaker to close and pressing the auto button will
signal the breaker to trip.
Note: Make sure that Digital outputs 115 and 116 are set back to r emove breaker trip and close breaker with troubleshooting
is complete.
Incorrect wiring between terminal
block and circuit breaker.
Verify the wiring between the circuit breaker and the break er close relay.
No status feedback from circuit
breaker and no bus sensing
connected.
Verify that bus sensing is connected to load side of the circuit breaker. Verify the breaker status wiring is connected correctly.
SDE contact not installed correctly. Some circuit breakers require a contact in the SDE position of the circuit breaker in order for the motor operator to operate
correctly. Verify that the SDE contact is installed per the wiring diagram for the breaker.
Failure To Open (Fail
to Open Delay:
Device Out of Order)
Trip wiring not installed or
connected incorrectly.
Verify the wiring between the circuit breaker and the breaker trip relay.
Breaker status wired to incorrect
terminals.
The breaker status feedback (BSP and BSN) should be connected to terminals 1 and 4 (11 and 14) of the circuit breaker.
Continued breaker
cycling
No breaker s tatus feedback with
bus sensing connected.
Verify the breaker status wiring is connected correctly.
Remove breaker trip is not wired to
the normally closed contact on the
relay.
Verify that breaker trip relay is wired per the wiring diagram.
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