Troubleshooting When Breaker Does Close To Bus; Faults Shown - Kohler 14EKOZD Installation Manual

9.5 Troubleshooting When Breaker Does Close to Bus

9.5.1

Faults Shown

Step Potential Cause
Fault: Close Attempt
Fault: Fail to Close
1 Breaker status feedback
is not valid, no bus
sensing
Fault: CB Status
1 Breaker status feedback
is not connected
2 Breaker status is short
circuited
3 Breaker status feedback
is connected to the
wrong contacts
4 Breaker status feedback
is connected to a
latching contact
Fault: Bus Phase Rotation Mismatch
1 All of the bus sensing
wires are incorrectly
connected
2 The phase connections
on the paralleling
breaker are inconsistent
with the generator
3 Generator sensing is
connected incorrectly
4 Breaker to bus wiring is
inconsistent
66 Section 9 Paralleling Generator Sets
Explanation
The breaker closes but the controller does
not see a change in status. The controller
cannot see the bus is energized as the bus
sensing is not connected correctly on any
generators on the network.
The breaker closes but the controller does
not see a change in status. The controller
sees the bus is now live.
The controller sees the breaker is closed
even when it is not trying to open it.
The controller sees open status for the
breaker after telling it to close, closed
status after telling it to open.
The breaker status indicated that it closed
when it was triggered to close but it did not
indicate that it was open when the breaker
opened. This fault will only occur if the bus
sensing is connected correctly (the
controller sees the voltage go to 0 when
the breaker is triggered to open).
The bus sensing wires must be connected
to phase A, phase B, and phase C of the
bus. If any two connections are reversed,
the controller can detect the reversed
connections. This fault will only occur if all
three wires are incorrectly connected.
The power leads from the generator to the
paralleling circuit breaker must be
connected consistently. Phase A from the
generator must go to phase A of the line
side of the paralleling (motor operated)
breaker, phase B from the generator to
phase B of the breaker and phase C of the
generator to phase C of the breaker.
The controller measurement leads are not
connected to the appropriate output phases
or the phases are incorrectly labeled.
In applications where the bus sensing is
taken from a location other than the load
side of the paralleling breaker, it is possible
to connect the wiring incorrectly between
the load side of the output breaker and the
paralleling bus.
Troubleshooting
Verify the wiring on the circuit breaker to
ensure that it is connected correctly. Verify
bus wiring for all nodes. Verify the
generator output is connected to the line
side of the generator breaker.
Verify the wiring on the circuit breaker to
ensure that it is connected correctly.
Verify connection of the breaker status
wiring at the circuit breaker.
The controller is expecting the breaker
status to be an "A" contact. Verify the
circuit breaker auxiliary contacts are either:
11 and 14
21 and 24
31 and 34 or
41 and 44.
If the breaker status contacts are
removable, make sure that they are
inserted in one of the OF slots and that the
wires go to 1 and 4.
Verify the breaker status input to the
controller is connected directly to an
auxiliary contact on the circuit breaker.
Verify the bus metering connections.
Verify the output cable connections.
Verify the sensing leads from the controller
are connected to the appropriate output
leads from the generator. L1 should
connect to phase A, L2 to phase B, L3 to
phase C, L0 to neutral.
Verify the cable connections from the
paralleling breaker to the paralleling bus.
TP-7045 3/18c