TP-7045 3/18c
68 Section 9 Paralleling Generator Sets
Step Potential Cause
Explanation
Troubleshooting
Fault: Bus Sensing Phases A and B are Reversed
1
The bus sensing for
phase A is connected to
phase B of the
paralleling bus and vice
versa
Phase angle from generator to bus is about
180
_
and bus rotation is backwards.
Verify wiring between bus sensing inputs
and load side of paralleling breaker.
2
The wiring between the
generator and the
paralleling breaker is
incorrect
Phase angle from generator to bus is about
180
_
and bus rotation is backwards.
Verify wiring between generator and
paralleling breaker.
3
The generator metering
is not connected
correctly
Phase angle from generator to bus is about
180
_
and bus rotation is backwards.
Verify metering connections on the
generator. L1 should connect to the
phase A output lead. L2 to phase B, L3 to
phase C, L0 to neutral.
Fault: Bus Sensing Phases B and C are Reversed
1
The bus sensing for
phase B is connected to
phase C of the
paralleling bus and vice
versa
Phase angle from generator to bus is about
--120
_
and bus rotation is backwards.
Verify wiring between bus sensing inputs
and load side of paralleling breaker.
2
The wiring between the
generator and the
paralleling breaker is
incorrect
Phase angle from generator to bus is about
--120
_
and bus rotation is backwards.
Verify wiring between generator and
paralleling breaker.
3
The generator metering
is not connected
correctly
Phase angle from generator to bus is about
--120
_
and bus rotation is backwards.
Verify metering connections on the
generator. L1 should connect to the
phase A output lead. L2 to phase B, L3 to
phase C, L0 to neutral.
Fault: Bus Sensing Phases C and A are Reversed
1
The bus sensing for
phase A is connected to
phase C of the
paralleling bus and vice
versa
Phase angle from generator to bus is about
120
_
and bus rotation is backwards.
Verify wiring between bus sensing inputs
and load side of paralleling breaker.
2
The wiring between the
generator and the
paralleling breaker is
incorrect
Phase angle from generator to bus is about
120
_
and bus rotation is backwards.
Verify wiring between generator and
paralleling breaker.
3
The generator metering
is not connected
correctly
Phase angle from generator to bus is about
120
_
and bus rotation is backwards.
Verify metering connections on the
generator. L1 should connect to the
phase A output lead. L2 to phase B, L3 to
phase C, L0 to neutral.
Fault: Bus Sensing Not Connected
1
No wires connect the
bus sensing on the
generator to the load
side of the paralleling
breaker
Wiring not connected between load side of
the paralleling breaker and the bus
metering.
Verify that the bus sensing is connected.
2
No leads connect the
generator output to the
line side of the
paralleling breaker
The leads connecting the output of the
generator to the paralleling breaker are not
connected.
Verify that the leads connecting the
generator to the paralleling breaker are
connected.
3
The line circuit breaker is
open
The line circuit breaker (at the generator) is
open, disconnecting the output from the
generator from the line side of the
paralleling breaker.
Verify that the line circuit breaker is closed.
Summary of Contents for 12EFKOZD
Page 2: ...TP 7045 3 18c 2...
Page 8: ...TP 7045 3 18c 8 Safety Precautions and Instructions Notes...
Page 12: ...TP 7045 3 18c 12 Section 2 Location Lifting and Mounting Notes...
Page 24: ...TP 7045 3 18c 24 Section 4 Exhaust System Notes...
Page 28: ...TP 7045 3 18c 28 Section 5 Fuel System Notes...
Page 34: ...TP 7045 3 18c 34 Section 6 Electrical System Notes...
Page 50: ...TP 7045 3 18c 50 Section 7 Installation Drawings Notes...
Page 54: ...TP 7045 3 18c 54 Section 8 Reconnection Figure 8 3 Generator Reconnection ADV 5875F U...
Page 81: ...TP 7045 3 18c 81...
Page 82: ...TP 7045 3 18c 82...
Page 83: ...TP 7045 3 18c 83...