Kohler 33-125EFOZCJ, Installation Manual

Page: 74 / 84

TP-6862 6/14 74 Section 9 Paralleling Generator Sets
Step Potential Cause Explanation Troubleshooting
Fault: Generator Disabled Due to Reverse VARs
1 Different sized units The reactive power may overshoot when in
a power control situation such as a load
ramp or a quickly changing customer load.
It may be necessary to adjust the kVAR
load sharing gains.
2 Different automatic
voltage regulator settings
Setting the Engine Speed Adjust parameter
high on a generator will result in that
generator providing more real power than
the other generators. It is possible to drive
the other generators offline in light loading
conditions.
Set the voltage regulator average voltage
adjustment to the same value on all
connected generators.
3 Different voltage
calibrations
Because each generator will attempt to
match the target output voltage, generators
with incorrect calibration may be targeting a
different output voltage, thus generating or
absorbing VARs.
Verify the controller is measuring voltage
accurately, If not, re-calibrate.
4 Failure in voltage
regulator or activator
board
The generator breaker will trip to prevent
the generator from absorbing VARs from
the other generators. Providing power while
absorbing VARs may cause that alternator
to slip a pole—potentially damaging the
rotor or crankshaft.
Verify the voltage regulator and activator
are ok. Perform load tests to verify.
Fault: Generator Management Config Mismatch
1 Two generators that are
communicating on the
network have different
Order Selection modes
Generator management will not operate if
any generators on the PGEN network have
different Order Selection modes.
Adjust the Order Selection mode on any
generator on the network to set the Order
Selection mode in all controllers.
2 Two generators that are
communicating on the
network have different
Stability delays
Generator management will not operate if
any generators on the PGEN network have
different Stability delays.
Adjust the Order Selection mode on any
generator on the network to set the Stability
delay in all controllers.
3 Two generators that are
communicating on the
network have different
Redundancy
Requirements
Generator management will not operate if
any generators on the PGEN network have
different Redundancy Requirements.
Adjust the Order Selection mode on any
generator on the network to set the
Redundancy Requirements in all
controllers.
4 Two generators that are
communicating on the
network have different
Maximum Run Time
Hour Difference
Thresholds
Generator management will not operate if
any generators on the PGEN network have
different Maximum Run Time Hour
Difference Thresholds.
Adjust the Order Selection mode on any
generator on the network to set the
Maximum Run Time Hour Difference
Threshold in all controllers.
5 Two generators that are
communicating on the
network have different
Maximum Fuel Level
Difference Thresholds
Generator management will not operate if
any generators on the PGEN network have
different Maximum Fuel Level Difference
Thresholds.
Adjust the Order Selection mode on any
generator on the network to set the
Maximum Fuel Level Difference Threshold
in all controllers.