Kohler 33-125EFOZCJ, Installation Manual

Page: 73 / 84

TP-6862 6/14 73 Section 9 Paralleling Generator Sets
Step Potential Cause Explanation Troubleshooting
Fault: Generator Disabled Due to High Frequency
1 Attempting to operate a
generator in base-load
mode while it is
connected to a variable
load
The speed bias and voltage bias control
real and reactive load in base-load mode
against a source with a nearly constant
frequency and voltage (such as a utility
source). If the generator is disconnected
from the utility source, the speed and
voltage will deviate to either extreme of the
bias range, depending on the target load
and the actual load.
Install contacts in series with the base-load
mode input to the controller which are
disconnected when the utility source is
disconnected from the paralleling bus.
Fault: Generator Disabled Due to Low Frequency
1 Attempting to operate a
generator in base-load
mode while it is
connected to a variable
load
The speed bias and voltage bias control
real and reactive load in base-load mode
against a source with a nearly constant
frequency and voltage (such as a utility
source). If the generator is disconnected
from the utility source, the speed and
voltage will deviate to either extreme of the
bias range, depending on the target load
and the actual load.
Install contacts in series with the base-load
mode input to the controller which are
disconnected when the utility source is
disconnected from the paralleling bus.
Fault: Generator Disabled Due to Over Power
1 Continuous overload The generator breaker will trip to protect
the generator from damage due to
excessive loads.
Ensure that the load is low enough for a
single generator to support it.
Fault: Generator Disabled Due to Reverse Power
1 Loss of fuel pressure The generator breaker will trip to prevent
generator operation. Otherwise, power
could be absorbed from other generators
causing potential damage to the fuel
system by operating without lubrication.
Ensure that the generator has sufficient
fuel to support load. Connect a fuel level
sensor and place Generator Management
in Fuel Level Equalization mode.
2 Quick ramp rate settings The real power may overshoot when in a
real power control situation such as base
load or system control.
It may be necessary to adjust the load
control gains.
3 Different sized units or
units of different fuel
types.
The real power may overshoot when in a
real power control situation such as a load
ramp or a quickly changing customer load.
It may be necessary to adjust the kW load
sharing gains.
4 Different engine speed
adjust 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 engine speed adjustment similarly
on all generators.
Fault: Generator Disabled Due to Over Current
1 Excessive reactive load The generator breaker will trip to prevent
the generator from damage due to
excessive stator current. Note, the
controller also has a heat-model-based
alternator protection algorithm (which will
shut the generator down).
Ensure that the load is low enough for a
single generator to support it.