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TP-6804 1/15 29Section 2 Generator Set Operation
Fault Text Description Possible Causes *
ErraticSig The power metering on this controller gives a signal
that is not consistent with the system configuration.
Reversing the power direction does not resolve the
problem.
Bad wiring to the CT.
Too much tension on wires from the CT to
the controller.
LossOfComAPM The Automatic Paralleling Module has stopped
communicating on RBUS. (An APM was detected on
the RBUS network but is no longer communicating.)
APM is unplugged.
Primary controller is powered down.
Check the battery connections. See
previous page for more information.
Intermittent connections on RBUS network
wiring. Check RBUS communication
connections.
LossOfComm2 The primary controller has lost communication with the
secondary controller. (A secondary controller was
detected, then communication was lost.)
RBUS disconnected, secondary controller
battery disconnected, updating firmware in
secondary controller, or intermittent RBUS
connections.
LossOfField This generator has absorbed more than 25% reactive
power (magnetic excitation current) for 20 seconds
Generator voltage on this generator is not
calibrated correctly.
Generator voltage on other generator is
not calibrated correctly.
Bus voltage on this generator is not
calibrated correctly.
Bus voltage on the other generator is not
calibrated correctly.
MeteringOk The generator has verified that the metering is
connected correctly and that the direction is consistent
with expected power direction.
Status message indicates that the CT is
connected to the generator correctly.
MeterUnknown This generator does not know if the metering is
connected or the orientation of the connection. This
means that the generators can’t share load accurately
until this information is known.
System commissioning and startup not yet
complete. See TT-1596.
NoCurrent The generator has applied l oad (using the other
generator) and has observed no current on the power
sensing inputs.
The CT is not connected to the controller.
The output leads from the generator do
not go through the CT in the correct
direction. See TT-1596.
SyncFailure The generator has been attempting to synchronize for
over 2 minutes without success.
Generator is hunting.
Advanced speed control settings need
adjustment.
Load is changing frequently to disturb the
online generator.
* For paralleling system troubleshooting and service, contact an authorized distributor or dealer.
Figure 2-5 Events Related to Paralleling
Generator Set State Description
Generator Management Off This generator has been stopped by generator management because it is not
presently needed to supply the load. The generator is available and will start if it is
needed again.
ProtectiveRelayTrippedContactor The contactor has been forced to open to protect one of the generators or the
customer’s load.
Synchronizing The generator is actively trying to match frequency, voltage and phase with that of the
paralleling bus.
Unloading The generator is actively trying to transfer load from itself to the other generator.
Figure 2-6 Generator Set States Related to Paralleling