TP-6735 7/17 49Section 4 Controller
Code See SectionCheckConditionWorSD*Fault
UF Underfrequency SD [ Governed frequency falls below
90% of the system frequency
setting for more than
5 seconds, or 1 Hz below the
system frequency setting for
more than 60 seconds.
Function becomes active 10
seconds after engine start.
(10 second inhibit).
Reduce the load and restart the
generator set.
—
Check controller setting for
system frequency.
I/M
Check the engine governor
settings, and adjust if necessary.
(Parameter 4P, governor speed)
5.9.5
US Underspeed SD [ Engine speed drops below 85%
of the normal running speed for
more than 0.3 seconds.
Reduce the load. —
Check for throttle linkage
obstruction.
5.9.2
Check for a loose or disconnected
governor stepper motor harness.
Check for bad leads in the
harness.
5.9.2
Check the stepper motor
operation.
5.9.2
5.9.4
UU Under voltage SD [ Output voltage falls below 80%
of the nominal system voltage
for more than 10 seconds.
Reduce the load and restart the
generator set.
—
Check wiring and connections.
7
Check controller configuration,
system voltage and frequency
(parameter Uu).
4.10
Check AC voltage and adjust, if
necessary (parameter 1P, voltage
adjust).
5.7
Check the calibration (SiteTech
software required). Controller
firmware version 2.04 or higher is
required for calibration.
4.11
Separately excite unit.
5.2
Check stator continuity.
5.3
* W = Warning; SD = Shutdown
[ Engine cooldown runs before shutting down.
Engine S/M = Engine Service Manual
I/M = Generator Set Installation Manual
O/M = Generator Set Operation Manual
Figure 4-8 Controller Fault Codes
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