TP-6196 10/09
58
Section 5 ADC-RES and DC-RET Controller
Code Fault
Description
Check
Refer to
Section
AF
Auxiliary fault
Indicates a shutdown initiated by the emergency stop
switch or a tripped circuit breaker.
(TRES models only)
Check the position of the
emergency stop button.
(TRES models only)
O/M
HE
High engine
temperature
Shutdown occurs if the engine coolant temperature
exceeds the maximum temperature for more than
5 seconds. This protective becomes active after the
engine reaches the crank disconnect speed.
Check for blocked air inlets and
exhaust outlets.
1.7
LOP
Low oil
pressure
Shutdown occurs if a low oil pressure condition
exists for more than 5 seconds. This protective
becomes active 30 seconds after the engine has
reached crank disconnect speed (30 second inhibit).
Note:
The low oil pressure shutdown does not
protect against low oil level. Check the oil level at
the engine.
Check for leaks in the lubrication
system.
Check the oil level and add oil if
the level is low.
Check low oil pressure switch
connections and operation.
Check the oil pump and
lubrication system.
—
2.2
6.11
Engine
S/M
OC
Overcrank
Shutdown occurs after 3 unsuccessful starting
attempts. The crank cycle is set for three starting
attempts of 15 seconds cranking and 15 seconds
rest.
Check the fuel supply valves and
pressure.
Check spark plug and battery.
See Troubleshooting Chart,
generator set cranks but does not
start.
6.12
O/M
3.3
Locked rotor
The generator set shuts down on an overcrank fault
if no engine rotation is sensed. Shuts down 3
seconds after the fault is detected.
Check mag pickup connections
and operation.
Check for a locked rotor.
6.9.4
—
OF
Overfrequency
Shutdown occurs when the governed frequency
exceeds 110% of the system’s frequency setpoint for
more than 5 seconds. This protective becomes
active 10 seconds after engine start (10 second
inhibit).
Check system frequency setting
(parameter UU) on controller.
4.5
Measure output frequency and
adjust, if necessary.
6.9.5
Check governor system condition
and operation.
6.9
OS
Overspeed
Shutdown occurs if the engine speed exceeds 110%
of the normal running speed for more than
0.3 seconds.
Check governor settings and
operation.
6.9.5
6.9
OU * Overvoltage
Shutdown occurs if the voltage exceeds 120% of the
system nominal voltage for more than 2 seconds.
Check AC voltage.
Check wiring and connections.
6.7
8W/D
UF
Underfrequency Shutdown occurs when the governed frequency falls
below 54 Hz for more than 5 seconds. This
protective becomes active 10 seconds after engine
start. (10 second inhibit).
Reduce the load and restart the
generator set.
—
UU
Undervoltage
Shutdown occurs if the 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.
8W/D
Check controller configuration,
system voltage and frequency
(parameter UU).
4.5
Check AC voltage and adjust, if
necessary.
6.7
Check the SCR module. Replace
if necessary and test voltage
again.
6.8
Separately excite unit.
6.2
Check stator continuity.
6.3
SCF0 Software
Communication
Fault 0
Indicates a software or communication problem
within the ADC-RES.
Replace the controller.
4.9
Engine S/M = Engine Service Manual; O/M = Generator Set Operation Manual
* ADC-RES only
Figure 5-7
Fault Codes, Shutdowns
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