52 Section 4 Troubleshooting TP-6844 1/13
4.6 Fuel System Troubleshooting
Most problems with gas fuels involve either fuel
pressure or fuel regulator function. Basic
troubleshooting consists of verifying fuel pressures
and checking each fuel system component.
Check the following items:
• Check primary fuel regulator outlet pressure. This is
the line pressure.
• Check the primary regulator vent for obstructions
and clean, if necessary.
• Check fuel shutoff inlet pressure.
• Check secondary fuel regulator inlet pressure.
• Check fuel inlet pressure at the gas mixer.
• Perform fuel system maintenance if necessary. See
Section 2.10, Fuel System Maintenance.
4.7 Fault Messages
The VSC controller displays fault messages to aid in
troubleshooting. Fault messages, descriptions, and
recommended checks are listed in Figure 4-2.
Fault messages will also appear in the Event History in
SiteTech. The wording of the message in the Event
History may vary slightly from the message shown on
the controller display.
Identify and correct the cause of the fault condition.
Refer to the troubleshooting charts in Section 4.9 for
additional recommendations. Then press the OFF
button to reset the controller after a fault shutdown.
Figure 4-2
Fault Message Action Description/Comments Check
AC Sens Loss Shutdwn
(Loss of AC sensing shutdown)
Shutdown The controller shut down the generator
because there was less than 5% of rated
voltage measured on Phase A for
3 seconds, only in AUTO, only after
acceptable voltage (> 5% of UV setting)
has been detected.
Check for loose wiring and
connections.
Check all AC leads.
Troubleshoot alternator.
AC Sens Loss Warning
(Loss of AC sensing warning)
Warning The controller has measured less than
5% of rated voltage on Phase A for
1 second, 10 seconds after crank
disconnect.
Check for loose wiring and
connections.
Check all AC leads.
Troubleshoot alternator.
AccyPwrOver Warning Warning Accessory Power Overload. An
overcurrent fault (short circuit) on the
accessory power output.
Check wiring to accessories.
Check PWR and COM
connections.
Troubleshoot the accessories.
Refer to the documentation
provided with the accessories.
Aux Input Shutdwn *
(Auxiliary input shutdown)
Shutdown The controller shut down the generator
because the digital input for a custom
shutdown (AuxiliaryInputShutdown - PIM)
was activated (low).
Check customer equipment
connected to the PIM module
Aux Input Warning *
(Auxiliary input warning)
Warning The digital input for a custom warning
(AuxiliaryInputWarning - PIM) is active
(low).
Check customer equipment
connected to the PIM module
Batt Chg Flt Warning *
(Battery charger fault warning)
Warning The digital input for Battery Charger Fault
Warning (PIM) is active (low). For an
external battery charger only, not
applicable to the VSC built-in battery
charging.
Check customer equipment
connected to the PIM module.
Battery High Warning Warning The controller has measured battery
voltage that is above the high warning
setting for 10 seconds or more.
Operates during exercise and normal
operation.
Check engine starting battery.
Battery CRLow Warning † Warning Battery voltage dropped to 11 VDC or less
for 30 seconds or more.
Check engine starting battery.
Check battery charger DC
output voltage from VSC on lead
CHO to the battery.
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