Hamilton Sundstrand Company Gas Fuel Metering Valve HFG2.0 - Manual (Page 61)

5 TROUBLESHOOTING
This section provides troubleshooting information for the HFG2.0. You
can isolate most electrical faults by using an external oscilloscope and
digital voltmeter (DVM) and computer with diagnostic software.
The HFG2.0 is comprised of highly reliable components and should not
develop service problems under normal operating conditions. However,
over a period of time and service, failures may develop. Whoever is
responsible for fault analysis should be thoroughly acquainted with
physical and electrical configurations, Theory of Operation (Section 2),
and Installation (Section 1).
Resolve problems noted during operation or maintenance as soon as
possible. The causes of many problems can be traced through the
information contained in the block diagram shown in Section 2.
CAUTION
Continuing to operate the valve in a malfunctioning condition is
hazardous to personnel and can cause property damage.
Tables 5-1 and 5-2 list common failures that can occur before or after
valve installation, respectively.
In addition, the HFG2.0 has on-board troubleshooting capability. The
ActWiz software has a fault file that you can upload to pinpoint a failure
cause. See the ActWiz Software Manual for more details.
If, after following the troubleshooting procedures, you still can’t find the
cause of the problem and repair it, contact the factory for assistance.
CH. 4: TROUBLESHOOTING THE HFG2.0 55