Hamilton Sundstrand Company Gas Fuel Metering Valve HFG2.0 User Manual

 

 

 

The FAULT and OVERTEMP alarms are discrete outputs from the 
HFG2.0. The FAULT and OVERTEMP alarm circuits are closed in the 
normal operating condition. If the HFG2.0 detects a fault, the alarm circuit 
for that fault opens, and the user-provided controller should detect the 
open circuit. The fault is recorded in the fault file. 

The HFG2.0 firmware captures the fault data in the EEPROM. If the 
HFG2.0 is operational, a fault file can be downloaded using ActWiz 
software via the RS232 interface. The fault file will provide fault 
information and possible causes. The HFG2.0 must be in the Power Up / 
Set Up state to download the fault file. See Section 3.8 for details about 
the Power Up / Set Up state. Contact Precision Engine Controls 
Corporation to request ActWiz software. 

Should a fault occur, the user should shut down to troubleshoot the 
failure. Removing 120 VDC power shuts down the HFG2.0. Toggling the 
RESET command will clear the fault, but it does NOT clear the fault file. 

 

Note: The fault file only records the programmable faults that have 

been enabled

. 

 

The following are brief description of some of the faults that can be 
detected by the HFG2.0. See Section 3.7 and Table 3-1 

 , Table 3-2 

 , Table 3-3 

, and Table 3-4 

 for additional details 

about system faults. 

The maximum MCE current output limit is 25 amps. If the MCE is 
outputting its maximum current for ten (10) seconds, the MCE signals a 
fault. 

If MCE maximum current drop below the maximum current, the fault 
signal is cleared. 

The HFG2.0 position should continuously track demand. Should the 
position versus demand vary more than one motor revolution (0.20 
inches) for more than ten (10) seconds, the MCE signals a fault. 

If the position returns to within one motor revolution, the fault signal is 
cleared. 

 

CH. 4: TROUBLESHOOTING THE HFG2.0