Hamilton Sundstrand Company Gas Fuel Metering Valve HFG2.0 Manual De Usuario

 

 

The firmware program continuously monitors system health while the 
HFG2.0 is powered. If any of the health parameters are out of the normal 
operating range, the MCE outputs a discrete fault alarm to the user’s 
controller.  

Some fault causes are: 

• MCE 

over-current 

• Tracking 

error 

• RDC 

failure 

•  Input voltage out of range 

 

The HFG2.0 features two discrete, non-latching outputs that are 
configured as fault alarms. Upon power-up, the fault circuits close and 
stay closed in the normal operating condition. When the HFG2.0 detects 
a system fault, it opens the fault circuit designated for that particular fault. 

If a fault alarm is detected, the user should shut down the HFG2.0 to 
investigate the failure cause. Removing 120 VDC power shuts down the 
HFG2.0 valve. 

Toggling the RESET command will clear the alarms. 

 

The configuration of faults assigned to the FAULT alarm is programmable 
in the most recent generation

 of the HFG2.0 (factory-configurable 

only). See Table 3-1 for the default configuration

 of faults assigned to 

the FAULT alarm.  

See Table 3-3 for a list of fault conditions represented by the FAULT 
alarm in earlier generations

 of the HFG2.0.  

The configuration of faults assigned to the OVERTEMP alarm is 
programmable in the most recent generation

 of the HFG2.0 (factory-

configurable only). In the default configuration, the Motor Over Temp fault 
is the only fault assigned to the OVERTEMP alarm. If the HFG2.0 detects 
that the temperature in two or more of the motor windings is 135° C or 
higher, the OVERTEMP alarm circuit opens. See Table 3-2 for details 
about the default configuration 

 of the OVERTEMP alarm. 

 

CH. 3: OPERATING THE HFG2.0