Hamilton Sundstrand Company Gas Fuel Metering Valve HFG2.0 - Manual (Page 55)

Fault Type Persist Time Fault Action
Motor 10 Sec
1 Sec
Motor temp > 130° C, Fault. . If fault exists and
Motor temp > 135° C for 10 Sec, shutdown.
Motor temp > 130° C, Fault
. If fault exists and Motor
temp > 130° C for 60 Sec, shutdown.
Electronics 10 Sec
1 Sec
Electronics temp > 110° C, Fault.
If fault exists and Electronics temp > 115° C for 10 Sec,
shutdown.
Electronics temp > 110° C, Fault.
If fault exists and Electronics temp > 100° C for 15 Sec,
shutdown.
Table 3-4. Fault Configuration For OVERTEMP Alarm
Automatic Shutdown Feature
The HFG2.0 has a self-protective shutdown feature. The HFG2.0 will
shutdown if:
• Any two motor winding temperatures exceed 135 °C for ten (10)
seconds or more (130 °C for 60 seconds )
• The electronics temperature exceeds 115 °C for 10 seconds or
more (100 °C for 15 seconds )
Note: The POSITION and MOTOR CURRENT feedback signals
will both be set to 0 mA when the current to the actuator
motor is removed.
WARNING
Property Damage and Injury Hazard – If the motor windings exceed
135
° C (130 °C ) or the electronics exceed 115° C
(100 ° C ), the MCE will shut down power to the motor and
electronics thereby allowing the actuator to move with load. When
power is removed, the return spring causes the poppets to return to
the soft seats, thereby closing the valve. Touching the HFG2.0 may
result in serious burn injury
CH. 3: OPERATING THE HFG2.0 49