Hamilton Sundstrand Company Gas Fuel Metering Valve HFG2.0 Manual Do Utilizador
16 HFG2.0
USER
GUIDE
Note: A battery system is recommended for highest reliability.
Note: If a 120 VDC power supply is used rather than a battery,
ensure an output capacitance of at least 12,000 µF, which
can both sink and source electric current. See Power
Supply Requirements (Table 1-2).
can both sink and source electric current. See Power
Supply Requirements (Table 1-2).
Note: Use a separate conduit for the power wiring. This prevents
noise pickup and transmission from ancillary equipment,
which could cause instability in the actuator.
which could cause instability in the actuator.
Power Supply Requirements
Table 1-2 below lists the power supply requirements for the HFG2.0.
PARAMETER
VALUE
Voltage
Nominal
Range
Range
120 VDC
80 – 160 VDC
Max. Ripple
4 VAC RMS or 12 VAC p-p
Current
Maximum
Continuous , Typical
Transient,
Typical
20 Amps
<1 Amp
+20 A <60 ms
+10 A <600 ms
-5 A <100 ms
*Output Capacitance
12,000 µF (typical)
Table 1-2. Power Supply Requirements
*The output capacitance applies for non-battery power systems and assumes full-stroke step
changes in actuator position at rated load. This value is typical. The actual value required is
dependent on the user’s specific DC power system design, including:
changes in actuator position at rated load. This value is typical. The actual value required is
dependent on the user’s specific DC power system design, including:
•
Power sources used in the DC power system (their output impedance, transient response,
rating, diode decoupling [if any], topology, etc.)
rating, diode decoupling [if any], topology, etc.)
•
All electrical loads and components connected to each respective power bus branch
•
Switching relationships of these electrical loads and components to each other (for example,
does a large motor and actuator turn off at about the same time, etc.)
does a large motor and actuator turn off at about the same time, etc.)
•
Bus branch conductor length and arrangement (flat bus bars, round cables, twisted, etc.)