Hamilton Sundstrand Company Gas Fuel Metering Valve HFG2.0 - Manual (Page 26)

20 HFG2.0 USER GUIDE
Analog Inputs
The analog input, DEMAND, has a current range of 4 - 20 mA. It is
electrically isolated up to 500 VAC from the enclosure, 120 VDC power,
digital I/O, and serial interface. The analog interfaces are not isolated from
each other. See Figure 1-13 for a typical analog input connection.
HFG2.0 4-20mA INPUT CONTROLLER 4-20 mA OUTPUT
+
-
DEMAND [BRN]
DEMAND RT N [WHT/BRN]
200
Ω +
-
Figure 1-13. Typical Analog Input Connection
Analog Outputs
The analog outputs, MOTOR CURRENT and POSITION, have a current
range of 4 - 20 mA. They are electrically isolated up to 500 VAC from the
enclosure, 120 VDC power, digital I/O, and serial interface. The analog
interfaces are not isolated from each other. See Figure 1-14 for a typical
analog output connection.
CONTROL LER 4-20mA INPUT HFG2.0 4-20mA OUTPUT
+
-
POSIT ION [YEL]
MT R CURRENT [BLU]
POSIT ION RT N [W HT /YEL]
MT R CURRENT RT N [W HT /BLU]
<500
Ω
+
-
Figure 1-14. Typical Analog Output Connection
Discrete Inputs
The discrete inputs are 24 VDC ON (High) and 0 VDC OFF (Low). They
are electrically isolated up to 500 VAC. See Figure 1-15 for a typical
discrete input connection.
CONTROLLER DISCR ETE OUT PUT
HFG2.0 DISCRET E INPUT
RUN RTN [WHT/VIO]
RESET RTN [WHTGRY]
RUN [VIO]
RESET [GRY]
Figure 1-15. Typical Discrete Input Command Connection