High Country Tek HFS-3 - Manual (Page 13)

Hydraulic Fan System Controller – HFS-3-12v
13
Wire Color Function
RED 12VDC (10 to14VDC) Supply I/P
BLUE 0V (GND) Supply I/P
GREEN PWM+ Signal I/P from ECU
YELLOW PWM 0V (GND) I/P from ECU
Block Diagram:
Wiring Information:
PWM
F.E.T.
output
stage
I Max ( 20 Turn potentiometer )
‘Dither’ ( PWM )
frequency adjust
I Min adjust
+V Supply
GND (0v)
PWM +
from ECU
Internal
PSU
Current
Feedback
PWM ‘ f ’
generator
Output to
valve coil
interface
PWM
–
from ECU
PWM to
Voltage
Ramp
Generator
Output invert link