High Country Tek HFS-3 - Manual (Page 14)

Hydraulic Fan System Controller – HFS-3-12v
14
NOTE:- The ‘Emergency Fan STOP’ configuration shown above assumes that the controller is
being used in Inverted mode i.e. :
10% PWM = fan full on, 90%PWM = fan full off.
Closing the relay will force the input to 12V supply voltage and the fan will be controlled to fully
OFF and will remain in this state until the relay is released.
If the NON-Inverted mode is selected, the relay should be connected to 0V to achieve fan OFF
when relay energized.
0VDC
BLUE
GREEN YELLOW
RED
Rubber
gasket
+12VDC ( +10 to +14V max )
Engine Control
Unit ( ECU )
+ PWM
output
PWM 0V
output
Proportional Valve Coil
0VDC
BLUE
YELLOW
RED
Rubber
gasket
+12VDC ( +10 to +14V max )
+ PWM
output
PWM 0V
output
Proportional Valve Coil
GREEN
Engine Control
Unit ( ECU )
Emergency Fan
STOP relay
configuration.
NC
NO
Connection Options: