High Country Tek HFS-3 - Manual (Page 7)

Hydraulic Fan System Controller – HFS-3-12v
7
• Plug driver unit onto valve coil to be driven.
• Remove ‘HFS-3-12v’ securing screw
• Remove ‘HFS-3-12v’ opaque lid to reveal internal adjustments.
• Ensure command PWM signal is set to zero.
• Ensure that all wire connections are correct and secure.
• Turn I Min potentiometer 1 turn Anti-Clockwise ( Minimum ).
• Turn I Max potentiometer 20 turns Clockwise ( Maximum ).
• Apply 12VDC ( +10 to +14VDC absolute Maximum ) to the driver plug.
INVERTED operation means that the output current is inverse to the input command signal.
i.e. 10% PWM = Max O/P
90% PWM = Min O/P
This option is intended for use with a reverse acting proportional control valve.
In this configuration, if the power supply fails, the fan unit will default to the FULL ON speed.
This option is the default for the plug top controller and link ‘A’ MUST be intact and not
removed. the location of
link ‘A’ is shown in the picture at the bottom of this page.
CAUTION:-
Link ‘A’, once removed, CANNOT be replaced.
• Slowly increase command to approx 90% of maximum PWM.
• Use the I Min adjustment to give minimum motor speed required.
• Slowly Increase command signal to 10% of maximum setting.
• Adjust I Max until desired motor maximum speed is achieved.
• Check that ‘Output ON’ led is functioning proportionally by varying the command signal.
• Ensure link is intact and NOT removed.
Adjustment Guide: INVERTED valve control operation
( Default setting )
.
Link ‘A”