High Country Tek HFS-3 - Manual (Page 10)

Hydraulic Fan System Controller – HFS-3-12v
10
• 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.
NON-INVERTED operation means that the output current follows the input command signal.
i.e. 10% PWM = Min O/P
90% PWM = Max O/P
This option is intended for use with a proportional flow control or variable pump electro-hydraulic stroker.
In this configuration, if the power supply fails, the fan unit will default to the OFF speed.
For this option to be activated, the user must remove ( by cutting ) link ‘A’, the location of which
is shown 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 ‘A’, is cut and REMOVED
Adjustment Guide: NON-INVERTED valve control operation.
Link ‘A”