High Country Tek HFS-2Q - Manual (Page 11)

Hydraulic Fan System Controller : HFS - 2
Fan ‘Noise Test’ Feature :
1) Turn controller power supply OFF.
The controller allows the user to set a pre-determined value of output current to the proportional valve that
will equate to the required 70% forward fan speed required for the noise inspection.
Once set to the desired level, this value is saved to the controller then allows the user to quickly demonstrate
the noise level of a forward driven fan by following the sequence below:-
2) Depress and hold the ‘Manual purge’ sequence button.
3) Apply power to the controller.
4) Continue to hold the ‘manual purge’ button down for approx. 5 seconds after power application then
release to enter the ‘ Test mode ‘.
5) This ‘ Test mode ‘ will drive the fan in the forward direction for 3 minutes ( this time is fixed ).
6) When the time period has expired, the fan will return to normal system operation and cannot be put
back into test mode unless points 1) thro 4) are re-applied.
Important Notes:-
• This is an OPEN LOOP test feature which even after accurate factory setting, can be marginally effected by external
conditions such as ambient and oil temperature, oil viscosity and system condition.
• The sequence can be stopped / reset at any time during the 3 minute test period by removing the power supply.
• The ‘Test mode’ period is pre-set to 3 minutes by the manufacturer and is not changeable by the user.
• The set-up software allows the user to pre-set the fan forward speed that is used during this ‘ Test mode ‘.
For most accurate smooth control with best resolution, protection and product reliability, the following
combinations of power supply and valve coil voltage should be adhered to:-
Proportional coils ( fan speed control NO PURGE OPTION FITTED ):-
Power Supply and Coil Voltage :
Proportional coils ( fan speed control…. NO PURGE OPTION FITTED ):-
8 – 14VDC:- Use 12V valve coil.
20 – 36VDC:- Use 24V valve coil.
Directional coil ( Fan direction control.. NEEDED FOR PURGE OPTION ) :-
8 – 14VDC:- Use 12V valve coil
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8 – 14VDC:- Use 12V valve coil.
20 – 36VDC:- Use 24V valve coil.