High Country Tek HFS-J-Bus - Manual (Page 20)

Electronic Controller Solutions for the Global Fluid Power Industry
Hydraulic Fan System Controller with SAE J1939 Interface
HFS-J User Guide
Part No:- 021-00158 Rev C HFS-J Hydraulic Fan System Controller User Guide Page | 20
Controller Set-up:
Selection Tab ->
Settings
• Max Valve Cur %:
This sets the maximum drive current to the valve coil and should always be above Min current
Input 0 to 100% ( 100% = 3Amps ).
• Minimum RPM:
This value is the engine RPM needed before the fan controller will start to operate above the minimum system
speed set by the motor pressure drop – this reduces the load on the starter motor.
NOTE: Information for this feature is taken from the J1939 Bus and cannot be used if not connected.
Input – 50 to 4000 RPM.
• Start Up Delay:
This is set in seconds and is only actioned when power is applied to the module i.e. at key ON engine start
time. This feature is designed to reduce the load on the starter motor by holding off fan operation until the time
set has expired.
Input 0 to 30 seconds
• Ramp UP & Down:
These are set in seconds and affect the rate of change of output current to the coil. These should be set to give
smooth operation but not too long or performance will be affected by slowing down fan speed response.
Input –
0 to 30 seconds ( It is reccomended that ±0.5 seconds be always set to give best output current regulation )
This page gives the user access to all of
the modules operational settings.
• Valve Mode:
Select Proportional OR ON/OFF valve
type. If ON/OFF is selected, the min and
max settings will still apply but there will
be NO proportionality or ramps between
the values
• Min Valve Cur %:
This sets the minimum drive current to
the valve coil and should be set to
reduce the valve dead-band and get
smooth, accurate operation.
Input -10% to 100% ( 100% = 3Amps ).
value.
Min Valve Current % IMPORTANT NOTE:
HCT has determined that some cooling system designs, typically using FORWARD ACTING VALVES may require some offset for zero
current. To offer this feature, the adjustment range in the I Minimum Valve Current % will allow the user to set a negative value to a maximum
of -10%.
If the user cannot achieve Minimum fan speed (with respect to normal hydraulic across-valve leakage) on a forward acting system or
Maximum fan speed on a reverse acting system, the user may adjust the “Min Valve Cur %” to below zero ( i.e. ‘-2’ to achieve the desired
result.
CAUTION: Adjusting the “Min Cur %” too far below 0 (zero) can induce deadband into the system that must be overcome before real change
is seen at the fan speed, and this may appear as the system being slow to react to changes from the ‘fan start temperature’ setting.