High Country Tek HAU Series - Manual (Page 4)

HAU Product Manual
High Country Tek, Inc.
208 Gold Flat Court
Nevada City, CA, 95959.
Tel:- (1) 530 265 3236
www.hctcontrols.com 021-00140_HAU_User_Guide_Rev_Bp2 4/10
RAMP Adjustments (Optional):
If the unit has one ramp potentiometer it will adjust the ramping function for both directions of control to
the same setting.
If the unit has two ramp potentiometers, RAMP UP will adjust the ramp time for current increases and
RAMP DOWN will adjust for decreases in current.
Ramp is adjusted by quickly switching the control input from minimum to maximum, or maximum to
minimum and adjusting the corresponding potentiometer to obtain the desired speed of response.
NOTE: CW adjustment of the potentiometers will increase the ramp time.
Dither Adjustments (Optional)
DITHER AMP:
The dither amplitude potentiometer is set fully CCW (off) at the factory.
Once the valve being driven is established, adjust the potentiometer CW increasing the dither amplitude
until the desired level is reached then readjust the MAX and MIN potentiometers.
DITHER FREQ:
The dither amplitude may be pre-defined at time of order and if not, the frequency will be factory set to
140Hz.
If the valve is changed or a different dither frequency is needed, adjust the potentiometer CW, increasing
the frequency until the desired level is reached.