HAD Product Manual Instruction, Installation and Operation Guide for: HAD Series Controllers Document Number: 021-00141 Document Revision: B2.1 Document Issue Date: Document Creator: J. Clark Document Creation Date: 9/10/2009 ________________________________________________________________________________ High Country Tek, Inc. 208 Gold Flat Court Nevada City, CA, 95959. Tel: (1) 530 265-3236 www.hctcontrols.com 021-00141 Rev B2.
HAD Product Manual Description The HAD, provides precise control of a dual coil proportional valve. The HAD will accept a control input of –5V to +5V, 0V to +5V, 0V to +10V or 4 to 20 mA from an external source or a potentiometer driven by the onboard reference output. It will accept power supply voltages from 11 to 30 volts DC and is able to drive coils with requirements from 31mA to 5.0 A. Options include ramping, dither, waterproof potentiometers and WeatherPak connectors.
HAD Product Manual Alignment Turn on the power supply. Crossover Point (Center Pot) Min B Coil (< Center Pot) Crossover Adjustment Drive Coil B Drive Coil A 100% Min A Coil (> Center Pot) Coil Current Drive Coil B Drive Coil A MAX A Coil (Max Pot) MAX B Coil (Min Pot) 0% Min Max Control Input Figure, 1 CROSSOVER is the point at which the valve driver output changes between A and B coils. Only one coil will be active at a time.
HAD Product Manual Do not adjust the unit to supply more current than is required to fully shift the valve; additional current may exceed the coil's rating, will reduce the useful range of the control input and may damage the valves coil. 6. Adjust the control input to fully shift the B coil and check system response. If the coil has not fully shifted, adjust the MAX pot as necessary. 7. The MIN, MAX, and CROSSOVER pots interact and the hydraulic system response may change as it warms up.
HAD Product Manual resolution. PWM control of inductive devices causes voltage spikes on the power supply or battery positive wires. These voltage spikes are a product of Flyback Current which is result of the decaying magnetic field of an inductor (valve coil) when voltage is removed during the PWM switching. These spikes of voltage can generate electromagnetic noise that may affect the operation of other components or sensors within the system.
HAD Product Manual Check the card at full on and full off: Do not try the full on test if the power supply is 50% higher than the coil's rated voltage. Temporarily disconnect all wires from the VOLT and CUR inputs. To test the card at full on, turn the MAX and MIN pots 10 turns CW and temporarily short the VOLT and REF terminals together. Measure the voltage from +COIL to -COIL and from +POWER to PWR COM. The voltage difference should be no more than one volt if the card is operating correctly.
HAD Product Manual FUSE REF + 1 1 + POWER Battery VOLT HAD 2 Pot CUR 2 + COIL A HAD SIG COM 3 PWR COM + 1 A COIL 2 + COIL B HAD Battery +PWR - COIL A Voltage Sensor - COIL B B COIL REF Output VOLT GND CUR HAD SIG COM + 1 + COIL A REF +PWR + COIL B HAD 2 A COIL + 1 2 - COIL A 4 - 20 mA Sensor GND Battery - COIL B Output Battery VOLT CUR HAD SIG COM B COIL Figure, 3 ________________________________________________________________________________ High Coun
HAD Product Manual HAD Part Number Index ANALOGPROPORTIONAL VALVE DRIVER SERIES RAM P: Selectthenumberoframp controls.Therampspot/sarepreset to0seconds;noadjustmentsare requirediframpsarenotdesired. H A D CURRENT S=Singleramppotforallramps. C=Individualramppotpercoil. T=Individualramppotperdirection. R=Individualramppotper directionofcoilmovement. RAM P DITHER DITHERFREQUENCY(050,100,130ETC.) DITHER: Selectthefrequencyto ditherthevalve.xxxiffrequencyin Hertz.
