Description, Wiring, Fusing – High Country Tek HAD Series User Manual
Page 2: Set up procedure, Initial setup, Had product manual, Indicator
HAD Product Manual
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High Country Tek, Inc.
208 Gold Flat Court
Nevada City, CA, 95959.
Tel: (1) 530 265-3236
021-00141 Rev B2.1
2/8
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.
Indicator
B Light – Lights when the “B” coil is selected because the command input is in the “B” coil range.
Wiring
Connect the unit as shown in Figure 3, using only one of the three command input configurations. Use 16 AWG wire
for power and coil wiring. Use shrouded coil connectors. Locate the fuse as close to the power supply as possible to
protect the wiring and the valve controller.
Fusing
Use an AGC-5 fuse for systems up to 3.3 amps and an AGC-10 for systems from 3.4 to 5.0 amps. Place fuse as close to
the battery as possible.
Failure to properly fuse the unit invalidates the warranty.
Set up procedure:
Compare the part number on your unit to the Part Number Index in Figure 4, for an explanation of options specific to
your unit.
This controller is best adjusted by observing system response. Coil current can be used, but coil voltage is not accurate.
Coil current may be measured by installing a 0.1 or 1.0 ohm resistor in series with the coil and measuring the voltage
drop across the resistor using a volt meter. Current may be calculated by I=E
RES
/R or current equals the voltage across
the resistor divided by the resistance in ohms.
INITIAL SETUP
1. Turn the MAX pot 10 turns CCW then 5 turns CW (set to center of pot)
2. Turn the MINA & MINB pots 10 turns CCW (off)
3. Turn all RAMP pots 10 turns CCW (off)
4. Turn the DITHER AMP pot 10 turns CCW (off)