HAD Product Manual
________________________________________________________________________________
High Country Tek, Inc.
208 Gold Flat Court
Nevada City, CA, 95959.
Tel: (1) 530 265-3236
www.hctcontrols.com 021-00141 Rev B2.1
6/8
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. To
check the card at full off, disconnect the VOLT and REF terminals and turn the MAX pot 10 turns CW and the MIN pot
10 turns CCW. The +COIL to -COIL voltage should be zero.
If the valve won't fully shift:
If the card passes the "full on test" above, the problem is in the system. Measure the power supply voltage at the power
supply or battery and the voltage across the coil's terminals. Compare these readings to the values taken at the card. If
there is excessive voltage drop in any of those wires, they should be shortened or replaced with smaller gauge wires
(larger conductor). Bad frame ground connections can cause large voltage drops.
When the coil heats up in use, it increases its resistance. Most coils will be able to draw sufficient current to fully shift
the valve if their rated voltage is supplied to the card and the card causes less than one volt drop. When this is not the
case, you must use a coil rated for less voltage or increase the power supply voltage. By using current regulation, the
card will have no trouble safely driving a 12 V coil from a 24 V supply, or a 10 V coil from a 12 V supply for example.
You will need a different card if the new coil draws more current than the card is rated for.
If the valve shift is erratic:
See the set up procedure section for Dither or visit our website for more help with troubleshooting including an
explanation of hysteresis and stiction.
Figure, 2
3.25
3.10
3.82
3.77
HAD******
D0000x
www.highcountrytek.com
CROSS OVER
MIN A
MIN B
B LIGHT
MAX
RAMP UP A
RAMP DOWN A
RAMP DOWN B
RAMP UP B
DITHER AMP
1.89
Mounting Holes, 0.186in
(4 pages)
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