MK Products Advanced Color Logic Rev.C - Manual (Page 43)

Advanced Color Logic Owner’s Manual - Page 38
Required Test Equipment
• 4 1/2 Digit DMM, with varied leads.
• 20VDC adjustable power supply, with varied leads.
• Calibration Kit (P/N 005-0251)
Calibration Kit
In order for the calibration procedure to be successfully performed, the
Calibration Kit must first be connected and adjusted. The Calibration Kit
consists of a general purpose air-cooled handheld TIG torch rated at 150
amps, a calibrated current shunt (50mV/200A) in a fixture with standard dual
female banana plug connectors and leads, all of which are mounted within an
adjustable fixture for calibration purposes.
Adjustment of the Calibration Kit requires the use of standard feeler gauges
and an adjustable end wrench. Turn the copper block counter-clockwise so
that it is approximately 1/4” from the bottom of the torch cup (nozzle), spin the
hex-nut up to and against the bottom of the block. Holding the nut with the
wrench, turn the copper block clock-wise and down against the nut, thus in
effect “jamming” the block and nut against each other.
NOTE
Positive and tight surface contact between the copper block
and the “jam” nut on the stud is absolutely essential
in order to maintain a consistent and stable arc.
Once the block is secured against the nut, remove the black cap from the top
of the torch. Place a feeler gauge (0.035” - 0.045”) under the cup and drop
the tungsten down through the collet in the torch (collet and collet body for
holding 3/32” diameter tungsten are standard), so that it stops on the feeler
gauge. Replace the cap onto the torch and tighten to hold the tungsten
from moving.
If adjusted properly, this will assure a consistent tungsten-arc-gap for
performing the Current Calibration portion of this procedure.
Arc Voltage Calibration
The weldhead control connector on the weldhead cable should be plugged
into the ACL. Be certain the there is no obstruction in the weldhead - the
rotor must turn for this test to work.
Connect the DC power supply to the ARC VOLTAGE side of the shunt
box, positive-to-positive, and negative-to-negative. Then connect the DMM
either at the power supply or across the power supply leads at the shunt
box, and set the DMM to read up to 20 VDC.
If the leads in this operation are reversed, the arrows on the Voltage
bar graph will point in the reverse direction and the power supply may
“fold back” on itself.
This will cause the voltage from the power supply to drop and the current
will peak to maximum. When this occurs, turn the power supply and the
ACL off, check polarity connection from the power supply to the shunt
box, and restart this calibration.
A negative reading on the DMM means the leads between the DMM
and the shunt box or power supply are reversed. To correct this simply
reverse the reading leads either at the DMM or at the shunt box.
Once connected, with the ACL in TEST Mode, press [START/STOP] on
the HHC. The ANA_CAL procedure will enter Level 1 and the rotor will
start rotating.
Input each of the Voltage levels that are listed on the attached calibration
data sheet. At each input voltage, if needed, adjust the displayed
Section D
(Cont.)