MK Products Cobramatic II - Manual (Page 16)

Cobramatic ® II Owner's Manual - Page 9
applications, it is important when using a meter kit on the Cobramatic ® II
cabinet to make sure the demand and actual wire speeds are the same.
It is equally important to maintain proper calibration when using a remote
(0-10VDC) input to control wire speed, as this will expect certain results for
each demand of input voltage.
The goal of this calibration procedure is to have 1 volt of input to equal 100
ipm at the torch, 2 volts equals 200 ipm, etc.
1. Insure that switch 2 (S2) is in the correct position for the torch you
are using.
2. Insure that switch 1 (S1) is in the correct position for your control
requirements (torch pot, cabinet pot or remote).
3. Set the pre-purge control to off, if so equipped. Turn Posa Start off.
4. Adjust the command voltage (TP11) to 2.00 VDC using the torch pot,
cabinet pot or remote command depending on the position of (S1).
Use J22-1 for ground reference.
5. Feed out wire for exactly six (6) seconds and measure. You should
have 20 inches of wire for a 2 volt command. Repeat and compare
the two segments of wire for an average length.
6. If wire length is less than 20 inches (200 IPM), increase (clock wise)
R54 and repeat step 5. If wire length is is greater than 20 inches
(200 IPM), decrease (counter-clock wise) R54 and repeat step 5.
R54 adjustment is approximately 0.5 inches/turn (5 IPM/turn).
7. Adjust the command voltage (TP11) to 6.00 VDC using the torch pot,
cabinet pot or remote command depending on the position of (S1),
8. Feed out wire exactly exactly six (6) seconds and measure. You
should have 60 inches of wire for a 6 volt command. Repeat and
compare the two segments of wire for an average length.
9. If wire length is less than 60 inches (600 IPM), increase (clockwise)
R69 and repeat step 5. If wire length is greater than 60 inches
(600 IPM), decrease (counter-clockwise) R69 and repeat step 8. R69
adjustment is approximately 1.0 inch/turn (10 IPM/turn).
10. Repeat steps 4 through 9 until the wire speed (IPM) matches the
demand voltage (VDC).
S
ECTION
C A
CCESSORIES
Plastic Guides for Slave Motor
Inlet Guide . . . . . . . . . . . . . . . . . . . . 753-0062
Outlet Guide with Knob . . . . . . . . . . 003-0428
O
PTIONAL
K
ITS
Cabinet Potentiometer Kit . . . . . . . . 005-0166
Removes wire feed speed control from the torch to the cabinet and provides a 10-turn
counter dial.
Timer Kit . . . . . . . . . . . . . . . . . . . . . . 005-0196
Provides pre-purge, post-purge, Burn-back and spot-time
Meter Kit . . . . . . . . . . . . . . . . . . . . . . 005-0190
Displays both wire feed speed and weld voltage
Preset Adjusting Screw Kit . . . . . . . . 005-0125*
Water Flow Kit . . . . . . . . . . . . . . . . . 005-0253
Wire Guard Kit . . . . . . . . . . . . . . . . . 005-0618*
*standard on all wire feeders