MK Products Cobramatic 120VAC - Manual (Page 9)

Cobramatic ® Owner’s Manual - page 2
Shielding Gas
In accordance with the required support equipment, the customer must
provide a cylinder of shielding gas, a pressure regulator, a fl ow control valve,
and a hose from the fl ow control valve to the left bottom-most fi tting on the
power block.
The end of the hose must have a male connector to fi t the female 5/8-18
brass fi tting. Use a 11/16” wrench to tighten.
Coolant Supply and Return (if used)
Using a recirculator with properly mixed coolant, as previously described,
connect the coolant RETURN hose to the left middle fi tting on the power
block. Connect the coolant SUPPLY hose to the left top-most fi tting on the
power block.
The coolant hoses must have a male 5/8-18 left-hand thread to connect to the
power block fi ttings. Use an 11/16” wrench to tighten.
Welding Power
The electrode cable coming from the welding power supply should be affi xed
with a 1/2” copper ring lug. Using a 9/16” wrench, remove the 3/8” bolt and
washer from the bottom of the power block. Use a 9/16” wrench to tighten.
It is recommended to make this connection last, after connecting the gas and
coolant hoses. Reference Input Connections fi gure in the Appendix.
Wire Threading Procedure
Wire Spool Installation
Release latches, and open right side door of cabinet.
Remove spool retainer from spindle hub.
Raise wire retainer bar to latched position.
Install wire spool onto spindle hub so that wire feeds from bottom of spool
towards slave motor. Make sure that the hole in the spool aligns with pin
on spindle hub. The white dot on the end of the spindle hub will aid in
this alignment.
Replace the spool retainer nut.
Lower the wire retainer bar onto the spool.
Wire Spool Drag Setting
NOTE:
Standard factory setting of the Spindle Tension Knob is set for All Other Wires.
There are two visible position settings for this Knob, IN - All Other Wires
(Fig. 1) and, OUT - .030/.035 Al Only (Fig. 2). The Spindle Tension Knob
must be set to match the Wire Size Selector Switch on the Cobramatic®
front panel.
IN - All other wires
Figure 1
OUT - .030/.035 Aluminum ONLY
Figure 2