MK Products Cobramatic 42VAC - Manual (Page 12)

Cobramatic ® Owner’s Manual - page 6
Welding Torch Connections
Work Cable
Connect a work lead of sufficient size and length (see table below) between
the proper output stud on the power source and the work. Be sure the
connection to the work makes tight metal to metal electrical contact. Poor
work lead connections can result in poor arc initiation, poor weld results and
activation of the ground lead protector.
Work Lead Lengths
Current 60% Up to 50ft. 10-100ft.
Duty Cycle (15.2m) (15.2-30.4m)
300A 0 (53mm) 0 (67mm)
400A 00 (67mm) 00 (85mm)
500A 00 (67mm) 00 (85mm)
600A 000 (85mm) 000 (107mm)
Control Cable
The 7-Pin “W” Clocked connector screws onto the mating receptacle on the
front panel of the wire feeder. This provides all electrical signals (motor
voltage, potentiometer control & trigger) to and from the feeder to the torch.
Wire Conduit Inlet
Front panel access to attach conduit to front of slave motor assembly.
Power Cable Inlet
Front panel access to attach power cable (air or water) to top of power block.
Gas Inlet
Front panel access to attach gas hose to bottom fitting of power block.
Water Inlet (For Water Cooled Torches)
Front panel access to connect the water hose to the middle fitting on the
power block.
Section B Operation
General
The AC slave motor in the feeder runs at a fast, constant speed, but has very
low torque. It is always trying to feed more wire than the torch motor wants,
and when the motor gets all it wants, it slows the slave motor preventing a
bird’s nest. Because of the low torque produced by the slave motor, a brake
system is used to prevent wire overrun rather than tension. The spool drag
tension is produced by the patented Wire Retainer Bar mechanism to keep
the wire slightly taut. The 24 VDC torch pull motor is controlled by a solid
state speed control and a potentiometer located in the torch.
Recommended Processes and Equipment
The Cobramatic® is recommended for use in the GMAW and FCAW welding
applications. It is recommended for use with constant voltage power sources.
The Cobramatic® is capable of feeding wires (diameter capacity) ranging
from .023” through .045” solid/cored and .030” through 1/16” aluminum.
Controls and Settings
On/Off Switch
Placing the switch in the “ON” position energizes the feeder circuitry and the
power indicator light.
Wire Size Selector Switch
The wire size selector switch changes the torque of the slave motor for the
wire you are using. When in the .030-.035 aluminum only position, the slave
Section B
(Continued)