MK Products Cobramatic 42VAC - Manual (Page 15)

Cobramatic ® Owner’s Manual - page 9
while welding. If there is a loss of water pressure, the switch will keep the
arc from igniting so no welding takes place without water cooling the torch.
The benefit of the water pressure switch far exceeds the minimal cost of its
purchase and installation.
This kit, when installed into the wire feeder, is physically adaptable to all
makes and models of water recirculators using standard fittings (left-hand
threaded).
Section D Maintenance
Routine Maintenance
Maintenance of the torch will normally consist of a general cleaning of
the wire guide system, including tubes, drive rolls, and conduits at regular
intervals.
Remove spatter build-up from inside of nozzles with a hardwood stick.
The only parts on the Cobramatic® system that are subject to normal wear
are the conduit, contact tips, gas cups, front body liners, wire guides, drive
and idler rolls. A supply of these parts should be maintained on hand.
If repairs do become necessary, any part can easily be replaced by qualified
maintenance personnel.
Your Cobramatic® is designed to provide years of reliable service. Normal
wear and component failure may require occasional service.
The number of units in operation and the importance of minimal “down time”
will determine to what extent spare parts should be stocked on hand.
Testing the Feeder
Relay K2 Operation
When the torch trigger is pressed, 24VAC is sent to the coil of relay K2.
When K2 is energized, AC is sent to the slave motor, spool brake, and the
AC contactor. Relay K2 is also responsible for sending 24VAC to the speed
control circuit and shorting the torch motor leads together when the trigger
is released for the dynamic braking system. K2 also provides the closing
contactor signal.
Testing the Input Power Circuits
The AC circuits are protected by fuse F3. If F3 continually blows, disconnect
J4 (Brake Solenoid), J7 (Slave Motor) and J5-3 & 4 - if connected (AC
Contactor Out.) from the PC board. Replace fuse and re-trigger system. If
fuse does not blow, isolate problem by reconnecting J4, J7 and J5-3 & 4 one
at a time until the fuse blows.
Section D
(Continued)