Overload Protection - Lincoln Electric POWER MIG 180 DUAL Operation Manual

D-2

OVERLOAD PROTECTION

Output Overload
The POWER MIG® 180 DUAL is equipped with a cir-
cuit breaker and a thermostat which protects the
machine from damage if maximum output is exceed-
ed. The circuit breaker button will extend out when
tripped. The circuit breaker must be manually reset.
Thermal Protection
The POWER MIG® 180 DUAL has a rated output duty
cycle as defined in the Technical Specification page. If
the duty cycle is exceeded, a thermal protector will
shut off the output until the machine cools to a reason-
able operating temperature. This is an automatic func-
tion of the POWER MIG® 180 DUAL and does not
require user intervention. The fan continues to run
during cooling.
Electronic Wire Drive Motor Protection
The POWER MIG® 180 DUAL has built-in protection for
wire drive motor overload.
CHANGING LINER
NOTICE: The variation in cable lengths prevents the
interchangeability of liners. Once a liner has been cut
for a particular gun, it should not be installed in anoth-
er gun unless it can meet the liner cutoff length
requirement. Refer to Figure D.2.
1. Remove the gas nozzle from the gun by unscrew-
ing counter-clockwise.
2. Remove the existing contact tip from the gun by
unscrewing counter-clockwise.
3. Remove the gas diffuser from the gun tube by
unscrewing counter-clockwise.
4. Lay the gun and cable out straight on a flat surface.
Loosen the set screw located in the brass connec-
tor at the wire feeder end of the cable. Pull the liner
out of the cable.
5. Insert a new untrimmed liner into the connector end
of the cable. Be sure the liner bushing is stenciled
appropriately for the wire size being used.
6. Fully seat the liner bushing into the connector.
Tighten the set screw on the brass cable connector.
At this time, the gas diffuser should not be installed
onto the end of the gun tube.
7. With the gas nozzle and diffuser removed from the
gun tube, be sure the cable is straight, and then
trim the liner to the length shown in the Figure D.2.
Remove any burrs from the end of the liner.
MAINTENANCE
Set Screw
Liner Assembly
(Liner bushing to be sealed tight
against brass cable connector)
8. Screw the gas diffuser onto the end of the gun tube
and securely tighten.
9. Replace the contact tip and nozzle.
GUN HANDLE PARTS
The gun handle consists of two halves that are held
together with a collar on each end. To open up the
handle, turn the collars approximately 60 degrees
counter-clockwise until the collar reaches a stop. Then
pull the collar off the gun handle. If the collars are diffi-
cult to turn, position the gun handle against a corner,
place a screwdriver against the tab on the collar and
give the screwdriver a sharp blow to turn the collar
past an internal locking rib. See Figure D.3.
FIGURE D.3
POWER MIG® 180 DUAL
Gas Diffuser
Gas Nozzle or
Gasless Nozzle
Brass Cable
Connector
FIGURE D.2
Liner trim length
Counter-clockwise
D-2
1-1/4"(31.8 mm)
Liner Trim Length