Overload Protection - Lincoln Electric 125 Operator's Manual

WIRE FEEDER WELDERS (125, 140)

OVERLOAD PROTECTION

Output Overload
The WIRE FEEDER WELDERS (125 and 140 MODELS) are
equipped with a circuit breaker and a thermostat which protects
the machine from damage if maximum output is exceeded. The
circuit breaker button will extend out when tripped. The circuit
breaker must be manually reset.
Thermal Protection
The WIRE FEEDER WELDERS (125 and 140 MODELS) have 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 reasonable operating
temperature. This is an automatic function of the WIRE FEEDER
WELDERS (125 and 140 MODELS) and does not require user
intervention. The fan continues to run during cooling.
Electronic Wire Drive Motor Protection
The WIRE FEEDER WELDERS (125 and 140 MODELS) have built-in
protection for wire drive motor overload.
CHANGING LINER
NOTICE: The variation in cable lengths prevents the interchange-
ability of liners. Once a liner has been cut for a particular gun, it
should not be installed in another gun unless it can meet the
liner cutoff length requirement. Refer to Figure D.2.
1. Remove the gas nozzle from the gun by unscrewing 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 connector at the wire feed-
er 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 dif-
fuser 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.
8. Screw the gas diffuser onto the end of the gun tube and
securely tighten.
9. Replace the contact tip and nozzle.
Set Screw Brass Cable
Connector
Liner Assembly
(Liner bushing to be sealed tight against
brass cable connector)
Liner trim length
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 collars
reach a stop. Then pull the collars off the gun handle. If the col-
lars are difficult 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 lock-
ing rib. See Figure D.3.
FIGURE D.3
D 2
MAINTENANCE
1-1/4"(31.8 mm)
Liner Trim Length
Gas Diffuser
Gas Nozzle or
Gasless Nozzle
FIGURE D.2
Counter-clockwise