Operation, Input line voltage variations, Wire feed overload protection – Lincoln Electric POWER MIG 11521 User Manual

Page 21: Welding thermal overload protection, Avoiding wire feeding problems, Fan control

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OPERATION

B-7

Power MIG® 215XT

INPUT LINE VOLTAGE VARIATIONS

High Line Voltage — Higher than rated input voltage
will result in output voltages higher than normal for a
given tap setting. If your input line is high, you may
want to select a lower voltage tap than given on the
recommended procedure chart.

Low Line Voltage — You may not be able to get max-
imum output from the machine if the line voltage is less
than rated input. The unit will continue to weld, but the
output may be less than normal for a given tap setting.
If your input line is low, you may want to select a high-
er voltage tap than given on the recommended proce-
dure chart.

WIRE FEED OVERLOAD
PROTECTION

The POWER MIG® 215XT has solid state overload
protection of the wire drive motor. If the motor becomes
overloaded, the protection circuitry turns off the wire
feed speed and gas solenoid. Check for proper size tip,
liner, and drive rolls, for any obstructions or bends in
the gun cable, and any other factors that would impede
the wire feeding. to resume welding, simply pull the
trigger. There is no circuit breaker to reset, as the pro-
tection is done with reliable solid state electronics.

WELDING THERMAL OVERLOAD
PROTECTION

The POWER MIG® 215XT has built-in protective ther-
mostats that respond to excessive temperature. They
open the wire feed and welder output circuits if the
machine exceeds the maximum safe operating tem-
perature because of a frequent overload, or high ambi-
ent temperature plus overload. The thermostats auto-
matically reset when the temperature reaches a safe
operating level and welding and feeding are allowed
again, when gun is retriggered.

9. When no more welding is to be done, close valve on

gas cylinder (if used), momentarily operate gun trig-
ger to release gas pressure, and turn off POWER
MIG® 215XT.

NOTE: When using Innershield electrode, the gas

nozzle may be removed from the insulation on
the end of the gun and replaced with the gas-
less nozzle. This will give improved visibility
and eliminate the possibility of the gas nozzle
overheating.

AVOIDING WIRE FEEDING
PROBLEMS

Wire feeding problems can be avoided by observing
the following gun handling procedures:

1. Do not kink or pull cable around sharp corners.
2. Keep the gun cable as straight as possible when

welding or loading electrode through cable.

3. Do not allow dolly wheels or trucks to run over

cables.

4. Keep cable clean by following maintenance instruc-

tions.

5. Use only clean, rust-free electrode. The Lincoln

electrodes have proper surface lubrication.

6. Replace contact tip when the arc starts to become

unstable or the contact tip end is fused or deformed.