Lincoln Electric POWER MIGTM 200 IM693 - Manual (Page 17)

B-5 B-5 OPERATION
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
instructions.
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.
7. Keep wire reel spindle brake tension to minimum
required to prevent excess reel over-travel which
may cause wire
“ loop-offs ” from coil.
8. Use proper drive rolls and wire drive idle roll pres-
sure for wire size and type being used.
FAN CONTROL
The fan is designed to come on when input power is
applied to the POWER MIG 200 and go off when
power is removed.
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
maximum 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 higher voltage tap than given on the recom-
mended procedure chart.
WIRE FEED OVERLOAD
PROTECTION
The POWER MIG has solid state overload protection
of the wire drive motor. If the motor becomes over-
loaded, 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 protection is done with reliable solid state elec-
tronics.
WELDING THERMAL OVERLOAD
PROTECTION
The POWER MIG 200 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
ambient temperature plus overload. The thermostats
automatically reset when the temperature reaches a
safe operating level and welding and feeding are
allowed again, when gun is retriggered.
Steel Thickness Wire Feed Speed/Voltage Tap Settings
Wire Dia. Gas Type WireType Polarity 18 gage 16 gage 14 gage 12 gage10gage 3/16 1/4 5/16 3/8 1/2
Outershield 3/4" ESO †
.035 75Ar/25CO
2
OS71M DC+ 250/D 300/E 350/F 500/G *500/G
.035 100%CO
2
OS71M DC+ 300/E 350/F 500/G
.045 75Ar/25CO
2
OS71M DC+ 200/E 225/F 250/G 250/G *250/G
Innershield 3/8" ESO
.035 NoneReq ’ d NR-211MP DC- 50/B 70/B 80/B 90/C 100/C
.045 NoneReq ’ d NR-211MP DC- 50/B 70/C 90/C 110/D *130/E
.045 NoneReq ’ d NR212 DC- 40/B 50/B 60/B 65/C 70/C 90/C 110/D *130/E *150/E *150/E
* Note- Requires Mutiple Pass .035 & .045 NR-211 MP is only
† Electrical Stickout recommended for a maximun of 5/16"
POWER MIG 200