Lincoln Electric SVM167-A service manual Avoiding Wire Feeding Problems, FAN Control

B-7 OPERATION B-7

Return to Section TOC

Return to Section TOC

Return to Section TOC

Return to Master TOC

Return to Master TOC

Return to Master TOC

9.When no more welding is to be done, close valve on gas cylinder (if used), momentarily operate gun trigger to release gas pressure, and turn off POWER MIG® 215.

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.

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® 215 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 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® 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 pro- tection is done with reliable solid state electronics.

WELDING THERMAL OVERLOAD PROTECTION

The POWER MIG® 215 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.

Return to Section TOC

Return to Master TOC

PROCEDURE CHART

Wire Feed Speed/Voltage Tap Settings

Wire Dia.

Gas Type

Wire Type

Polarity

18 gage

16 gage14 gage

12 gage10gage

3/16

1/4

5/16

3/8

1/2

Outershield

1" CTWD†

.035

75Ar/25CO2

OS71M

DC+

250/D

300/E

350/F

500/G

*500/G

.035

100%CO2

OS71M

DC+

300/E

350/F

500/G

.045

75Ar/25CO2

OS71M

DC+

200/E

225/F

250/G

250/G

*250/G

Innershield

5/8" CTWD†

.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

†Contact Tip to Work Distance * Note- Requires Multiple Pass

**.035 & .045 NR-211 MP are only recommended for a maximum steel thickness of 5/16"

POWER MIG® 215