Troubleshooting - Miller Electric Migmatic 271 Owner's Manual

Arc welding power source wire feeder
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5-4. Troubleshooting

Trouble
No weld output; wire does not feed.
No weld output; wire feeds.
Low weld output.
Low, high, or erratic wire speed.
No wire feed.
Remedy
Be sure line disconnect switch is On (see Section 3-8).
Replace building line fuse or reset circuit breaker if open.
Reset circuit breaker CB1 (see Section 5-2).
Secure gun trigger connections.
Check continuity of power switch S1 and replace if necessary.
Check main transformer T1 for signs of windig failure. Check continuity across windings and check for
proper connections. Check secondary voltages. Replace T1 if necessary.
Check continuity of thermostats TP1 and TP2. Replace TP1 and TP2 if necessary.
Check main control board PC1 and connections and replace if necessary.
Connect work clamp to get good metal to metal contact.
Replace contact tip (see gun Owner's Manual).
An overload condition occurred (see Section 5-3)
Check diodes in main rectifier SR1, and replace if necessary.
Check stabilizer Z1 for signs of winding failure. Check continuity across windings and check connections.
Replace Z1 if necessary.
Check main transformer T1 for signs of winding failure. Check continuity across windings and check con-
nections. Check secondary voltages. Replace T1 if necessary.
Check voltage switch(s). Replace if necessary.
Connect unit to proper input voltage or check for low line voltage (see Section 3-6).
Check input voltage jumper links and correct position if necessary (see Section 3-6).
Check main rectifier SR1, and replace if necessary.
Check voltage switch(s). Replace if necessary.
Readjust front panel settings (see Section 4-1).
Change to correct size drive rolls.
Readjust drive roll pressure (see Section 3-11).
Replace inlet guide, contact tip, and/or liner if necessary.
Check position of input jumper links (see Section 3-6).
Check Wire Speed control R1, and replace if necessary.
Check diodes in main rectifier SR1, and replace if necessary.
Check main control boarf PC1 and connections and replace if necessary.
Reset circuit breaker CB1 (see Section 5-2).
Rotate Wire Speed control R1 to higher setting (see Section 4-1).
Clear obstruction in gun contact tip or liner (see gun Owner's Manual).
OM-223 194 Page 19

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Migmatic 273Migmatic 333Migmatic 293Migmatic 383

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