Return to Section TOC
Return to Section TOC
Return to Section TOC
Return to Section TOC
Return to Master TOC
Return to Master TOC
Return to Master TOC
Return to Master TOC
TROUBLESHOOTING & REPAIR | |||||
TROUBLESHOOTING GUIDE |
|
| Observe Safety Guidelines | ||
|
| detailed in the beginning of this manual. | |||
|
|
|
| ||
PROBLEMS |
| POSSIBLE AREAS OF | RECOMMENDED | ||
(SYMPTOMS) |
| MISADJUSTMENT(S) | COURSE OF ACTION | ||
|
|
|
|
|
|
|
| OUTPUT PROBLEMS (Continued) |
|
|
|
|
|
|
| ||
No open circuit voltage output but | 1. Check the input voltage at the | 1. | Check for loose or broken con- | ||
wire feeds normally when gun trig- | machine. Input voltage must |
| nections at the output terminals, | ||
ger is pulled. |
| match the rating plate and the |
| the chokes, the capacitor bank | |
|
| reconnect panel. |
| and all heavy current carrying | |
|
|
|
| leads. See Wiring Diagram. | |
|
| 2. The gun may be faulty. Check |
|
|
|
|
| or replace. | 2. | Make sure that the transformer | |
|
|
|
| secondary | leads are securely |
|
|
|
| connected to the SCR rectifier | |
|
|
|
| assembly. |
|
|
|
| 3. | Perform | the SCR Rectifier |
|
|
|
| Assembly Tests. | |
|
|
| 4. | Perform | Main Transformer |
|
|
|
| Test. |
|
|
|
| 5. | The control board may be faulty. | |
|
|
|
| Replace. |
|
|
|
|
| ||
Wire feeds but welding output is low | 1. Make sure that the proper wire | 1. | Check for loose or faulty con- | ||
causing wire to “stub”. | Welds are | and procedures are being used. |
| nections of the heavy current | |
“cold”. Machine cannot obtain full |
|
| carrying leads. | ||
rated output of 200 amps at 28 volts. | 2. Check gun and work cable for |
|
|
| |
|
| loose or faulty connections. | 2. | The output capacitor bank may | |
|
|
|
| be faulty. Check for loose con- | |
|
|
|
| nections at the capacitors. Also | |
|
|
|
| check for leaky capacitors. | |
|
|
|
| Replace if necessary. | |
|
|
|
| WARNING: The liquid elec- | |
|
|
|
| trolyte in these capacitors is | |
|
|
|
| toxic. Avoid contact with any | |
|
|
|
| portion of your body. | |
|
|
| 3. | Perform | the SCR Rectifier |
|
|
|
| Assembly Tests. | |
|
|
| 4. | Perform the Main Transformer | |
|
|
|
| Test. |
|
|
|
| 5. | The control board may be faulty. | |
|
|
|
| Replace. |
|
|
|
|
|
|
|
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
