MAINTENANCE
Safety Precautions
WARNING
ELECTRIC SHOCK can kill.
•Have a qualified individual install and service this equipment.
•Turn the input power off at the fuse box before working on equipment.
•Do not touch electrically hot parts.
General Maintenance
1.The fan motor has sealed ball bearings which requires no service.
2.In dusty locations dirt may clog the air channels causing the welder to run hot. Under these conditions carefully blow out the welder at regular intervals.
3.Keep the electrode and work cable connection tight.
4.Every twelve months or at the first indication of a binding current pointer, turn the input power off and remove the left case side. Wipe the pointer guide bar clean and lubricate with graphite grease.
5.When cleaning the current pointer, clean the reactor quadrant teeth, drive gear and pinion. Lubricate with graphite grease.
TROUBLESHOOTING
Safety Precautions
WARNING
ELECTRIC SHOCK can kill.
•Have a qualified individual install and service this equipment.
•Turn the input power off at the fuse box before working on equipment.
•Do not touch electrically hot parts.
Rectifier Troubleshooting
1.Turn the input power off.
2.Disconnect all input and output leads from the rectifier bridge.
3.Connect an ohmmeter between the DC positive (red) terminal and one of the AC (yellow) termi- nals. Note the ohmmeter reading using the 10 to 100 scale.
4.Reverse the ohmmeter leads. Note the readings.
5.The reading taken in steps 3 and 4 should be different. If the readings are the same and near zero, the rectifier has shorted. IF the readings are the same and near full scale, the rectifier has failed open.
6.Repeat steps 3, 4 and 5 between the DC posi- tive (red) terminal and each of the AC (yellow) terminals.
7.Repeat steps 3, 4 and 5 between the DC nega- tive (black) terminal and each of the AC (yel- low) terminals.
NOTE: Since it is unlikely that all rectifiers of a full wave bridge would fail simultaneously, check the test method and the ohmmeter if the checking indicates that all rectifiers have failed.
– 13 –