Section 6 − Maintenance &Troubleshooting; Routine Maintenance; Overload Protection; Drive Motor Protection And Tip Saver/Short Circuit Protection - Miller Millermatic 140 Auto-Set Owner's Manual

SECTION 6 − MAINTENANCE &TROUBLESHOOTING

6-1. Routine Maintenance

n = Check
* To be done by Factory Authorized Service Agent
Every
3
Months
l Unreadable Labels
Every
6
OR
Months
~ Inside Unit

6-2. Overload Protection

6-3. Drive Motor Protection And Tip Saver/Short Circuit Protection

A. Drive Motor Protection
Drive motor protection circuit protects drive motor from overload. If drive motor becomes inoperative, cycle unit power
off and back on again.
B. Tip Saver/Short Circuit Protection
The tip saver/short circuit protection extends contact tip life and protects internal components from damage. If contact
tip is shorted to workpiece, the unit shuts down the welding output, but the fan continues to run. To resume operation,
release gun trigger to reset unit. If the contact tip has stuck to the workpiece, release gun trigger, turn off unit, and
remove contact tip from workpiece. Check contact tip and replace if damaged. Turn on unit to continue operation.
OM-225 311 Page 30
.
A complete Parts List is available on-line at www.MillerWelds.com
Z = Change ~ = Clean
~ Weld Terminals
1
!
Disconnect power
before maintaining.
l = Replace
nl Weld Cables
.
Maintain more often
during severe conditions.
Reference
1 Supplementary Protector CB1
CB1 protects unit from overload. If
CB1 opens, unit shuts down.
Reset supplementary protector.
246 037-A