Unit Overload; Replacing Gun Contact Tip; Changing Drive Roll And Wire Inlet Guide - Miller MILLERMATIC DVI Owner's Manual

6-3. Unit Overload

Thermostats TP1 in rectifier SR1 and TP2 in stabilizer Z1 protect the unit from damage due to overheating. If TP1
and/or TP2 opens welding output will shut off. Wait several minutes before trying to weld.
Circuit breaker CB2 (Power switch) protects transformer T1 from overload. If CB2 opens, unit power will shut off.
Check input power supply, and press Power switch to turn unit back on.

6-4. Replacing Gun Contact Tip

Tools Needed:

6-5. Changing Drive Roll and Wire Inlet Guide

Tools Needed:
5/64 in
7/16 in
3
2
1
4
2
1
5
Y Turn Off power.
1 Nozzle
2 Contact Tip
Cut off welding wire at contact tip.
Remove nozzle.
Remove contact tip and install new
contact tip. Reinstall nozzle.
Ref. 800 797-C
1 Securing Screw
2 Inlet Wire Guide
Loosen screw. Slide tip as close to
drive rolls as possible without
touching. Tighten screw.
3 Anti-Wear Guide
Install guide as shown.
4 Drive Roll
The drive roll consists of two differ-
ent sized grooves. The stamped
markings on the end surface of the
drive roll refers to the groove on the
opposite side of the drive roll. The
groove closest to the motor shaft is
the proper groove to thread (see
Section 4-14).
Install correct drive roll for wire size
and type.
5 Drive Roll Securing Nut
Turn nut one click to secure drive
roll.
Ref. 802 990
OM-1330 Page 25