Section 7 − Maintenance &Troubleshooting; Routine Maintenance; Overheating; Ground Clamp And Gun Connections - Miller Electric Millermatic 350P Aluminum Owner's Manual

SECTION 7 − MAINTENANCE &TROUBLESHOOTING

7-1. Routine Maintenance

n = Check
* To be done by Factory Authorized Service Agent
Every
l Damaged Or Unreadable
3
Labels
Months
l Damaged Gas Hose
Every
OR
6
Months
~ Inside Unit
After
Each
Spool
Of Wire
~ Gun Liner
.
When using a 16 lb spool of wire per day, blow out gun liner after each spool of wire.

7-2. Overheating

Thermistors RT1 and RT2 protect the unit from damage due to overheating. If output diode heatsink or IGBT heatsink gets too hot, RT1 and/or RT2
opens and output stops. The fan keeps running to cool the unit. Wait several minutes before trying to weld.

7-3. Ground Clamp And Gun Connections

Clean and tighten ground clamp and gun connections. Be sure that ground clamp is connected to a clean, paint-free
surface on the workpiece.
OM-254915 Page 52
.
A complete Parts List is available at www.MillerWelds.com
Z = Change ~ = Clean
l Repair Or Replace
Cracked Weld Cable
l Cracked Or Damaged
Cord
~ Clean Drive Rolls
l = Replace
~ Clean And Tighten Weld n Check Gun Cable
Terminals
!
Disconnect power
before maintaining.
.
Maintain more
often during
severe conditions.
Reference