Miller Electric Millermatic 350 - Manual (Page 45)

.
A complete Parts List is available at www.MillerWelds.com
OM-1327 Page 41
SECTION 6 − MAINTENANCE &TROUBLESHOOTING
6-1. Routine Maintenance
! Disconnect power
before maintaining.
.
Maintain more often
during severe conditions.
n = Check Z = Change ~ = Clean l = Replace
* To be done by Factory Authorized Service Agent
Reference
Every
3
Months
l Damaged Or Unreadable
Labels
l Repair Or Replace
Cracked Weld Cable
~ Clean And Tighten Weld
Terminals
n Check Gun Cable
Every
6
Months OR
Months
~ Inside Unit Clean Drive Rolls
6-2. 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.