Section 5 − Maintenance & Troubleshooting; Routine Maintenance; Overheating; Automatic Shutdown Protection - Miller Electric Intellifire 250 Owner's Manual

SECTION 5 − MAINTENANCE & TROUBLESHOOTING

5-1. Routine Maintenance

3 Months
Clean and tighten
output connections.
6 Months
Replace damaged or
unreadable labels.

5-2. Overheating

Thermostats TP1, TP2, and TP3 protect the unit from damage due to overheating. If one or more of the heat sinks get
too hot, TP1, TP2, and/or TP3 opens and output stops. The fan keeps running to cool the heat sink(s). Wait several
minutes before trying to heat.

5-3. Automatic Shutdown Protection

This unit automatically shuts down upon sensing certain fault conditions, such as an out-of-range frequency condition,
short circuit load condition, or an open circuit (no load) condition. The unit also has automatic voltage limiting and
power ratio limiting, which limits the output power based on improper load impedance.

5-4. Safety Interlock Switch

Tools Needed:
3/8 in
Y Disconnect power
before maintaining.
Repair or replace
cracked cables
and cords.
Blow out or vacuum
inside.
1
.
Maintain more often
during severe conditions.
1 Rear Panel
2 Safety Interlock Switch
2 The safety
prevents the
energizing with the wrapper off the
unit.
interlock switch
contactor from
Ref. ST-801 826-C
OM-184 227 Page 11