Miller Electric Intellifire 250 Maintenance & Troubleshooting, Routine Maintenance, Overheating

SECTION 5 − MAINTENANCE & TROUBLESHOOTING

5-1. Routine Maintenance

Y Disconnect power	. Maintain more often
before maintaining.	during severe conditions.

3 Months

Clean and tighten output connections.

6 Months

Replace damaged or unreadable labels.

Repair or replace cracked cables and cords.

Blow out or vacuum inside.

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

1

1Rear Panel

2Safety Interlock Switch

2The safety interlock switch prevents the contactor from energizing with the wrapper off the unit.

Tools Needed:

3/8 in

Ref. ST-801 826-C

OM-184 227 Page 11