Miller Electric Inverter Rack manual Overload Protection, Troubleshooting

4-2. Overload Protection

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3

4

1Control Box

2Power Circuit Breaker In Racks For 230/460 Volt XMT 304/EX 300 Models And 230/460 Volt XMT 456/ Invision 456 Models);

Location Of 3-Phase Fuse Block (460/575 Volt XMT 304 Models And 575 Volt XMT 456/Invision 456 Models)

Each Power circuit breaker or fuse block protects the welding power source connected to it from overload.

If a Power circuit breaker opens, the matching welding power source shuts down. Manually reset the Power circuit breaker.

33-Phase Fuse Block In Racks For 460/575 Volt XMT 304 Models And 575 Volt XMT 456/Invision 456 Models

4Fuses

If fuse(s) in fuse block opens, the matching welding power source shuts down. To check fuse block, place line disconnect switch in Off position and open hinged fuse hold- er on applicable fuse block to ac- cess fuses. Check fuses, and re- place if necessary.

ST-801 703 / ST-801 767

4-3. Troubleshooting

	Trouble		Remedy
No weld output from any welding		Place line disconnect switch in On position (see Section 3-9).
power sources; units completely
inoperative.
		Check and replace line fuse(s), if necessary, or reset circuit breakers (see Section 3-9).
		Check for proper input power connections to rack (see Section 3-9).
No weld output from one welding pow-		For racks containing Power circuit breakers, place applicable Power circuit breaker in On position; for
er source.		racks containing fuse blocks, check fuses in applicable fuse block (see Section 4-2).
		Check for proper input power connections to welding power source (see Section 3-5).
		Check applicable welding power source according to its Owner’s Manual.

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