Miller Electric XMT 4-Rack manual Overload Protection, Troubleshooting, Rack Trouble

5-2. Overload Protection

1 Power Circuit Breakers CB1-CB4

Each Power circuit breaker CB1 through CB4 protects the welding power source connected to it from overload.

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

1

ST-158 333 / Ref. ST-155 839 / Ref. ST-151 269-B

Figure 5-2. Circuit Breaker Locations

5-3. Troubleshooting

WARNING

ELECTRIC SHOCK can kill.

• Do not touch live electrical parts.

• Turn Off welding power sources, and disconnect input power to rack before inspecting, maintaining, or servicing.

Troubleshooting to be performed only by qualified persons.

Table 5-1. Rack Trouble

Trouble Remedy

Section

No weld output from any welding power sources; units completely inoperative.

No weld output from one welding power source.

Place line disconnect switch in On position.

Check line fuse(s) and replace if needed. Reset circuit breakers.

Check for proper input power connections to rack.

Place applicable Power circuit breaker in On position.

Check for proper input power connections to welding power source.

Check applicable welding power source according to its manual.

4-6

4-6

4-6

5-2

4-3

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