Maintenance & Troubleshooting | Miller Electric XMT 4-Rack manual

Ref. S-0092-G

Table 4-2. Electrical Service Requirements*

Input Voltage	230	460

Recommended Standard Fuse Or Circuit Breaker Rating In Amperes1	250	125
Input Conductor Size In AWG/Kcmil2	1/0	4
Max Input Conductor Length In Feet (Meters)3	229 (70)	397 (121)
Grounding Conductor Size In AWG/Kcmil4	4	6

*These values are calculated from the 1993 edition of the National Electrical Code (NEC).

1 Recommended fuse or circuit breaker size is that closest to 150% of rated input amperage of the welding power source. Article 630-12(a) of NEC allows fuse or circuit breaker sizing up to 200% of rated input amperage.

2 Input conductor size is for insulated copper wire with 75° C rating with not more than three single current-carrying conductors in a cable or raceway (Table 310-16 of NEC).

3 Maximum length is to prevent more than a 3% voltage drop between service entrance and input terminals of the welding power source (Articles 210-19(a) and 215-2(b) of NEC).

4 The grounding conductor shall be colored or identified as specified in the NEC. Grounding conductor size for copper wire is not required to be larger than input conductor (Article 250-95 of NEC).

SECTION 5 – MAINTENANCE & 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.

Maintenance to be performed only by qualified persons.

5-1. Routine Maintenance

3 Months

Tape Or

Replace

Cracked

Cables

	Replace
See	Unreadable
Section	Labels
7

Clean

And

Tighten Weld

Connections

Turn Off all power before maintaining.

	6 Months
OR	Blow Out
OR	Or
	Vacuum
	Inside
	During Heavy Service,
– –	Clean Monthly

ST-151 267-B

Figure 5-1. Maintenance Schedule

OM-815 Page 11