Section 2 - Installation; Specifications; Duty Cycle And Overheating - Miller Electric Millermatic 250 Owner's Manual

2-1. Specifications

Rated Output
250 A at 28 VDC, 200 A at 28 VDC,
40% Duty Cycle 60% Duty Cycle
Wire Type and Diameter
Solid Steel Stainless Steel
.023 – .045 in .023 – .035 in
(0.6 – 1.2 mm) (0.6 – 0.9 mm)
* While idling

2-2. Duty Cycle And Overheating

60% Duty Cycle At 200 Amperes
6 Minutes Welding
Overheating
SECTION 2 – INSTALLATION
Max. Open-
Circuit
200 V 220 V
Voltage
32 50
2.3* 2.2*
Flux Cored
.030 – .045 in
(0.8 – 1.2 mm)
4 Minutes Resting
0
Minutes
Amps Input at Rated Output, 50 or 60 Hz, Single-Phase
230 V 380 V 415 V
45 44 26
2* 1.3*
Wire Feed Speed
50–670 IPM H: 37 in (940 mm)
(1.2–1.7 m/min) W: 19 in (483 mm)
D: 30-1/4 in (768 mm)
40% Duty Cycle At 250 Amperes
4 Minutes Welding
15
OR
Reduce Duty Cycle
460 V 575 V
24 22 18
1.2* 1* 0.8* 0.46*
Dimensions Net Weight
225 lb
(102 kg)
Duty Cycle is percentage of 10 min-
utes that unit can weld at rated load
without overheating.
If unit overheats, thermostat(s)
opens, output stops, and cooling
fan runs. Wait fifteen minutes for
unit to cool. Reduce amperage or
voltage, or duty cycle before
welding.
Y Exceeding duty cycle can
damage unit and
warranty.
6 Minutes Resting
A or V
duty1 4/95 – SB-150 215
OM-1308 Page 5
KVA KW
10 7.7
0.13*
void