Section 3 − Installation; Specifications; Duty Cycle And Overheating - Miller Millermatic 300 Owner's Manual

3-1. Specifications

Rated Output Rated Output
300 A at 32 VDC, 240 A at 32 VDC,
60% Duty Cycle 100% Duty Cycle
* While idling
Wire Type and Diameter
Solid Steel Stainless Steel
.023 − 1/16 in .023 − .035 in
(0.6 − 1.6 mm) (0.6 − 0.9 mm)
Operating Temperature Range − −20C to +40C

3-2. Duty Cycle And Overheating

60% Duty Cycle At 300 Amperes
6 Minutes Welding
Overheating
SECTION 3 − INSTALLATION
Max. Open Max. Open
Circuit Voltage
38
Flux Cored
.030 − 1/16 in
(0.8 − 1.6 mm)
4 Minutes Resting
0
Minutes
Amps Input at Rated Output, 60 Hz; Three-Phase
200 V 230 V 460 V
54 47 23.5
(1.7*) (1.5*) (0.75*)
Wire Feed
Dimensions
Speed
25−700 H: 32 in (813 mm)
IPM IPM W: 19 in (483 mm) W: 19 in (483 mm)
(.65−17.8 D: 39 in (991 mm)
m/min)
Storage Temperature Range − -30C to + 50C
100% Duty Cycle At 240 Amperes
Continuous Welding
15
OR
Reduce Duty Cycle
575V KVA KW
19.0 18.6 13
(0.5*)
Net Weight
275 lb
(125 kg) (125 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.
A or V
sduty1 5/95 / 187 478-A
OM-1321 Page 9
void