Section 3 − Specifications; Specifications; Duty Cycle And Overheating - Miller Millermatic 350P Technical Manual

3-1. Specifications

Rated Output
300 A at 350 A at
32 VDC, 32 VDC,
60% Duty 40% Duty
Cycle Cycle
* While idling
Wire Type and Diameter
Solid Steel Stainless Steel
.023 − .045 in. .030 − .045 in.
(0.8 − 1.1 mm) (0.8 − 1.1 mm)
Operating Temperature Range: −20C to +40C

3-2. Duty Cycle And Overheating

500
400
300
250
225
200
150
100
60% Duty Cycle At 300 Amperes
6 Minutes Welding
Overheating
TM-1327 Page 4
SECTION 3 − SPECIFICATIONS
Max. Open
Circuit
60 Hz
Voltage
90
Single-Phase
Three-Phase
Aluminum
.035 − .047 in.
(0.9 − 1.2 mm)
10 15 20 25 30
% DUTY CYCLE
4 Minutes Resting
0
Minutes
Amps Input at Rated Output
200 V 230 V 460 V
69 61 30
(1.7*) (1.5*) (0.75*)
34 30 15
(1.7*) (1.5*) (0.75*)
Wire Feed Speed
50−700 IPM H: 34 in. (864 mm)
(1.3−17.8 m/min) W: 19 in. (483 mm)
D: 41 in. (1041 mm)
Storage Temperature Range: -30C to + 50C
40 50 60 70 80 90 100
40% Duty Cycle At 350 Amperes
4 Minutes Welding
15
OR
Reduce Duty Cycle
575V KVA
24 13.1
(0.5*)
12 11.6
(0.5*)
Dimensions Net Weight
181 lb
(82 kg)
Duty Cycle is percentage of 10
minutes that unit can weld at rated
load without overheating.
If unit overheats, thermistors open,
output stops, and cooling fan runs.
Wait fifteen minutes for unit to cool.
Reduce amperage or voltage, or
duty cycle before welding.
NOTICE − Exceeding duty cycle
can damage unit and void warranty.
6 Minutes Resting
A or V
sduty1 5/95 / 217 442-A
Millermatic 350
KW
11.2
11.5