Section 2 - Installation; Specifications; Duty Cycle And Overheating - Miller AC 251 Stick Owner's Manual

2-1. Specifications

Input Voltage
Rated Welding Output
Used
190 A @ 27 Volts AC,
230 V
25% Duty Cycle
400 V 190 A @ 27 Volts AC,
25% Duty Cycle

2-2. Duty Cycle And Overheating

300
250
200
150
100
50
25% Duty Cycle When The 50 Volt Output Terminal Is Used
2-1/2 Minutes Welding
Overheating
SECTION 2 – INSTALLATION
Amp
Range AC
35–195 A
35–195 A
Height: 530 mm; Width: 395 mm; Length: 630 mm
Rated Output
20 25 30 35 40 50 60 70 80 90 100
7-1/2 Minutes Resting
0
Minutes
Maximum
IP
Open-Circuit
Rating
50/60 Hz, Single-Phase
Voltage AC Voltage AC
50–68 V
IP21
50–68 V
Dimensions:
15
OR
Reduce Duty Cycle
Amperes Input at
Rated Load Output,
KVA
230 V 400 V
43 25 6.2
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
duty cycle before welding.
Y Exceeding duty cycle can
damage unit
warranty.
A
OM-194 414 Page 3
Weight
35 kg
and void
duty1 4/95