Miller Electric OM-230 - Manual (Page 16)

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A complete Parts List is available at www.MillerWelds.com
OM-230 693 Page 12
4-2. Welding Power Source Duty Cycle And Overheating
4 Minutes Welding 6 Minutes Resting 6 Minutes Welding 4 Minutes Resting
Duty Cycle is percentage of 10
minutes that unit can weld at rated
load without overheating.
If unit overheats, Thermistor (T)
opens, 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.
Overheating
0
15
A or V
OR
Reduce Duty Cycle
Minutes
duty1 4/95 − 150 215-A
40% Duty Cycle At 250 Amperes 60% Duty Cycle At 200 Amperes
10 20 30 40 50 60 70 80 90 100
50
100
150
200
250
300
350
400
450
500
% DUTY CYCLE
WELD
AMPERES
4-3. Volt-Ampere Curves
ssb1.1 10/91 − 196 844 / S-0700
1 Normal Volt-Ampere Curves
The volt-ampere curves show the
normal minimum and maximum
voltage and amperage output
capabilities of the welding power
source. Curves of other settings fall
between the curves shown.
1
0
5
10
15
20
25
30
35
0 100 200 300 400
AMPERES
VOL
TS