Miller Electric OM-230 manual Welding Power Source Duty Cycle And Overheating, Volt-Ampere Curves

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4-2. Welding Power Source Duty Cycle And Overheating

500

450

400

	350
AMPERES	300
	250
	200
WELD	150
	100
	50

10 20 30 40

% DUTY CYCLE

60% Duty Cycle At 200 Amperes

6 Minutes Welding 4 Minutes Resting

Overheating

0

15

Minutes

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.

50 60 70 80 90 100

40% Duty Cycle At 250 Amperes

4 Minutes Welding 6 Minutes Resting

A or V

OR

Reduce Duty Cycle

duty1 4/95 − 150 215-A

4-3. Volt-Ampere Curves

VOLTS

1	1 Normal Volt-Ampere Curves
35	The volt-ampere curves show the
30	normal minimum and maximum
	voltage and amperage output
	capabilities of the welding power

25	source. Curves of other settings fall
	between the curves shown.

20

15

10

5

0

0 100 200 300 400

AMPERES

ssb1.1 10/91 − 196 844 / S-0700

OM-230 693 Page 12