Miller Electric 1250, 1000 manual Installation, Specifications, Duty Cycle And Overheating

SECTION 4 − INSTALLATION

4-1.	Specifications
				Amperes Input at Rated			Amperes Input at Rated
Model	Rated Welding	Amperage/Voltage	Max	Load Output,			Load Output,
				60 Hz, Three-Phase			50 Hz, Three-Phase
	Output	Range DC	OCV−DC
				230 V	460 V	575 V	380 V	400 V	440 V	KVA	KW
	1000 A @ 44	100 − 1250 A In CC		180	90	72				73	53
1000		Mode
	Volts DC, 100%		66 VDC	5.8*	2.9*	2.4*				3.2*	0.5*
Amp		10 − 60 V In CV
	Duty Cycle
		Mode
	900 A @ 44	100 − 1250 A In CC					101	96	87	66.3	48.4
1250		Mode
	Volts DC, 100%		66 VDC				5.2*	5.0*	4.5*	3.4*	0.56*
Amp		10 − 60 V In CV
	Duty Cycle
		Mode
*While idling

4-2. Duty Cycle And Overheating

2000

Duty Cycle is percentage of 10 min-

utes that unit can weld at rated load

1800

1600

without overheating.

1400

DIMENSION 1000

If unit overheats, thermostat(s)

1200

opens, output stops, and cooling

1000

DIMENSION 1250

fan runs. Wait fifteen minutes for

WELD

unit to cool. Reduce amperage or

800

duty cycle before welding.

700

Y Exceeding duty

cycle

can

AMPERES

damage

unit

and

void

warranty.

600

500

10

20

30

40

50

60

70

80 90 100

% DUTY CYCLE

100% Duty Cycle

Continuous Welding

Overheating

0

A/V

15

OR

Minutes

Reduce Duty Cycle

duty1 4/95 / SA-191 157-A

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