3-3. Duty Cycle And Overheating

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.

NOTICE − Exceeding duty cycle can damage unit and void warranty.

100% Duty Cycle At 675 Amperes

Continuous Welding

Overheating

0

A/V

 

15

 

OR

Minutes

Reduce Duty Cycle

 

 

 

 

 

 

 

 

 

 

 

 

duty1 4/95 − 206 789-A

3-4.

Volt-Ampere Curves

 

 

 

 

 

 

 

 

 

 

 

 

 

CV MODE

 

 

 

 

Volt-ampere curves show minimum

 

 

 

 

 

 

 

 

 

 

and maximum voltage and amper-

 

 

 

 

 

 

 

 

 

 

 

age output capabilities of unit.

 

80

 

 

 

 

 

 

 

 

 

Curves of other settings fall be-

 

 

 

 

 

 

 

 

 

 

tween curves shown.

 

70

 

 

 

 

 

 

 

 

 

. This volt-ampere curve repre-

 

 

 

 

 

 

 

 

 

 

sents the dynamic output of the

 

 

 

 

 

 

 

 

 

 

 

 

60

 

 

 

 

 

 

 

 

 

unit with a static load.

 

 

 

 

 

 

 

 

 

 

 

VOLTAGE

50

 

 

 

 

 

 

 

 

 

 

40

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

30

 

 

 

 

 

 

 

 

 

 

 

20

 

 

 

 

 

 

 

 

 

 

 

10

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

 

 

 

 

0

100

200

300

400

500

600

700

800

900

1000

 

 

 

 

 

 

AMPERES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

va_curve1 4/95 − 221 502-A

OM-201 540 Page 12

 

 

 

 

 

 

 

 

 

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Miller Electric Auto Axcess 675 manual Duty Cycle And Overheating, Volt-Ampere Curves, 100% Duty Cycle At 675 Amperes