Duty Cycle And Overheating - Miller Electric Miller DU-OP Owner's Manual

4-6. Duty Cycle And Overheating

Dual Operator Mode − 40% Duty Cycle At 275 Amperes From Each Side
Single Operator Mode − 40% Duty Cycle At 550 Amperes From Welder B side (Right)
4 Minutes Welding
Overheating
OM-494 Page 12
6 Minutes Resting
0
15
Reduce Duty Cycle
Minutes
Duty Cycle is percentage of 10 min-
utes that unit can weld at rated load
without overheating.
Y Exceeding duty cycle can
damage unit
warranty.
If a weld module overheats, the
High Temperature light goes on and
the thermostat opens to stop weld
output to that module. Wait fifteen
minutes for module to cool. Reduce
amperage, voltage, or duty cycle
before welding.
This unit has separate duty cycle
ratings for each operating mode. If
the unit is operated in the dual oper-
ator mode, the unit is rated at 40%
duty cycle. This means each side of
the unit can be operated at 275 am-
peres at 40% duty cycle.
When the unit is operated in the
single operator mode, the Welder B
side (right) is rated at 40% duty
cycle (550 A at 40% duty cycle).
A or V
OR
Ref. rduty1 5/95 − 194 313-A
and void