Section 4 − Installation; Specifications; Duty Cycle And Overheating - Miller Electric Dimension NT 450, NT 500 Owner's Manual

4-1. Specifications

Rated
Welding Welding
Model Model
Voltage Range Voltage Range
Output
5 − 500A In CC
450 A @ 38
450 Amp 450 Amp Volts DC, 100% Volts DC 100%
Duty Cycle
10 − 38V In CV
*While idling

4-2. Duty Cycle And Overheating

Overheating
SECTION 4 − INSTALLATION
Amperage/
Max OCV−DC Max OCV−DC
78 VDC In
CC Mode For
60 Hz
Mode
80 VDC In CC
Mode For 50 Hz
78 VDC In
CV Mode For
60 Hz
Mode
80 VDC In CV
Mode For 50 Hz
100% Duty Cycle
Continuous Welding
0
Minutes
Amperes Input at Rated Load Output 50/60 Hz,
Three-Phase
230 V 380 V 400 V 440 V
57 34 33
*2.18 *1.11 *1.05 *.950
15
OR
Reduce Duty Cycle
460 V 575 V KVA
30 29 23 22.6
*1.04 *0.84 *0.87
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.
A/V
duty1 4/95 / 210 976-B
OM-2252 Page 13
KW
21.0
*0.29