Section 3 − Installation; Specifications; Duty Cycle And Overheating - Miller Electric SHOPMATE 300 Owner's Manual

3-1. Specifications

A. 300 Models
Rated Welding Amperage/Voltage
Output Output Range Range
275 A @ 31 Volts 275 A @ 31 Volts
10 − 35V 10 − 35V
DC, 50% Duty Cycle
*While idling
B. 300 DX Models
Rated Welding Amperage/Voltage
Output Output Range Range
5 − 400A In CC
275 A @ 31 Volts
Mode
DC 50% Duty DC, 50% Duty
10 − 35V In CV
Cycle
Mode
*While idling

3-2. Duty Cycle And Overheating

Overheating
SECTION 3 − INSTALLATION
Max
OCV−DC OCV−DC
200 V
85 VDC 85 VDC
*1.66
Max OCV−DC Max OCV−DC
85 VDC In
CC Mode
85 VDC In
CV Mode
50%dutycycle
5 Minutes Welding
0
Minutes
Amperes Input at Rated Load Output 60 Hz,
Single-Phase
230 V 460 V
66 57 29
*1.66 *0.83
Amperes Input at Rated Load Output 60 Hz,
Single-Phase
200 V 230 V 460 V
66 57
*1.66 *1.66
5 Minutes Resting
15
OR
Reduce Duty Cycle
575 V KVA
23 13
*0.66 *0.66
575 V KVA
29 23 13
*0.83 *0.66 *0.66
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.
Y Exceeding duty cycle can
damage unit
warranty.
A/V
duty1 4/95 / 225 765-A
OM-225 757 Page 9
KW
11.2
*0.26
KW
11.2
*0.26
and void