Section 3 - Operation - Miller Thunderbolt 225 Owner's Manual

3-1. Controls
3-2. Duty Cycle Chart And Volt-Ampere Curves
Duty Cycle is percentage of 10 minutes
that unit can weld at rated load without
overheating.
Y 20% Duty Cycle at 225 Amperes. Ex-
ceeding duty cycle can damage unit
and void warranty.
2 Minutes Welding
SECTION 3 – OPERATION
1
2
3
4
5
8 Minutes Resting
1
2
3
4
When welding below 150 amps,
use 30–150 A receptacle.
5
6
6
The volt-ampere curves show the minimum and maximum
voltage and amperage output capabilities. Curves of other
settings fall between the curves shown.
rduty1 5/95 – ST-001 836-A / ST-001 844-A
Amperage Control
Amperage Range Indicator
Electrode (30–150 A) Weld
Output Receptacle
Electrode (40–225 A) Weld
Output Receptacle
Work Weld Output Receptacle
Power Switch
Ref. ST-155 574 / Ref. SC-107 516-F
OM-116 Page 5