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Summary
MIG
SERIES
EQUIPMENT
MIG SERIES
EQUIPMENT
R251/R311
◆
4M MB-24 MIG Gun – 25M2
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Contact tip •1.0mm Fitted 0.8mm Fitted
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3M Gas Hose 8*13.5
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300 A earth clamp with 3M cable
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3M Power cable
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Drive Rolls
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Operating Manual
1.10 Packaged Items
1.11 Duty Cycle
The rated duty cycle of a Welding Power Source is a statement of the time it may be operated
at its rated welding current output without exceeding the temperature limits of the insulation of
the component parts. To explain the 10 minute duty cycle period the following example is used.
Suppose a Welding Power Source is designed to operate at a 30% duty cycle, 300 amperes at
29 volts. This means that it has been designed and built to provide the rated amperage (300 A)
for 3 minutes, i.e. arc welding time, out of every 10 minute period (30% of 10 minutes is 3 minutes).
During the other 7 minutes of the 10 minute period the Welding Power Source must idle and be
allowed to cool.
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Safe
Operating
Region
MIG(R251)
MIG(R311)
Welding Current (amps)
2.1 Layout For The Panel R221
1. Power Indicator
The green power indicator will be illuminated when the welder is turned ON and indicates
the presence of power.
3. JOB and SAVE
You can press JOB to select the memory records that you have saved before from 1-9.
For the new setting of present base current Amps ,just press SAVE.
4. Digital Ammeter
The digital meter is used to display the pre-set (preview) amperage in STICK / Mig modes
and actual welding amperage of the power source when welding, it is also used to
display parameters from selecting function button 6.
4
5
3
11
2
1
10
6
12
14
13
9
8
7
DO NOT TOUCH the electrode wire while it is being fed through the system. The electrode
wire will be at welding voltage potential.
WARNING
2. Thermal Overload Indicator Light
This welding power source is protected by a self resetting thermostat. The indicator will
illuminate if the duty cycle of the power source has been exceeded. Should the thermal
overload indicator illuminate the output of the power source will be disabled. Once the
power source cools down this light will go OFF and the over temperature condition will
automatically reset. Note that the mains power switch should remain in the on position
such that the fan continues to operate thus allowing the unit to cool sufficiently. Do not
switch the unit off should a thermal overload condition be present.
Operation
