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WARNING
• Do not touch electrically live
parts or electrode with skin or
wet clothing.
• Insulate yourself from work and
ground.
ELECTRIC
• Always wear dry insulating
SHOCK
gloves.
can kill
• Keep your head out of fumes.
• Use ventilation or exhaust to
remove fumes from breathing
zone.
FUMES AND GASES
can be dangerous
• Keep flammable material away.
• Do not weld upon containers
which have held combustibles.
WELDING SPARKS can
cause fire or
explosion
• Wear
protection.
ARC RAYS
can burn
IMPORTANT SAFETY NOTE: In 2T mode {refer 2.2 (h)}, this
DC Constant Voltage wire welder provides "COLD" electrode
when the gun trigger is not operated. Conversely, the output
terminals are "LIVE" when the gun trigger is "activated" when
pressed in 2T mode, or triggered on in 4T mode.
2.1 Duty Cycle
The machine is rated at the following duty cycles:
Duty Cycle
(1)
30%
60%
100%
(1)
Based on 10 min. time period (i.e., for 60% duty cycle, it is 6
minutes actual welding and 4 minutes with no welding output,
but with the input power remaining on keeping the cooling fan
operative.)
Page 10
Section 2 - OPERATING INSTRUCTIONS
eye,
ear
and
body
Amps
Volts
255
26.5
180
23
140
21
2.2 Control Panel
Note: Burnback control located inside wire bay area (not shown).
a)
Power Switch
The mains power switch is incorporated in the "coarse"
output voltage control rotary switch. In the "OFF" position
the input mains power is switched off.
b)
Pilot Light
This light illuminates when the input mains power is
switched on.
c)
Volts Control
The output voltage is controlled by two rotary switches.
One rotary switch provides four "course" voltage setting as
well as switching the machines power on. The other rotary
switch provides the user with a selection of eight fine
voltage settings. The selection between these two rotary
switches allows the user to select any one of thirty-two
welding voltages.
The approximate weld voltages for the rotary switch
positions are:
Coarse
A
A
A
A
A
A
A
A
C
C
C
C
C
C
C
C
d)
Wire Feed Speed Control *
Use this control to adjust the speed at which the electrode
wire feeds when welding. This is in effect a current control
as the power source will deliver the current necessary to
melt the wire. The higher the speed, the more current will
be required. Wire feed speed range is approximately 1 to
20 meters/min (40 to 790 inches/min.).
Operation of the gun trigger switches the wire feed motor
on and off, depending upon the trigger mode setting. The
wire feed motor is dynamically braked to minimise wire
overrun after welding has ceased.
Welding voltage is available immediately the gun trigger is
operated. When welding is stopped there is a delay to allow
the electrode to burn back slightly and prevent sticking in
the crater. [See Burnback Control 2.2 e)]
REDI-MIG 255
Fine
Volts
Coarse
a
12.0
B
b
12.5
B
c
13.0
B
d
13.5
B
e
14.0
B
f
14.5
B
g
15.0
B
h
15.5
B
a
20.0
b
21.0
c
22.0
d
23.0
e
24.0
f
25.0
g
26.0
h
27.0
Fine
Volts
a
16.0
b
16.5
c
17.0
d
17.5
e
18.0
f
18.5
g
19.0
h
19.5
IMA 598B
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