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B-3
OPERATION
B-3
DESIGN FEATURES AND
ADVANTAGES
UNIT FEATURES:
Undercarriage for Hand Mobility - Heavy duty 10"
(254mm) wheels and 4" (102mm) casters are factory
installed along with the handle. Handle can be used for
hanging the welding gun and work cable.
Gas Cylinder Platform - Factory installed on under-
carriage. It permits platform mounting and support of a
single gas cylinder. No full lifting of gas cylinder
required during loading.
Adjustable Flow Regulator - Accommodates CO
2
or
argon blend gas. Includes a cylinder pressure gauge
and a dual seal flow gauge.
Easy Accessability - Wire feeder enclosure protects
wire and wire drive from dirt, dust, and damage. Allows
easy top-access for "drop-in" wire reel loading and to
load or service the wire drive.
POWER SOURCE FEATURES:
10 Ft. (3.0m) Input Power Cable - Includes plug and
mating receptacle for 208/230V unit. Convenient rear
panel reconnect allows easy access for 208V re-con-
nection.
Power Switch - Front panel toggle switch turns input
power on and off.
Thermostatically Controlled Fans - Provides cooling
of transformer and other components only when
required. When used intermittently or at low current
procedures, the fan motors stay off, reducing the
amount of dust and dirt drawn into the machine. Also
reduces power consumption.
Electronic Overload Protection - Protects machine
from short circuit or high current overloading.
Power Source Line Voltage Regulation - Precise
SCR phase control circuit holds the voltage setting
constant to maintain weld quality even when the input
voltage fluctuates
+
/-10%.
Solid State Contactor - Output is turned on and off by
SCR's instead of a mechanical contactor providing
extra long life in highly repetitive welding applications.
Automatic Burnback - Provides proper burnback of
the electrode to prevent it from sticking in the weld pud-
dle at the end of a weld.
Output Terminals - Easily accessible in wire drive
section for quick cable connection and polarity rever-
sal.
Work Cable - 10 ft. (3.0m) long with work clamp.
WIRE FEEDER FEATURES:
Drop-in Wire Loading - Wire spindle snaps into
Readi-Reel-Adapter, included with SP-250, or most
any 2" (51mm) I.D. wire spool. The wire spindle drops
into the top loading SP-250 case design.
Accommodating standard 12” (305mm) and 8”
(203mm) diameter coils, the unique spindle and sup-
port design automatically provides appropriate de-reel-
ing drag to prevent wire reel overrun and loop-offs
without manual brake adjustments.
Tachometer Controlled Wire Drive - Precision con-
trol of permanent magnet motor provides proper wire
feed acceleration and speed accuracy, independent of
fluctuations in line voltage and wire loading. This
means reliable arc starting and weld consistency.
Low Speed Start - When the trigger is pulled, the wire
feeder feeds wire at low speed regardless of the set
wire feed speed until welding current is drawn or 2 sec-
onds has expired. This feature enhances starting and
makes setting stick out a snap. The 2 second limit per-
mits high speed loading of the gun and cable. In later
versions of the SP-250, a user selectable feature
allows the wire feeder to feed wire directly at the set
speed, thus bypassing the 2 second slow start.
Solid State Wire Feed Overload Protection - No cir-
cuit breaker to reset. Simply pull the trigger to resume
welding once the overload condition has been cleared.
Unique Drive Roll and Guide Tube Design - Long
life, precisely aligned guide tubes and drive rolls.
Quickly reloads by simply starting wire into ingoing
guide tube. Adjustable tension setting minimizes
'birdnesting', eliminates milling through the wire, and
gives positive feeding. The double groove, reversible
drive roll included with the SP-250 allows use of .030
(0.8mm) through .045 (1.2mm) diameter wire. Drive
Roll kits for other sizes and types of wire are also avail-
able.
Fast-Mate Gun Connector - European style gun con-
nector provides electrode, shielding gas and gun con-
IDEALARC SP-250
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