Lincoln Electric IM536-D - Manual (Page 16)

SP-125 PLUS SP-125 PLUS
B-2 OPERATION
GENERAL DESCRIPTION
The SP-125 Plus is a complete semiautomatic con-
stant voltage DC arc welding machine. Included is a
solid state controlled, single phase constant voltage
transformer/ rectifier power source and a wire feeder
for feeding solid steel electrode and cored electrode.
The SP-125 Plus is ideally suited for individuals hav-
ing access to 115 volt AC input power, and wanting
the ease of use, quality and dependability of both gas
metal arc welding or GMAW (also known as MIG
welding) and the Innershield electrode process (self
shielded flux cored or FCAW). The SP-125 Plus is a
rugged and reliable machine that has been designed
for dependable service and long life.
RECOMMENDED PROCESSES
The SP-125 Plus can be used for welding mild steel
using the GMAW, single pass, process which requires
a supply of shielding gas or it can be used for the self
shielded, Innershield electrode process (FCAW). The
SP-125 Plus is configured for use with the GMAW
(MIG) process as delivered from the factory.
OPERATIONAL FEATURES AND
CONTROLS
The SP-125 Plus has the following controls as stan-
dard: Power ON/OFF Switch, Voltage Control, Wire
Speed Control, and a Circuit Breaker.
DESIGN FEATURES AND
ADVANTAGES
● Operates on 115 volt input — no special wiring
required.
● Solid state output control.
● “Cold electrode” until gun trigger is pressed for an
added measure of safety.
● Overload protection — incorporates both a thermo-
stat and a circuit breaker.
● Quality wire drive with electronic overload protec-
tion.
● Easy-to-set continuous range controls for precise
setting of arc voltage and wire speed.
● Continuous voltage control.
● “Quick Release” idle roll pressure arm is easily
adjusted.
● Reversible, dual groove drive roll. Drive roll will
feed .023-.035” (0.6- 0.9 mm) diameter wire.
● Accommodates both 8” (200 mm) diameter and 4”
(100 mm) diameter spools of wire.
● No external shielding gas is required when used
with Lincoln Innershield .035” (0,9 mm) NR®-211-
MP electrode.
● Easy to change polarity.
● Accepts optional Spot/Stitch Timer Kit.
WELDING CAPABILITY
The SP-125 Plus, as shipped, is rated at 90 amps, 18
volts, at 20% duty cycle on a ten minute basis. It is
capable of higher duty cycles at lower output currents.
LIMITATIONS
Arc Gouging cannot be performed with the SP-125
Plus. The SP-125 Plus is not recommended for pipe
thawing.
CONTROLS AND SETTINGS
Refer to Figures B.1a & B.1b.
1. Power ON/OFF Switch —
When the power is on the
fan motor will run and air will
be exhausted out the louvers
in the front of the machine.
The welding output and wire
feeder remain off until the
gun trigger is pressed.
2. Voltage Control — A contin-
uous control that gives full
range adjustment of power
source output voltage.
Voltage can be adjusted
while welding.
3. Wire Speed Control —
Controls the wire feed speed
from 50 – 400 in /min (1.3 –
10 m/min). The control can
be preset on the dial to the
setting specified on the SP-
125 Plus Application Chart
located on the inside of the
wire feed section door. Wire
speed is not affected when
changes are made in the
voltage control.
OFF
ON
ARC VOLTS
WIRE SPEED
ON
ARC VOLTS