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– 14 –
When a forceful “digging” arc is required, usually for
vertical and overhead welding, use a higher “Current
Range Selector” setting and lower open circuit
voltage. For example: to obtain 175 amps and a
forceful arc, set the “Current Range Selector” to the
240-160 position and the “Fine Current Adjustment”
setting to get 175 amps.
DO NOT attempt to set the “Current Range Selector”
between the five points designated on the nameplate.
------------------------------------------------------------------------
These switches have a spring loaded cam which
almost eliminates the possibility of setting this switch
between the designated points.
Idler Operation
Start the engine with the “Idler Control” switch in
“High Idle” position. Allow it to run at high idle speed
for several minutes to warm the engine. The
operating speeds are as follows:
The idler is controlled by an “Idler Control” toggle
switch on the welder control panel. The switch has
two positions as follows:
1. In the “High” position, the idler is off, and the
engine runs at the high speed controlled by the
governor.
2. In the “Automatic” / position, the
idler operates as follows:
a. When welding or drawing power for lights or
tools (approximately 100-150 watts minimum)
from the receptacles, the engine operates at full
speed.
b. When welding ceases or the power load is
turned off, a preset time delay of about 15
seconds starts. This time delay cannot be
adjusted.
c. If the welding or power load is not re-started
before the end of the time delay, the idler
reduces the engine to low idle speed.
ORDERING
INFO.
ENGINE FULL
LOAD
HIGH
IDLE
LOW
IDLE
K1314-
ALL
Perkins
Diesel
1725 1800 1350
WELDER OPERATION
Duty Cycle
The NEMA output rating of the 350-SA is 250
amperes at 30
(1)
arc volts on a 60% duty cycle. Duty
cycle is based on a ten minute period; thus, the
welder can be loaded at rated output for six minutes
out of every ten minute period.
(1)
The Lincoln ‘plus output” rating at 60% duty cycle
is 250 amperes at 40 volts.
Control of Welding Current
DO NOT TURN THE “CURRENT RANGE
SELECTOR” WHILE WELDING because the
current may arc between the contacts and damage
the switch.
------------------------------------------------------------------------
The “Current Range Selector” provides five
overlapping current ranges. The “Fine Current
Adjustment” adjusts the current from minimum to
maximum within each range. Open circuit voltage is
also controlled by the “Fine Current Adjustment”
permitting control of the arc characteristics.
A high open circuit voltage setting provides the soft
“buttering” arc with best resistance to pop-outs
preferred for most welding. To get this characteristic,
set the “Current Range Selector” to the lowest setting
that still provides the current you need and set the
“
Fine Current Adjustment” near maximum. For example:
to obtain 175 amps and a soft arc, set the “Current
Range Selector” to the 190-120 position and then adjust
the “Fine Current Adjustment” for 175
amps.
ELECTRIC SHOCK can kill.
• Do not touch electrically live parts or
electrode with skin or wet clothing.
• Insulate yourself from work and ground.
FUMES & GASES can be dangerous.
• Keep your head out of the fumes.
• Use ventilation or exhaust to remove
fumes from breathing zone.
WELDING SPARKS can cause fire or
explosion.
• Keep flammable material away.
ARC RAYS can burn.
• Wear eye, ear, and body protection.
WARNING
CAUTION
CAUTION