Lincoln Electric Ranger 305D Service Manual page 35

C-9
CONNECTION OF THE LN-742 TO THE
RANGER 305D.
(SEE FIGURE C.7.)
1. Shut the welder off.
2. Connect the electrode cable from the LN-742
to the "+" terminal of the welder. Connect the work
cable to the "-" terminal of the welder.
NOTE: Figure C.7 shows the electrode connected for
positive polarity. To change polarity, shut the welder
off and reverse the electrode and work cables at the
output terminals.
NOTE: Welding cable must be sized for current and
duty cycle of application.
3. Connect the K619 Control Cable to the 14-pin
amphenol on the Ranger 305D and the input cable
plug on the LN-742..
4. Set the "VOLTMETER" switch to "+" or "-" depend-
ing on the polarity chosen.
5. Set the "MODE" switch to "CV-WIRE" position.
6. Place the "IDLER" switch in the "AUTO" or "HIGH"
position, as desired.
FIGURE C.7 - Ranger 305D/LN-742 CONNECTION DIAGRAM
14-PIN
AMPHENOL
ACCESSORIES
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-
+
TO WORK
RANGER 305D
CAUTION
An increase of the high idle engine RPM by changing
the governor setting or overriding the throttle linkage
will cause an increase in the AC auxiliary voltage. If
this voltage goes over 140 volts, wire feeder control cir-
cuit may be damaged. The engine governor setting is
preset at the factory - do not adjust above RPM speci-
fications listed in this manual.
------------------------------------------------------------------------
7. Place the "WELD TERMINALS" switch in the
"REMOTELY CONTROLLED" position.
8. Adjust wire feed speed and voltage at the LN-742..
9. Set the ARC control to "0" initially and adjust to
suit.
TO LN-742 INPUT
CABLE PLUG
K619 CONTROL CABLE
C-9
ELECTRODE CABLE ELECTRODE CABLE
TO WIRE FEED UNIT TO WIRE FEED UNIT