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C-9 C-9
RANGER 250
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CONNECTION OF THE LN-742 TO THE
RANGER 250 (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 out-
put 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 250 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 the “CV-WIRE” position.
6. Place the “IDLER” switch in the “AUTO” or “HIGH”
position as desired.
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-
cuits may be damaged. The engine governor setting is
preset at the factory – do not adjust above RPM spec-
ifications 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.
FIGURE C.7 – RANGER 250/LN-742 CONNECTION DIAGRAM
-
+
–
CAUTION