Front Panel Controls; Section 5 – Operating The Welding Generator - Miller Bobcat 250 NT Owner's Manual

SECTION 5 – OPERATING THE WELDING GENERATOR

5-1. Front Panel Controls

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1 Engine Control Switch
Use switch to start engine, select speed, and
stop engine. In Run/Idle position, engine runs
at idle speed at no load, and weld/power speed
under load. In Run position, engine runs at
weld/power speed.
.
Place switch in Run position to operate
most MIG equipment.
2 Engine Choke Control
Use control to change engine air-fuel mix.
To Start: pull out choke and turn Engine Con-
trol switch to Start position. Release switch
and slowly push choke in when engine starts.
.
If the engine does not start, let engine
come to a complete stop before attempt-
ing restart.
To Stop: turn Engine Control switch to Off
5
position.
3 Engine Hour Meter
4 Weld Process Selector Switch
Y Do not switch under load.
Use switch to select type of weld output.
Use a positive (+) position for Direct Current
Electrode Positive (DCEP) and a negative (–)
position for Direct Current Electrode Negative.
Use AC position for alternating current.
5 Coarse Range Switch
Y Do not switch under load.
Use switch to select weld amperage range
when Weld Process Selector switch is in Stick/
Tig position, or voltage range when switch is in
Wire position.
6 1 2
Shown with optional
receptacle covers.
.
For best arc starts and when using weld
and generator power together, use a low
Coarse Range setting with the Fine con-
trol set at 7 or higher.
6 Fine Control
Use control to select weld amperage (Stick/
Tig) or voltage (Wire) within the range selected
by the Coarse Range switch. Control may be
adjusted while welding.
Set control at 10 for maximum generator pow-
er.
Weld output would be about 124 A DC based
on control settings shown (80% of 60 to 140
A). Settings shown are typical for welding with
a 7018 (1/8) electrode.
.
See Sections 5-2 thru 5-4 for typical pro-
cess connections and control settings.
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Ref. 200 017
OM-4403 Page 19