Miller Electric Metro 250D - Manual (Page 25)

21
OM-402
5. Operating the Welding Generator
5.1 Front Panel Controls
Ref. ST-175 918-C
9
Y Heavy loading during first 50 hours
will damage engine. Keep load less
than 225A (weld) or 7 kVA (power) for
first 50 hours.
1 Engine Control Switch
Use switch to operate glow plug (optional −
see table), 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.
.
Use Run position for HF-start TIG
welding, and to maintain weld/power
speed under light auxiliary power loads.
2 Idle Lock Switch
Use switch to lock engine in idle speed dur-
ing start-up (see table).
Y Do not weld or use ac receptacles
with switch in Idle position.
To Start: move Idle Lock switch to Idle
position and Engine Control switch to Start
position. Release Engine Control switch
when engine starts. Do not crank engine if
engine is still turning. Move Idle Lock switch
to Run/Idle position after engine warms.
To Stop: turn Engine Control switch to Stop
position.
3
Engine Hour Meter
4 Fuel Gauge
5 Engine Oil Pressure Light
Engine stops and light goes on if oil pressure
is too low.
6
Polarity Switch (Optional)
Use switch to change polarity of weld output.
7 Arc Force (Dig) Control
Use control to automatically increase
amperage as arc length is decreased, to
assist in arc starts, and reduce the chance of
the electrode freezing in the puddle. Set at
minimum for TIG welding.
8
Amperage Control
9 Voltmeter (Optional)
10 Ammeter (Optional)
11 Amperage Control Switch
Use switch to select front panel or remote
amperage control.
12 Output (Contactor) Control Switch
Use switch to control remote contactor if
connected to remote 14 receptacle RC1.
Y Weld output terminals are energized
when Output (Contactor) Control
switch is On and engine is running.
0 s
10 s
20 s
70 ° F (21 ° C)
32 ° F (0 ° C)
−4
°
F (−20
°
C)
10 1
3
5
4
12
11
7
8
2
Using Glow
Plug
2150
rpm
3700
rpm
2150 rpm
(No Load)
3700 rpm
(Load)
2150
rpm
Using Idle Lock Switch
6