OM-252 624 Page 41
6-2. Description Of Front Panel Controls (See Section 6-1)
Engine Starting Controls
1
Preheat Switch
Use switch to energize starting aid for cold
weather starting (see starting instructions fol-
lowing).
2
Engine Control Switch
Use switch to start engine, select engine
speed, and stop engine.
In Run position, engine runs at weld/power
speed. In Run/Idle position, engine runs at
idle speed at no load and weld speed with load
applied.
NOTICE
−
Diesel engines in MILLER equip-
ment are meant to operate optimally at rated
load. Using light or intermittent loads may
cause wetstacking.
To Start
:
NOTICE
−
Do not use ether.
If engine does not start, let engine come
to a complete stop before attempting re-
start.
Above 32
5
F (0
5
C):
turn Engine Control
switch to Start. Release Engine Control
switch when engine starts.
Below 32
5
F (0
5
C):
turn engine control switch
to Run position. Push Preheat switch up for
15 to 30 seconds. Turn Engine Control switch
to Start. Release Engine Control switch and
Preheat switch when engine starts.
Do not operate Preheat switch for more
than 60 seconds at a time.
To Stop
: turn Engine Control switch to Off
position.
Engine Gauges, Meters, And Lights
3
Engine Coolant Temperature Gauge
Normal temperature is 200 - 230
°
F (93 - 110
°
C). Engine stops if temperature exceeds 266
°
F (130
°
C).
4
Engine Oil Pressure Gauge
Normal pressure is 30
−
60 psi (206
−
414
kPa). Engine stops if pressure is below 22 psi
(150 kPa).
See Section 6-8 for complete fuel/hour
gauge information.
5
Fuel/Hour Gauge
Use gauge to check fuel level, total engine op-
erating hours, or hours to oil change.
To check fuel level or engine hours when en-
gine is not running, turn Engine Control switch
to Run/Idle position.
6
Engine Indicator Light
Light goes on and engine stops if fuel is low,
engine temperature exceeds 266
°
F (130
°
C) or engine oil pressure is below 22 psi (150
kPa).
Normal engine temperature is 200 - 230
F (93 - 110
C). Normal oil pressure is 30
- 60 psi (207 - 414 kPa).
NOTICE
−
Do not run engine until trouble is
fixed.
Weld Meters
Weld meters also work in combination to
display troubleshooting help codes (see
Section 8-8).
7
DC Ammeter
Ammeter displays preset amperage (Stick
and TIG only) when not welding, and actual
output amperage when welding.
To set amperage, turn Process/Contactor
switch to Stick or TIG position. Turn V/A con-
trol until desired amperage is displayed on
Ammeter. When welding is finished, ammeter
displays weld amperage and then defaults to
preset amperage.
8
DC Voltmeter
Voltmeter displays preset voltage (MIG weld-
ing) with contactor off, and actual output volt-
age with the contactor on. Voltmeter displays
voltage at the weld output terminals, but not
necessarily the welding arc due to resistance
of cable and connections.
To set voltage, turn Process/Contactor switch
to MIG or FCAW position. Turn V/A control
until desired voltage is displayed on Voltme-
ter. When welding is finished, voltmeter dis-
plays weld voltage and then defaults to preset
voltage.
Weld Controls
9
Voltage/Amperage Control
With Process/Contactor switch in any Stick or
TIG setting, use control to adjust amperage.
With Process/Contactor switch in any Wire
(MIG or FCAW) position, use control to adjust
voltage. Control limits the remote amperage
in Stick or TIG mode, but has no effect in Wire
modes.
10 Process/Contactor Switch
See Section 6-3 for Process/Contactor
switch information.
11 Remote Control Receptacle
Use receptacle to connect remote controls,
wire feeders, and tools requiring 24 VAC.
When a remote control is connected to the
Remote receptacle, the Auto Sense Remote
feature automatically switches voltage/am-
perage control to the remote control (see Sec-
tion 6-6).
With remote control connected, weld output is
determined by a combination of front panel
and remote control voltage/amperage set-
tings.
If no remote control is connected to the Re-
mote receptacle, the front panel Voltage/Am-
perage control adjusts voltage and amper-
age.
If a remote device connected to Remote
Receptacle is faulty or is disconnected
during operation, the meters display Help
25 (see Section 8-8). Clear fault by stop-
ping and restarting the unit or by turning
Process/Contactor switch to another
position.
12 Arc Control
See Section 6-4 for Arc Control information.
13 Optional Welder Selector Switch
Use switch to select Dual Operator or Single
Operator welding mode.
Place switch in Welder A/Welder B (dual op-
erator) position for CC and CV output from
Welder A (left) and Welder B (right) weld out-
put terminals. Control the weld output from the
terminals on each side using the weld con-
trols on that same side.
Place switch in Welder A (single operator)
position for weld output from Welder A (left)
weld output terminals only.
Welder B (right) weld output terminals are
disabled in Single Operator mode. Con-
nect only to Welder A (left) terminals for
Single Operator operation.
