Description Of Front Panel Controls (See Section 6-1); Engine Starting Sequence - Miller Big Blue 800 DUO PRO Owner's Manual

6-2. Description Of Front Panel Controls (See Section 6-1)

Engine Starting Controls
1 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 with no generator power or weld
load, and weld/power speed with load ap-
plied.
NOTICE − Diesel engines in MILLER equip-
ment are meant to operate optimally at mod-
erate to rated load. Using light or no load for
extended periods of time may cause wet-
stacking or engine damage. If unburned fuel
and oil collect in exhaust pipe, see Section 13.
2 Engine Display
See Section 14 for engine display informa-
tion.
Weld Meters
.
Weld meters also work in combination to
display troubleshooting help codes (see
Section 8-9).
3 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.
4 DC Voltmeter
Voltmeter displays preset voltage (MIG weld-

6-3. Engine Starting Sequence

1
Service Reminder
Engine Oil
Compressor Oil
NOTICE − Do not use ether.
.
If engine does not start, let engine
come to a complete stop before at-
tempting restart.
To Start:
1 Wait to Start/Preheating Display
.
Complete Parts List available at www.MillerWelds.com
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
5 Arc Control
See Section 6-5 for Arc Control information.
6 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.
7 Process/Contactor Switch
See Section 6-4 for Process/Contactor
switch information.
8 24 Volts AC Overload Protection
See Section 8-8 for overload protection in-
formation.
9 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
Wait to Start/Preheating
Remaining
0
0
The Wait to Start display appears when the
Engine Control switch is placed in the Run
or Run/Idle position. Glow plugs function
automatically according to ambient tem-
perature. The operator needs to pause at
either switch position while the engine con-
troller goes through the preheat sequence.
feature automatically switches voltage/am-
perage control to the remote control (see Sec-
tion 6-9).
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 8-9). Clear fault by stop-
ping and restarting the unit or by turning
Process/Contactor switch to another
position.
10 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.
Remaining
Service Reminder
Engine Oil 480
495
Compressor Oil
Once this message clears, the engine can
be started.
Turn Engine Control switch to Start. Re-
lease Engine Control switch when engine
starts.
To Stop: turn Engine Control switch to Off
position.
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