Miller Electric NT 456 CC, Owner'S Manual

Page: 25 / 40

OM-2243 Page 21
SECTION 5 − OPERATION
5-1. Controls
229 450-A
1
6
7 4
8
2
3
5
1 Power Switch
This unit is equipped with a fan motor that
is thermostatically controlled and only
runs when cooling is needed (fan-on-de-
mand). If unit is not equipped with fan-on-
demand, fan motor runs when power is
on.
2 Voltmeter (see Section 5-2)
3 Ammeter (see Section 5-2)
4 Mode Switch
Use Mode switch to determine both process
and output On/Off control. Orange areas
highlight “contactor on” positions.
For air carbon arc cutting (CAC-A) and goug-
ing, place Mode switch in Stick position. For
best results, place Inductance/DIG control in
the maximum position.
5
Panel/Remote Control Switch
For front panel control, place switch in Panel
position, and use the V/A Adjust control to set
amperage or voltage, depending on Mode
switch selection.
For remote control, make connections to Re-
mote 14 receptacle (see Section 4-11), and
place switch in Remote position. In TIG
modes, output available through the remote
control is a percent of the V/A Adjust control
setting. Value selected on V/A Adjust control
is maximum output available through the re-
mote control. In the MIG, Pulsed MIG, and V-
Sense feeder modes, a remote control pro-
vides full range of unit output regardless of
V/A Adjust control setting. A remote control
is not functional in the Stick mode. If connec-
tion to Remote 14 receptacle is removed, and
Panel/Remote control switch remains in Re-
mote position, output is controled with the V/A
Adjust control.
6
V/A (Voltage/Amperage) Adjust Control
With Mode switch in any Stick or TIG position,
use control to adjust amperage from 5 to 500
amps. With Mode switch in a V-Sense Feeder
or MIG position, use control to adjust voltage
from 10 to 38 volts. In a Pulsed MIG mode,
wire feed speed is set with the wire feeder,
and the V/A Adjust control is used to set an
arc power that corresponds to the wire feed
speed (30-780 ipm).
7
Inductance/Dig Control
Control adjusts Dig when Stick mode is se-
lected on mode switch. When set towards
minimum, short-circuit amperage at low arc
voltage is the same as normal welding am-
perage. When set to max, control increases
short-circuit amperage at low arc voltage.
This allows the operator to use a very short
arc length without sticking the electrode. As
control is adjusted, the amount of Dig se-
lected is displayed on the amps meter as a
percentage (0 to 100%) of full range, and
dig
is displayed on the volts meter.
For air carbon arc cutting (CAC-A) and goug-
ing, place Inductance/DIG control in the max-
imum position.
Control adjusts inductance when a MIG or V-
Sense Feeder mode is selected. Inductance
determines the “wetness” of the weld puddle.
As setting is increased towards maximum,
“wetness” (puddle fluidity) increases. As con-
trol is adjusted, the amount of inductance se-
lected is displayed on the amps meter as a
percentage (0 to 100%) of full range, and
ind
is displayed on the volts meter.
This control is not functional when one of the
TIG modes is selected.
Change control setting to best suite
application.
Units without Inductance/Dig control
have Inductance/Dig factory set at 20%.
8 Pulse Program Select Switch
Use control to select one of ten programs,
each with different preset pulsing parame-
ters, including welding wire diameter and
type.