Lincoln Electric DC-650 PRO, Operator'S Manual, Page: 18 / 34

Set the control panel switches as follows:
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Mode:
GMAW
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Output
Local or Remote (See “ Output Control
Control: Switch ” )
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LN-9/NA-5:
Off
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Wire Feeder Has no effect when arc gouging.
Voltmeter:
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Output
Terminals:
On
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If using Local output control, preset the desired voltage
(approximately 40 volts) using the Output potentiometer and
the volt meter. If using Remote output control, preset the
voltage using a remote control. Begin gouging, and then
adjust the output up or down as necessary.
Installation with an NA-3
As supplied from the factory, the cold inch feature in
the NA-3 will not work when used with a DC-650 PRO
in negative polarity operation. Contact the factory for
information regarding an NA-3 modification procedure
that will allow the cold inch feature to work with the
DC-650 PRO under these conditions.
PROTECTIVE CIRCUITRY
Thermostatic Protection
The DC-650 PRO has a thermostat in both the
primary and secondary circuits.
The primary thermostat, located inside the right
primary coil, will open up if the main transformer
overheats. The machine will completely shut off when
the primary thermostat opens. The machine must be
allowed to cool before it can be restarted.
The secondary thermostat, located on the secondary
common lead at the front of the main transformer, will
open if the output is overloaded, the duty cycle is
exceeded, or if the flow of cooling air is blocked.
When the secondary thermostat opens, power will be
removed from control transformer T3, causing the
Control PC Board to lose power. The meter displays
will go off, and there will be no output from the DC-
650 PRO. The pilot light will remain lit, and the fan
will continue to run. When the machine cools down,
the thermostat will close automatically, and normal
operation will be restored.
terminal strip. (See Figure 4). Instead, extend the
wire feeder control cable 21 lead to the workpiece.
Insulate the 21 lead connection with tape or other
means to achieve 300V withstand capability.
The LN-9 or NA-5 will now sense arc voltage through
this work sense lead. The DC-650 PRO meters will
continue to read the output stud voltage, so there may
be a difference between the DC-650 PRO voltmeter
and the wire feeder voltmeter.
When using the terminal strip for wire feeder
connection, extend the 21 lead to the workpiece as
follows:
1. Turn the input power Off.
2. Open the terminal strip door. When installing the
wire feeder, do not connect the lead marked 21
coming from the wire feeder control cable to the
terminal strip. (See Figure 4). Instead, extend the
wire feeder control cable 21 lead to the workpiece.
Insulate the 21 lead connection with tape or other
means to achieve 300V withstand capability.
The LN-9 or NA-5 will now sense arc voltage through
this work sense lead. The DC-650 PRO meters will
continue to read the output stud voltage, so there may
be a difference between the DC-650 PRO voltmeter
and the wire feeder voltmeter.
K317 DUAL PROCESS KIT (FOR WIRE
FEEDERS USING SAME POLARITY
This kit permits the connection of two wire feeders to
the DC650 PRO. Both feeders will weld with the same
electrode polarity. When the trigger of the desired wire
feeder is pressed, the DC650 PRO output control
leads (75, 76, and 77) will be connected to that feeder
and the procedure as set on its controls will be
provided. The other connected wire feeder will not be
feeding wire but is electrically hot. The kit mounts at
the power source and is connected to the power
source terminal strip with the supplied leads.
Installation instructions are included with the kit.
NOTE: When using the DC650 PRO power source the
K317 Dual Process Kit can only be used with two like
wire feeders. An LN-9 cannot be used with an LN-8.
Only two LN-9
’ s may be used together or two LN-8 ’ s
together.
AC-A (Arc Gouging) Operation
Most arc gouging is done with constant voltage
output. Connect the electrode lead to the
“ + ” output
studs, and the work lead to the “ - ” studs labeled
“ GMAW, FCAW ” . Do not make any connections to
the left hand pair of output studs.
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18
– Dec 95