The METER POLARITY switch is located above
the output connectors. The switch provides a work
connection for wire feeder voltmeters. Place the
switch in the position of the electrode polarity indi-
cated by the decal. The switch does not change
the welding polarity.

11.

6-pin MS-style connector for remote control.

12.

14-pin MS-style connector for wire feeder connec-
tion and remote control.

REMOTE CONTROL of the OUTPUT CONTROL and
WELD TERMINALS

The Invertec V350-Pro has auto sensing of remote out-
put controls. If after connecting or removing a remote,
the Invertec V350-Pro did not configure the way you
would like the local or remote control settings can be
changed by pushing the OUTPUT CONTROL or
WELD TERMINAL button. (A user cannot select
between the 6 and 14 pin MS-style connectors.)

CV modes

• The remote will default to the 14-pin MS-style con-

nector if a remote is connected. If no remote is con-
nected to the 14-pin MS-style connector then the
remote will default to the 6-pin MS-style connector if
a remote is connected to it.

• In all of the CV modes, the WELD TERMINAL con-

trol will default to REMOTE.

TIG mode

• The remote will default to the 6-pin MS-style if a

remote control is connected to the 6-pin MS-style
and to the 14-pin MS-style connector. If a remote is
not connected to the 6-pin MS-style connector then
the remote will default to the 14-pin MS-style con-
nector if a remote is connected.

• If a remote control is connected to any of the MS-

style connectors the WELD TERMINAL control will
default to REMOTE. If there are not any remote con-
trol devices attached the WELD TERMINAL control
will default to ON.

CC-Stick modes

• The remote will default to only the 6-pin MS-style

connector if a remote is connected to it.

• The WELD TERMINAL control will default to ON with

or without a remote connected.

Types of Remote OUTPUT CONTROL

• The Invertec V350-Pro’s Output Control can be con-

trolled by either a potentiometer connected between
77 & 75 with the wiper connected to 76 or a 0V to
10V DC supply connected between 76 & 75. (76
needs to be positive)

• 14-Pin Ms-style connector lead 75 is pin G, lead 76

is pin F and lead 77 is pin E.

• 6-Pin Ms-style connector lead 75 is pin C, lead 76 is

pin B and lead 77 is pin A.

Potentiometer Control

• The total resistance should be between 2000 ohms

(2K) and 10,000 ohms (10K)

• The machine output will be at minimum when lead

76 (wiper) is at the end of the potentiometer that is
connected to 75. The machine’s output will increase
as the wiper of the potentiometer is moved to the end
that is connected to 77. (Note: In TIG mode, moving
the lead 76 (wiper) to lead 77 would produce the cur-
rent that has been set by the Invertec V350-Pro’s
front panel Output Control.)

• Remotes of this type offered by Lincoln Electric are

the K857, K812 and K870.

Voltage Control

• The supply must be an isolated supply. (Not refer-

enced to earth ground, any auxiliary power from the
Invertec V350-Pro or the welding output) The supply
should be capable of supplying at least 20mA.

• 0 volts supplied to 76 will set the Invertec V350-Pro

to minimum output for the mode that has been
selected while 10 volts supplied to 76 will set the
Invertec V350-Pro to the maximum output for the
mode. (Note: In TIG mode, 10 volts supplied to lead
76 would produce the current that has been set by
the Invertec V350-Pro’s front panel Output Control.)

Types of Remote WELD TERMINAL Control

• The Invertec V350-Pro’s Weld Terminals can be con-

trolled from each of the MS-style connectors. The
circuit has a nominal OCV of 15VDC and requires a
dry contact closure (less than 100 ohms) to activate
the output of the Invertec V350-Pro.

• 14-Pin MS-style connector, the Weld Terminals are

controlled from pin C (lead 2) and pin D (lead 4). Pin
C is positive.

• 6-Pin MS-style connector, the Weld Terminals are

controlled from pin D (lead 2) and pin E (lead 4). In
the 6-pin MS-style connector pin D is positive.

OPERATION

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