Operation, Ln-25 instruments and controls – Lincoln Electric IM677 RED-D-ARC LN-25 User Manual

Page 13

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LN-25

B-2

B-2

OPERATION

VOLTMETER

(Factory installed on model Codes above 9218)

The 40V DC analog voltmeter is mounted to the front
control panel of the LN-25 and is connected to read
the arc voltage between the LN-25 electrode cable
connection and the work clip lead.

NOTE:

1. The Voltmeter will read zero if the LN-25 work clip

lead is not connected to work, even if the elec-
trode is electrically “hot” to work.

2. The Voltmeter will read below zero if the LN-25

polarity switch is not set to the same polarity as
the electrode.

3. The Voltmeter will read power source open circuit

voltage when the gun trigger is open, even if the
LN-25 is equipped with the internal contactor.

“ELECTRODE POLARITY” SWITCH

The polarity switch is located on the front panel of the
LN-25 case.

Set the switch to the same polarity as the electrode
lead connection to the power source. If the switch is
not set for the correct polarity, the wire feeder will not
operate.

WIRE FEED MODE SWITCH

The CV-VV (CC) Wire Feed Mode switch is located
inside the LN-25 case. The toggle switch extends from
beneath the control box just above the wire drive.

The forward “CV” position provides constant wire feed
speed mode for use with constant voltage (CV)
welding power sources.

The backward “VV (CC)” position provides arc-sensing
wire feed speed mode for use with constant current
(formerly variable voltage) welding power sources.

WIRE SPEED DIAL AND RANGE SWITCH

The Wire Speed control dial on the front panel of the
LN-25 has two calibrated dial ranges selected by the
HI-LO Dial Range switch.

When switched to the LO range position, the constant
wire feed speed (CV Wire Feed Mode) is set on the
inside (white) dial range calibrated for 50 to 350
in/min.

When switched to the HI range position, the constant
wire feed speed (CV Wire Feed Mode) is set on the
outside (black) dial range calibrated for 50 to
700 in/min.

The volts marks around the HI range calibrated dial
indicate the minimum arc volts required to obtain the
indicated HI range wire feed speeds. For example; if
wire speed is set to 400 in/min., a welding procedure
arc voltage of at least 17V would be required to obtain
the 400 in/min. wire feed speed.

LN-25 INSTRUMENTS AND
CONTROLS

Refer to Figure B.1 for control locations.

REMOTE

ARC VOLTAGE

CONTROL

(OPTIONAL)

WIRE SPEED

DIAL RANGE

SWITCH

WIRE

SPEED

DIAL

VOLT

METER

WORK CLIP

LEAD

GUN

CONNECTION

BLOCK

GUN

TRIGGER

AMPHENOL

CONNECTOR

GAS

FITTING

(OPTIONAL)

ELECTRODE

POLARITY

SWITCH

GAS POST/

PRE FLOW

TIMERS

(OPTIONAL)

ELECTRODE
CABLE

OPTIONAL

GAS INPUT

FITTING

GAS PURGE
BUTTON

FIGURE B.1 CONTROL LOCATIONS

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