Lincoln Electric NA-3S, Service Manual, Page: 21 / 110

INSTALLATION
A-14 A-14
NA-3 AND NA-4
FIGURE A.11 – CONNECTION OF NA-3 TO R3S-400, 600, OR 800
WITH LINE VOLTAGE COMPENSATOR.
CLEVELAND, OHIO U.S.A
ELECTRIC
SHOCK
CAN KILL
TURN OFF INPUT POWER
TO THE WELDING POWER
SOURCE USING THE
DISCONNECT SWITCH
BEFORE WORKING
ON THIS EQUIPMENT. WARNING
R
2 4 21
POWER SOURCE
TO WORK
ELECTRODE CABLE TO
AUTOMATIC SHUNT
NEGATIVE
31 32
21
2
31
32
GND
A
B
C
4
75
76 77
TO R35 LINE VOLTAGE
COMPENSATOR
TO AUTOMATIC
CONTROL BOX
CONTROL CABLE
N.D.
N.B.
N.C.
N.B.
N.A.
THE ABOVE DIAGRAM SHOWS THE ELECTRODE CONNECTED POSITIVE. TO CHANGE POLARITY, TURN OFF THE POWER, REVERSE THE
ELECTRODE AND "TO WORK" LEADS AT THE POWER SOURCE, AND REVERSE THE "CONTROL SWITCH" AT THE POWER SOURCE.
CONNECT THE CONTROL CABLE GROUND LEAD TO THE FRAME TERMINAL MARKED NEAR THE POWER SOURCE TERMINAL STRIP OR TO
AN UNPAINTED FRAME SCREW. THE POWER SOURCE MUST BE PROPERLY GROUNDED.
N.A. ON EARLIER R3S-400, 600, AND -800 MACHINES, TERMINALS #67 AND #1 WERE ALSO ON THE TERMINAL STRIP.
N.B. WELDING CABLES MUST BE OF PROPER CAPACITY FOR THE CURRENT AND DUTY CYCLE OF IMMEDIATE AND FUTURE APPLICATIONS.
N.C. EXTEND LEAD #21 USING #14 AWG OR LARGER INSULATED WIRE PHYSICALLY SUITABLE FOR THE INSTALLATION. AN S16586-[ ]
REMOTE VOLTAGE SENSING WORK LEAD IS AVAILABLE FOR THIS PURPOSE. CONNECT IT DIRECTLY TO THE WORK PIECE, KEEPING IT
ELECTRICALLY SEPARATE FROM THE WELDING WORK LEAD CIRCUIT AND CONNECTION. FOR CONVENIENCE, THIS EXTENDED LEAD
#21 SHOULD BE TAPED TO THE WELDING WORK LEAD.
N.D. NA-3 LEADS A, B, AND C (#75, #76, AND #77 ON OLDER K215 CONTROL CABLE) ARE TAPED UP WHEN THE R3S LINE VOLTAGE
COMPENSATOR IS CONNECTED. ARC VOLTAGE IS CONTROLLED BY THE LINE VOLTAGE COMPENSATOR RHEOSTAT. THERE WILL BE NO
ADJUSTMENTS OF VOLTAGE BY AUTOMATIC CONTROL BOX CONTROLS.
N.E. IF A VARIABLE VOLTAGE (V.V.) BOARD IS PRESENT IN THE AUTOMATIC CONTROLS, THE JUMPER LEAD ON THE V.V. BOARD MUST BE
CONNECTED TO PIN "L."