Lincoln Electric NA-3S, Service Manual, Page: 19 / 110

INSTALLATION
A-12 A-12
NA-3 AND NA-4
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
THE ELECTRODE POLARITY SWITCHES ON THE POWER SOURCE AND FIELD CONTROL MUST BE SET FOR THE SAME POLARITY. THE POWER
SOURCE MUST BE OFF WHEN CHANGING THE POLARITY.
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.
IF THE OPTIONAL SOLID STATE MOTOR GENERATOR FIELD CONTROL IS NOT USED, TAPE UP SEPARATELY THE LEADS A, B, AND C FROM
THE CONTROL CABLE. ALSO CONNECT A JUMPER FROM TERMINAL #2 TO TERMINAL #24 ON THE POWER SOURCE TERMINAL STRIP.
N.A. WELDING CABLES MUST BE OF PROPER CAPACITY FOR THE CURRENT AND DUTY CYCLE OF IMMEDIATE AND FUTURE APPLICATIONS.
N.B. 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.C. IF USING AN OLDER CONTROL CABLE, CONNECT LEADS #75, #76, AND #77 TO LEADS #75, #76, AND #77 OF THE FIELD CONTROL,
RESPECTIVELY.
30
4
24
22
21
32
1
29
31
2
OPTIONAL
SOLID STATE
FIELD CONTROL
WORK ELECT
ELECTRODE CABLE TO
AUTOMATIC SHUNT OR FEEDER
BOLT AND TAPE CONNECTIONS
TO WORK
4 24 1 2 75 76 77 32 31
21
2
31
32
GND
A
C
B
4
FIELD CONTROL
INPUT CABLE
TO AUTOMATIC CONTROL
BOX OR FEEDER
CONTROL CABLE
N.C.
N.B.
N.A.
N.A.
FIGURE A.9 – CONNECTION OF NA-3 (ALL) TO AN SAN.