Lincoln Electric NA-3 Service Manual page 18

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FIGURE A.8 – CONNECTION OF NA-3 (SET FOR CONSTANT CURRENT WELDING) TO A
SAF-600 OR SA-800, TYPE "-F" AND M.G. SOLID STATE FIELD CONTROL.
SAF-600 OR SA-800
"-F" CONTROL BOX
68 OR 73
70 OR 74
WORK
TERM.
N.B.
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
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. BOLT AND TAPE CONNECTION.
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. IF USING AN OLDER CONTROL CABLE, CONNECT LEADS #75, #76, AND #77 TO LEADS #75, #76, AND #77 OF THE FIELD CONTROL,
RESPECTIVELY.
INSTALLATION
WARNING
TURN OFF INPUT POWER
TO THE WELDING POWER
SOURCE USING THE
DISCONNECT SWITCH
BEFORE WORKING
ELECTRIC
ON THIS EQUIPMENT.
SHOCK
CAN KILL
OPTIONAL
SOLID STATE
FIELD
CONTROL
48
49
4 24
69
C4
22
67
30
24
21
1
F4
2
31
32
32 31
N.A. AND N.C.
CONNECT TO DESIRED
ELECTRODE TERMINAL
N.B.
NA-3 AND NA-4
FIELD CONTROL
INPUT CABLE
1 2 31 32 75 76 77
N.A.
2 21 GND 4 A B C
N.C.
NEAR THE POWER SOURCE TERMINAL STRIP OR TO
R
CLEVELAND, OHIO U.S.A
TO AUTOMATIC
CONTROL CABLE
CONTROL BOX
OR FEEDER
ELECTRODE CABLE TO
AUTOMATIC SHUNT
TO WORK
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