Lincoln Electric NA-3S, Service Manual, Page: 27 / 110

INSTALLATION
A-20 A-20
NA-3 AND NA-4
FIGURE A.17 – CONNECTION OF NA-3 TO SAF-600 “F” OR SA-800 “F” AND
M.G. SOLID STATE FIELD CONTROL AND K240 CONTACTOR KIT.
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 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. IF USING AN OLDER CONTROL CABLE, CONNECT LEADS #75, #76, AND #77 TO LEADS #75, #76, AND #77 OF THE FIELD CONTROL,
RESPECTIVELY.
N.C. WELDING CABLES MUST BE OF PROPER CAPACITY FOR THE CURRENT AND DUTY CYCLE OF IMMEDIATE AND FUTURE APPLICATIONS.
N.D. 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. (THIS EXTENDED LEAD #21 CONNECTION REPLACES THE NEED TO EMPLOY THE
REMOTE WORK LEAD ACCESSORY ON LN-8 METER KITS THAT HAVE A DIRECT WORK LEAD JACK.)
N.E. CONNECT TO DESIRED ELECTRODE TERMINAL.
49
24
48
30
68 OR 73
21
69
1
70 OR 74
WORK
TERM.
C4
F4
22
2
31
67
32
SAF-600 OR SA-800
"-F" CONTROL BOX
OPTIONAL
SOLID STATE
FIELD CONTROL
FIELD CONTROL
INPUT CABLE
ELECTRODE CABLE TO
SEMIAUTOMATIC OR AUTOMATIC
SHUNT.
TO WORK
TO AUTO
EQUIP.
TO POWER
SOURCE
4 24 1 2 31 32 75 76 77
2 4 31 32
21
2
31
32
GND
A
B
C
4
TO SEMIAUTOMATIC OR
AUTOMATIC CONTROL BOX
N.B.
CONTROL
CABLE
K240 CONTACTOR KIT 115V 60 HZ.
TO RECONNECT FOR 50 HZ SEE
INSTRUCTIONS ON INSIDE COVER
(NOTE: 600 AMP CAPACITY)
N.C.
N.C.
N.A.
AND
N.D.
N.C.
N.E.