Lincoln Electric NA-3 Service Manual page 28

A-21
FIGURE A.18 – CONNECTION OF NA-3 TO IDEALARC DC-600.
21 4
NEGATIVE
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 POSITION THE SWITCH ON THE POWER SOURCE TO PROPER
POLARITY. REVERSE THE LEADS ON THE BACK OF THE AMMETER AND VOLTMETER IN THE AUTOMATIC CONTROL BOX.
N.A. WELDING CABLES MUST BE OF PROPER CAPACITY FOR THE CURRENT AND DUTY CYCLE OF IMMEDIATE AND FUTURE APPLICATIONS.
N.C. CONNECT THE CONTROL CABLE GROUND LEAD TO THE FRAME TERMINAL MARKED
OR TO AN UNPAINTED FRAME SCREW. THE POWER SOURCE MUST BE PROPERLY GROUNDED.
N.D. FOR DC-600 CODES BELOW 8200, CONNECT A JUMPER FROM "N" TO "S." THERE IS NO NPS TERMINAL STRIP ON CODES ABOVE 8200.
N.E. 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.F. TAPE UP BOLTED CONNECTION.
INSTALLATION
WARNING
TURN OFF INPUT POWER
TO THE WELDING POWER
SOURCE USING THE
DISCONNECT SWITCH
BEFORE WORKING
ELECTRIC
ON THIS EQUIPMENT.
SHOCK
CAN KILL
POWER SOURCE
2 31 32 75 76 77 80
N P S
N.D.
POSITIVE
N.A.
NA-3 AND NA-4
TO AUTOMATIC
81
CONTROL BOX
77
76
75
32
31
2
4
21
GND
N.E. AND N.F.
N.C.
N.A.
NEAR THE POWER SOURCE TERMINAL STRIP
R
CLEVELAND, OHIO U.S.A
A-21
CONTROL
CABLE
ELECTRODE CABLE TO
AUTOMATIC EQUIPMENT
TO WORK