Lincoln Electric IM420-D Diagrams, Connection of DC-1000 with NL Option KIT to LAF-3 Obsolete

F-1 DIAGRAMS F-1

CONNECTION OF DC-1000 WITH NL OPTION KIT TO LAF-3 (Obsolete)

N.C.

POWER SOURCE

4

N.B.

82 21 4 2 31 32 73 74 75 76 77

10

	67	21	4	2	31	32	75	76	77		6
									E		D
N.A.	NEGATIVE						POSITIVE
									F		C
		N.D.								21	1

2

1

10

21

32

31

22

75

76

77

NL OPTION

CONNECT THE RED LEAD TO

TERMINAL 22

75

76

77

						GND
35 VOLT CONTROL
EXCITER
6	4	2	1	10	21 32 31	18	45	29	5

K775 REMOTE CONTROL MOUNTED AT LAF-3

TO LAF-3

CONTROL BOX

M13321

8-2-90F TO WORK

N.A. On all DC-1000 and DC-1500 units with codes above 8234 extend lead 67 and connect it to the electrode cable going to the automatic equip- ment.

N.B. On DC-1500 units below code 8234 this is 67 and the LAF-3 #67 lead can be connected either to the #67 termi- nal or the electrode cable terminal as shown. Terminal 82 not present on later D.C. 1500’s and all DC-1000’s.

N.C. Terminals 73 and 74 not present on earlier DC-1500’s.

ELECTRODE CABLE TO	TAPE UP LEADS
AUTOMATIC EQUIPMENT
	NOT USED

N.D. Alternative 500 amp positive terminal connection provided on DC-1000 models above code 9500 only.

This diagram shows the electrode connect- ed positive. To change polarity, turn power source off, reverse the electrode and work leads at the power source and position the switch on the power source and NL Option Kit to the proper polarity. Also reverse the leads on the back of the ammeter and volt- meter in the LAF-3 control box.

Contactor drop out delay switch on the NL Option Kit must be in the “On” position.

The 4/0 cables shown will handle up to 1000 amps at 80% duty cycle. For higher currents or duty cycle add additional cables to the power source output studs.

For best arc striking when connected to an LAF-3 make the following change inside the LAF-3 control unit. Remove the blue jumper lead connected between #1 on the coil of the main relay and #7 on the coil of the transfer relay. (The main relay is the upper right relay when facing the left end of the control box. The transfer relay is just to the left of the main relay.)

CONNECTION OF DC-1000 TO LN-8

											T O L N - 8 I N P U T
				P O W E R S O U R C E							C A B L E P L U G
										C O N T R O L C A B L E
	2 1	4	2	3 1	3 2	7 3	7 4	7 5	7 6	7 7	G N D
											C	} *
											B
											A
											3 2
											3 1
											2
											4
											2 1
N . B . &
N . C .	N E G A T I V E					P O S I T I V E
			N . D .								E L E C T R O D E C A B L E T O
											W I R E F E E D U N I T
					N . A .						} T O W O R K
S17176
8-2-90F

Connect the control cable ground lead to the frame terminal

marked near the power source terminal strip. The power source must be properly grounded.

*If using an older control cable: Connect lead #75 to #75 on ter- minal strip, connect lead #76 to #76 on terminal strip, connect lead #77 to #77 on 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 or larger insulated wire physi- cally 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 connec- tion. For convenience, this extended #21 lead should be taped to the welding work lead.

N.C. Tape up bolted connection.

N.D. Alternative 500 amp positive terminal connection provided on DC-1000 models above code 9500 only.

Above diagram shows electrode connected positive. To change polarity, turn power source off, reverse the electrode and work leads at the power source and position the switch on power source to proper polarity.

IDEALARC® DC-1000