Lincoln Electric SVM127-A Machine Grounding, Work Cable Connection, Direct Work Lead Connection

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A-12		A-12
		INSTALLATION
	MACHINE GROUNDING	DIRECT WORK LEAD CONNECTION

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LN-9 wire feeders are grounded to the power source through the input cable. The power source grounding cable must be properly connected to electrical ground. See your power source operating manual for details.

WORK CABLE CONNECTION

Connect a work lead of sufficient size and length between the proper output terminal on the power source and the work. See Table A-1. Be sure the con- nection to the work makes tight metal-to-metal electri- cal contact. Poor work lead connections can activate the grounding lead protector and/or result in poor weld- ing performance.

TABLE A.1 – WORK CABLE SIZES

Current	Copper Work Cable Size, AWG
60% Duty Cycle	Up to 50' length	50'-100' Iength
300 Amps	0	000
400 Amps	00	0000
500 Amps	000	0000
600 Amps	000	Two 000

Lincoln specified procedures give voltage readings taken between the work and the gun cable brass con- nection block of the LN-9. To match these voltage read- ings, the connection diagrams show the #21 lead being extended and connected directly to the work instead of #21 on the power source terminal strip (or Dual Process Kit terminal strip). This extended lead must be connected directly to the work. When using a Dual Process Kit, you must extend the lead individually for each LN-9.

As an alternative, LN-9 models are provided with a quick-connect terminal splice connection in the #21 lead between the input Amphenol connector of the LN-9 and its polarity switch. See the LN-9 wiring dia- gram. This in-line connection consists of a red insulat- ed male and female .250 x .032 terminal pair located in the lead harness. It runs along the right side of the wire feed motor inside the control section of the LN-9N and S models and in the lead harness at the lower left cor- ner of the control box (near the input Amphenol) of the LN-9F models. You may also open this #21 lead and connect your own direct work lead equipped with a

.250 x .032 female quick-connect terminal to the male side of the splice. This direct work lead connection must be tape insulated, strain-relieved, and routed out- side the LN-9 control box to be connected directly to the work.

With either direct work lead connection method, the LN-9 regulates the power source to hold the arc volt- age constant, even with voltage drops in the electrode lead, work lead, or work lead connection. If the direct work lead becomes disconnected from the work, the LN-9 wire feeder will stop welding shortly after the arc is struck. See the topic "Circuit Protection and Automatic Shutdown" in the Operation section of this manual.

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LN-9 Wire Feeder