Lincoln Electric SVM151-A service manual Work Connection, Case Grounding

A-4 A-4

INSTALLATION

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WARNING

Be sure to follow the safety practice to use the female connector on the cable which would normally be electrically "hot"

(supply lead) if disconnected when the system is energized, and the male on the

normally “cold” (load lead) side. If practical, shut off power before connecting or disconnecting terminals.

Connect the Multi-Weld grounding lead to the work piece separately from the Work clip. If the same clip is used for both ground and work connection, the Multi- Weld case will be electrically “hot” to the work if the clip is removed without first switching OFF the panel switch. ( Refer to the Work clip WARNING).

INTER-CONNECTION OF

CONVERTERS

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WORK CONNECTION

Each Converter in the Multi-Weld system must have its individual “Work” lead connected (clipped) to the work. The #3 AWG (27 mm2) Work clip lead must have clean metal connection to the work to complete the DC input supply and output power circuits of the Multi-Weld 350.

WARNING

Do not disconnect the Work clip lead without first switching OFF the Converter panel switch. Failure to do so will allow the Work lead clip to be electrically “hot” to work and “hot” to the electrode, through the circuit of the Converter, for about 5 seconds until the input con- tactor opens.

CASE GROUNDING

As shipped, the case of the Multi-Weld 350 is isolated from all of the DC input and output welding terminals. It is equipped with a grounding terminal screw

(.31” / 7.9 mm) marked with the symbol located on the bottom rear of the base assembly. (Refer to the bot- tom view figure.) In order to comply with CSA and UL case grounding specifications, this terminal is provided for connection to weldment work that must be properly grounded per methods meeting local and national elec- trical codes. Refer to “Safety in Welding, Cutting and Allied Processes,” ANSI Z49.1 (US) and W117.2 (Canada).

Since any case fault would only involve the DC welding circuit, the size of the grounding lead should have the capacity to ground the potential fault current without burning open. Use at least #6 AWG (13 mm2), but need not exceed the size of the input cable supplying the Multi-Weld 350.

The input and electrode cables of the Multi-Weld 350 Converters may be inter-connected in a Multi-Weld system using any combination of Distribution Box(es) (see Figure B.1), paralleling (CC mode only) and “daisy-chaining” (see Figure A.2). Choose the config- uration that best fits the field application setup within the capacity of the power source supplying the system.

Power Source (Volts x Amp) capacity > 1.1 x

Sum of Converters’ (Volts x Amps) arcs

WARNING

Paralelled units may be powered from more than one source. Disconnect all inputs, including outputs from other sources, before working on the equipment. Before removing the parallel jumper, be sure both Converters are switched OFF. If not, the male side of the first disconnection will be electrically “hot” to work.

MULTI-WELD 350