Lincoln Electric SVM151-A service manual Service, Figure D.2 Major Component Locations

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MAINTENANCE

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SERVICE

The Multi-Weld 350 was designed for easy service using quick-to-replace components and assembly modules that can be simply swapped out at the job site to minimize down time. More prolonged troubleshoot- ing and repair of the module may be done later on the service bench.

Figure D.2 shows the three assembly modules of the Converter which are covered with the Case Wraparound (item (4):

Control Module (item (1) is removed from the Base Module assembly by removing the two bottom accessed screws and disconnecting the three sealed harness plugs from the receptacles on the back of the Control box.

This module is a sealed enclosure containing replace- able electronic components:

•Sealed back cover which mounts the internal “pot- ted” Weld Control and Peripheral PCBs.

•Front panel with “plug-n-play” instruments that indi- vidually plug to the Control PCB.

•Interchangeable “potted” digital meters with front replaceable spatter shield lenses.

•Harness lead receptacles that connect to Base Module harness lead plugs.

Tunnel Module (item (2) is removed from the Base Module assembly by removing the four bottom accessed screws and disconnecting the two sealed harness plugs and power leads.

NOTE: Removal of Control Module improves access to disconnect Tunnel Module power leads.

This module assembly includes:

•Heatsinked power switching (IGBT) boards and iso- lated diodes.

•Capacitors and potted power supply boards.

•Fan and sheetmetal bulkhead tunnel and component enclosure.

•Harness lead receptacles and power leads that con- nect to Base Module.

Base Module (item (3) is the mounting and connection platform for the other modules.

This module assembly includes:

•Base sheetmetal with input/output connection cham- bers with "pigtail" leads.

•Input contactor, input diodes heat sink assembly and Work clip lead.

•Output chokes and current shunt.

•Lead harness sealed plugs connect to Tunnel and Control Module receptacles.

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FIGURE D.2 – MAJOR COMPONENT LOCATIONS

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1.CONTROL MODULE

2.TUNNEL MODULE

3.BASE MODULE

4.CASE WRAPAROUND

2

1

3

MULTI-WELD 350