Lincoln Electric IM697 RED-D-ARC MX 300 - Manual (Page 20)

D-2 MAINTENANCE D-2
SERVICE
The RED-D-ARC MX350 was designed for easy ser-
vice using quick to replace components, and assem-
bly modules which could be simply swapped out at the
job site to minimize down time, and so more pro-
longed troubleshooting and repair of the module may
be done later on the service bench.
2
4
1
3
Figure 5
The above, Figure 5, shows the three assembly mod-
ules 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" Control and Peripheral PCBʼs.
• Front panel with "plug-n-play" instruments which
individually 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.
This module assembly includes:
• Heatsinked power switching (IGBT) boards and
isolated diodes.
• Capacitors and potted power supply boards.
• Fan and sheetmetal bulkhead tunnel and compo-
nent enclosure.
• Harness lead receptacles and power leads that
connect to Base Module.
Base Module (item (3) is the mounting and connec-
tion platform for the other modules.
This module assembly includes:
• Base sheetmetal with input / output connection
chambers 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.
RED-D-ARC MX350
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.