Unscheduled Repair; General; Service Information And Factory Repair - Hobart 6T28-600CL Operation And Maintenance Manual

OM-2244 / Operation and Maintenance Manual
DCS-600/ Series 500082 / Solid State Transformer-Rectifiers
Chapter 3 Overhaul / Major Repair / Inspection

Unscheduled Repair

1) General

Repair of the GPU will consist primarily of parts replacement. Most of the components used in the GPU
cannot be disassembled and repaired, and must be replaced if faulty. Additionally, inoperative PC boards
cannot be repaired in the field, but must be replaced as a complete unit. PC boards may be returned to
the factory for replacement. Contact ITW GSE for parts and replacement instructions.

2) Service Information and Factory Repair

The ITW GSE Service Department can answer questions concerning the operation, repair, or servicing of
this GPU. When making such an inquiry, be sure to provide the model number, serial number, and
approximate date of receipt of the unit. If it is deemed necessary to return the unit to the factory for
servicing, contact the Service Department for authorization. It is rarely necessary to return a failed GPU
since the unit uses plug-in type assemblies throughout its systems. For warranty information, refer to the
warranty statement at the front of this manual or contact the ITW GSE Service Department.
When ordering parts from your ITW GSE Distributor, be sure to include all pertinent information from the
unit's identification plate: Specification No., Model No., and unit rating.
3) GPU Removal and Replacement
If extensive repairs are to be made on the GPU, you may wish to move it to a more convenient location.
WARNING
High voltages may be present inside the cabinet, even when the unit is off. Exercise
extreme caution or FATAL SHOCK may result.
a) Turn off the input power at the source. Make sure that the power cannot be inadvertently turned back
on.
b) Remove the top cover.
c) Disconnect the three AC input leads at the terminals on the input contactor and the grounding wire at
the grounding lug.
d) Loosen the cable clamp on the rear of the GPU and remove the input cable from the clamp.
e) Disconnect the output cable from the output contactor (+) and the ammeter shunt (-).
December 15, 2014 Chapter 3-1
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