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Replacing of damaged transistors
In order to replace damaged transistor following items have to be disassembled:
S diode rectifiers
S output terminal
S DC--link terminals unconnected from modules
Important note -- IGBT module is symmetrical except two plastic pins for positioning PCB.
During replacement check if ”+” ”--” marked side of module is placed on capacitors side and
ant the end is connected to DC--link terminals.
Before placing new module its base plate has to be covered by thin layer of thermal
conducing silicon paste.
Fixing torques:
S module to heatsink, screw M5x18 T=3--5Nm
S terminal, screw M6x16 T=3--5Nm
NOTE: Always replace all modules.
High current aluminum leads maintenance
NOTE: In case of disconnecting the high current aluminum leads of main transformer or
rectifier bridge, the service technician must perform following actions prior to re--connecting:
S mechanically remove the oxides from the contact surfaces
S cover the contact surfaces with thin layer of electro--conducting paste EL/5--846
(140g tube -- Ordering No.: 0349 312 885)
S re--connect the lead and tighten with torque of 10Nm
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