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TROUBLESHOOTING & REPAIR
F-54 F-54
INVERTEC STT
IGBT MODULE REMOVAL
AND REPLACEMENT (continued)
FIGURE F.23 – OUTPUT CHOKE LEAD DISCONNECTION
LOWER
TRAY
AREA
OUTPUT CHOKE/
IGBT MODULE
SPLICED CONNECTION
PROCEDURE
1. Turn off the Invertec STT and disconnect main
AC input power to the machine.
2. Using the 5/16" nut driver, remove the case
wraparound cover.
3. Perform the Input Filter Capacitor
Discharge Procedure. See the Maintenance
section.
ELECTRIC SHOCK can kill.
• Before continuing with the
test procedure, perform
the capacitor discharge
procedure to avoid electric
shock.
4. Locate the lead connection splice from the
output choke to the IGBT module. Remove
the insulating sleeve. Using the 7/16" wrench
disconnect the lead splice. Thread the lower
lead down into the lower tray assembly area.
See Figure F.23.
WARNING