R&D – SERVICE MANUAL DT0488
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CS 0153 AUXILIARY DC/DC CONVERTER BOARD
Fig.
15
This board receives power from three different redundant sources :
800Vdc Voltage coming from DC bus ,
400V ac Voltage coming from Reserve ac input
400V ac Voltage coming from Mains ac input
These voltages, rectified are applied to a flyback dc/dc insulated converter that gives
regulated dc voltages on the output to all the boards of the UPS
Each line coming in are protected with resistor on the board.
Name Description
Value Note
R57-R58
Positive and Negative DC input
47 ohm
Fig.15
R50-R51-R52
Input Mains AC L1-L2-L3 input
47 ohm
Fig.15
R53-R54-R55
Reserve Input AC L1-L2-L3 input
47 ohm
Fig.15
LED D23
R57-R58
R50-R51-R52
R53-R54-R55