After replacing all defective components on the power stage (PSDR), proceed
to make the connection on the control board. Supply the DC voltage 36V
dc/2Amp (limited current) with the DC power supply via P6+ and P8-.
Turn on the switch on the panel. After doing that, the message Current limit
will be displayed on the DC power supply for about 2 seconds. If not, there
might still be some defective components that have not been found. When
everything seems to be working, turn off the switch on the panel and remove
the DC power supply. Plug in the power cord and supply the UPS with the
mains. Test the output of the charger (P5+,P6- ). If it is 41.2Vdc, the fan will
also start working. If there are no issues with the charger, connect the batteries
via P6, P8.
Finally, turn on the switch on the panel again and follow the procedure listed in
part III (Alignment) to adjust the DC offset, and measure the output voltage on
the DC bus.
CAUTION: DO NOT
supply the UPS with the mains until all defective
components have been replaced.
