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4-3
Cisco AC/DC Power System User Guide, R1.0
May 2006
Chapter 4 System Operation
4.2.2 Basic Controller Functions
Step 3 During this recognition time the controller may report module-related alarms and the red LED on the
rectifier may turn on. These alarms are caused by imbalances related to load sharing of the rectifiers (the
new rectifier’s output voltage is different than the existing rectifiers).
Step 4 The rectifier module will take a few minutes to step up to the correct voltage. At this point the controller
will locate and adjust the rectifier module voltage to the correct output voltage and any alarms will be
extinguished.
Step 5 To shorten the time that is needed to find new modules, the controller can be powered down and then
powered up. This will cause the system to search for new modules faster. This is only recommended as
a solution if it is important to shorten the time required for searching for new modules.
4.2.2.3 Remove Modules
Physically removing a module from the system creates a communication error indicated by the yellow
LED on the controller. The yellow LED will remain on until a rectifier is installed.