3com PSE2500-A3 Benutzerhandbuch

User Manual 
PSE2500-A3 External PoE
Power System 

Chapter 2  System Description

 

2-4 

rectifier failure, rectifier self-protection, the red LED is on. Once the 

alarm is gone, the red LED goes off. 

The controller of the PSE2500-A3 has two major functions: 

Inside PSE2500-A3 there is an AC sensor card, which can 

sample the AC input voltage. The sampled signal is sent into the 

controller for data processing. Once the input voltage is lower than the 

pre-set alarm level of the input low voltage, the controller reports an 

AC input under-voltage alarm. Likewise, if the input voltage is higher 

than the pre-set alarm level of the input high voltage, the controller 

reports an AC input over-voltage alarm. 

The sampled DC output voltage signal is also sent into the 

controller. Once the output voltage is lower than the pre-set alarm 

level of the output low voltage, the controller will reports a DC   Low 

alarm. Likewise, if the output voltage is higher than the pre-set alarm 

level of the output high voltage, the controller reports a DC output high 

alarm.  

The rectifier communicates with the controller through RS485 

bus. The working status of the rectifier is passed to the controller in 

this way. Once the rectifier has an alarm, the information is passed to 

the controller. The rectifier failure alarm includes: AC input failure, DC 

output failure, fan failure, output high, over temperature, and module 

shut-down. 

The controller supports China national standard protocol YD/T 

1104-2001. User can apply this protocol to read system information or