Alpha Technologies CXPS 48-1.2-225 48 Vdc - Manual (Page 18)

053-691-B1 Rev E Page 10 of 33
2.4 Rectifiers
The rectifier modules employ an advanced resonant power conversion technology with high power conversion
efficiency. All internal semiconductor devices operate under “soft-switching” conditions and exhibit very low power
loss. The reduced power loss leads to lower thermal stresses on the semiconductors and thus improves reliability.
Sustaining low component temperatures is the primary factor with meeting three worst-case field scenarios: 65ºC
ambient temperatures, full output power, and low AC input (176 Vac). While meeting these specifications, Cordex
rectifiers are roughly twice as reliability at 55ºC ambient temperature and up to four times more at 45ºC.
2.5 Rectifier front panel
Figure 7–Rectifier front panel
2.5.1 LEDs
Three front panel LEDs are used to show the rectifier status and to help locate a specific rectifier module that is
under the control of the controller.
AC
The top green LED illuminates continuously when the AC input power is within the acceptable range and the
rectifier is delivering power to the load. It flashes when the AC input power is outside the acceptable range.
This happens when the AC Mains Low or AC Mains High alarms are activated. This LED light is off when
there is no AC input power.
DC
The middle green LED illuminates continuously when the rectifier is delivering power to the load. It flashes
when communication is lost. This LED light is off when the rectifier is off, for example when the rectifier is
switched off by the controller.
Alarm
The bottom red LED illuminates continuously during an active Module Fail alarm. It flashes when a minor
alarm is detected. This LED light is off when there are no alarms, no AC input power, or if the rectifier is not
connected to a battery or another parallel rectifier.
Locate Module command
When the Locate Module command has been received by the rectifier from the controller, the LEDs will flash
in a distinct pattern, repeating every 2 seconds.
Firmware upload
When a rectifier firmware upload is in progress, the LED pattern is the same as during the Locate Module
command.
2.5.2 Mechanical connections
A locking clip is used to secure the rectifier into the shelf. The rectifier must be locked into position during normal
operation. A handle or grip is incorporated into the front panel to help remove of the rectifier from the shelf. A 1/8"
x 4 flat head screwdriver is used to lift and release the clip from the locked position.
2.5.3 Rear panel
Connections for the shelf power and communications are located on the rear panel of the rectifier.