Circuit Description; Figure 7-2 Pps Block Diagram - Tadiran Telecom Coral FlexiCom 6000 Installation Procedure And Hardware Reference Manual

2
Figure 7-2 PPS Block
Diagram
7-4
Power Supplies

Circuit Description

...................................................................................................
Figure 7-2 presents a block diagram of the PPS power supply.
Three separate, switch-mode, DC to DC converters convert the 48VDC input power
to the following outputs: +5VDC, +12VDC, –5VDC, –12VDC.
(One DC-DC converter provides both the –5VDC and –12VDC outputs.)
Filtering circuitry minimizes ripple and noise on the –48VDC feed to the peripheral
cards. The filtering circuitry typically produces an output voltage about 1.5 volts
lower than the input to the PPS.
Monitoring circuitry verifies that each voltage output is within tolerance. Should any
voltage fall out of tolerance, the monitoring circuitry produces an alarm signal to the
system processor, and shuts the PPS down. The green power indicator of a PPS in shut
down condition is still illuminated.
Following a shutdown, and when there is no clear reason for the voltage to drop out
of tolerance, the power ON/OFF switch must be turned to OFF and then to ON in order
to return the power supply to working order.
Turn on the PPS and RPS units only after powering the Main Control Shelf and verifying
that the Main Control Shelf has initialized properly, otherwise the cards in the peripheral
shelves/cages may not initialize.
POWER
SWITCH
-48V IN
48V RTN IN
+5V
F1
DC-DC
8A
CONVERTER
+12V
DC-DC
CONVERTER
-5V REG.
POWER ON
L.E.D.
-5V & -12V
DC-DC
CONVERTER
-12V REG.
-48V
F2 FILTER
15A
Coral FlexiCom 6000 Installation Manual
+5V
T.P.
DGND
+12V
T.P.
DGND
-5V
T.P.
AGND
-12V
T.P.
DGND
-48V
T.P.
48V RTN