User Manual

50289-BDA
USE OR DISCLOSURE OF DATA CONTAINED ON THIS PAGE IS SUBJECT TO THE
RESTRICTION ON THE TITLE PAGE OF THIS MANUAL
38
DC POWER DISTRIBUTION/BATTERY BACKUP:
The DC power requirements of the channel modules and their associated RF power
amplifiers are distributed among multiple power ‘banks’ (VCC1, VCC2, and VCC3).
Dividing the power requirements among multiple power supplies prevents a complete
shut down due to ‘a’ power supply failure. In addition, it allows for an effective switch
over to battery operations. (Refer to Figure 20):
The BA is configured with up to 3 power supplies. The power distribution panel unit,
PDU, consists of 7 relays to switch between the internal power supplies and external
batteries during an interruption of the AC source. For redundancy, for each required VCC
voltage, two relays are wired in parallel. . The external batteries are wired into the BA’s
battery status panel through 2 pins of a 4 pin connector located on the top of the
enclosure (battery input). On the battery status panel, 3 circuit breakers split the battery
service for each VCC voltage required. The power supplies and battery bank switches
(circuit breaker) are paired as follows:
PS1 with battery switch ‘Bank 1’ to supply VCC1.
PS2 with battery switch ‘Bank 2’ to supply VCC3.
PS3 with battery switch ‘Bank 3” to supply VCC2.
To minimize the interruption of the BA operations during switch over to batteries, the 8
channel’s micro-controllers and synthesizers are on a UPS. The UPS voltage source is
supplied by diode ‘OR’ing the DC supplies and the bank switch 3 (external batteries)
across the 7
th
relay of the PDU.
NOTE: TURN OFF THE BA, FIRST TURN OFF THE 3 BATTERY BREAKERS
(PULLED OUT). This prevents the switch over to battery back during shut down
procedures.
THE HIGH BAND BA:
(20 watt RF power modules) (refer to Figure 21):
In the high band (talk-in) BA, 3 power supplies are required. The channel modules and
their associated RF power modules are distributed between the 3 VCC sources as
follows:
Channels 1, 2, and 3 to VCC1
Channels 4, 5, and 6 to VCC2
Channels 7 and 8 to VCC3
THE LOW BAND BA:
(6 watt RF power modules)(refer to Figure 22):
In the low band (talk-out) BA, 2 power supplies are required. The channel modules and
their associated RF power modules are distributed between the 2 VCC sources as
follows:
Channels 1, 2, 3 and 4 to VCC1
Channels 5, 6, 7 and 8 to VCC3