Lucent Technologies CPS4000 - Table 7-F: ES646, ES646 B, ES647, and ES648

Lucent Technologies -48V CPS4000/CPS4000 PLUS Cabinet Power System
Issue 13 December 2000 Alarms, Controls, and Displays 7 - 7
Alarms
Adjustable Battery
on Discharge (BD)
In the event that AC power is lost, the batteries provide power for the
load. While the batteries are providing the plant's power, the plant
voltage will decrease below the float voltage. The ES646, ES646B, and
ES648 MCUs, and the ES647 ACU monitor the plant voltage and issue
a Battery on Discharge (BD) alarm. DIP switch SW440 on the control
unit controls the set point for the BD threshold. Whenever the plant
voltage drops below this preset threshold, the ES646, ES647, ES648A,
and ES648C issue a BD alarm and a PMJ alarm if SW1 position 3 is
closed. The ES646B, ES648B, and ES648BZ issue only a BD alarm.
Voltage Threshold
for the BD Alarm
The voltage threshold for the BD alarm is selected using SW440 on the
main circuit board of the control unit. See Table 7-F. The setpoint is
typically at least one volt below the low-temperature plant float
voltage for nominal -48V plants without battery thermal
management. If battery thermal management is used, the BD setting
should be at least three volts below the plant float voltage when the plant
is at room (ambient) temperature. This lower threshold is required to
prevent a BD alarm from occurring as the plant float voltage is lowered
as a result of high temperature. The factory default BD setting is 51.0V*.
Table 7-F: ES646, ES646B, ES647, and ES648
SW440 BD Settings
123456Voltage
CCCCCO 46.0
OCCCCO 46.5
C O C C C O 47.0
O O C C C O 47.5
C C O C C O 48.0
O C O C C O 48.5
C O O C C O 49.0
O O O C C O 49.5
C C C O C O 50.0
O C C O C O 50.5
C O C O C O 51.0*
O O C O C O 51.5
C C O O C O 52.0
O C O O C O 52.5
C O O O C O 53.0
OOOOCO 53.5
CCCCOO 54.0
O C C C O O 54.5
C O C C O O 55.0
O O C C O O 55.5
C C O C O O 56.0