Lucent Technologies 60V Small Broadband Power System J85500Q-1
6 - 8 Alarms, Controls, and Displays
Issue 4 October 1998
however, the power circuits are inhibited to prevent these units
from producing output power. To switch the power units from
Standby to On, both the local and remote control signals must be
switched to the power On state.
Temp Comp
This LED indicates that the battery thermal protection feature is
working. Whenever the battery temperature exceeds 25° C, the
plant voltage is automatically reduced to help protect the
batteries against thermal instability.
If the temperature of the batteries exceeds 25° Celsius (77°
Fahrenheit), the thermal management control transmits a signal
to the alarm and control unit, which then lowers the float voltage
on the batteries proportionally to the rise in temperature above
25° Celsius and lights a yellow LED on the LVD/Thermal
Management circuit pack. The thermal compensation algorithm,
demonstrated in Figure 6-1, operates as follows:
•
As temperature rises between 25° C and 53° C (127° F),
plant voltage is lowered 108mV per degree. At 53° C the
plant voltage is 3 volts less than the uncompensated battery
float voltage.
•
For temperatures between 53° C and 75° C (167° F), the
plant voltage remains at 3 volts less than the uncompensated
battery float voltage.
For temperatures higher than 75° C, the plant voltage is reduced
to approximately 72 volts.
Test Jacks
Test points are provided on the BPS faceplate so that the plant
battery voltage and the plant output voltage may be checked with
the user's meter. The test points are current-limited to protect
against accidental short-circuits.
Thermal Alarm
This red LED lights whenever the rectifier shuts down due to
inadequate air flow indicating possible intake air blockage, fan
failure, or inlet air temperature above 75° C.
Voltage Adjust
A potentiometer is provided on the BPS faceplate to allow the
customer to adjust the rectifier output voltage. If the BPS panel
loses power, the Voltage Adjust signal from the BPS is
