Lucent Technologies Lineage
®
2000 ECS/GPS Battery Plant J85500G-2
Issue 6 May 1999
Product Description 2 - 27
power. The LVD circuit then restores power to the LVD/R
contactor, which reconnects the batteries to the rectifiers and
load. The batteries are then free to accept charging current from
the rectifiers.
Thermal
(slope/step)
compensation
feature
The 216A ECS Thermal Compensation Unit, used in
conjunction with the BMD1, LVD/R Fuse circuit pack, provides
reduction in plant voltage for measured temperatures above
25°C (77°F) in a slope-plus-step manner. The BMD1 reduces the
plant voltage 72mV per degree Celsius for a maximum of
2.0VDC below the uncompensated voltage. The compensation
stops at approximately 53°C (127.4°F). For temperatures higher
than 53°C but less than 75°C (167°F), a constant voltage drop of
2.0VDC below the uncompensated voltage is maintained. For
temperatures higher than 75°C the plant voltage is reduced 6
volts below the uncompensated 25°C voltage. The plant voltage
is raised 4.0 VDC when the temperature returns to 65°C (149°F).
A green indicator is illuminated to reflect an active module. A
yellow indicator illuminates to reflect temperatures above 53°C
and blinks to reflect temperatures above 75°C.
The 216A Control Unit also has the ability to increase the plant
voltage for sensor temperatures below 25°C. The plant voltage
is increased 72 mV per degree Celsius to a maximum of 2.0
VDC above the float voltage. The BMD1 is shipped from the
factory with this margining feature disabled.
216A control unit accepts up to eight thermistors (two per
battery string). Up to five 216A modules can be daisy-chained
together which gives the ability to monitor up to 20 battery
strings.
Two types of thermistor kits are available for use with the 216A
Control Module:
1. Thermistor Kit, Paddles Comcode 847618048. Use this kit
with the VR Batteries. The kit contains two thermistors
that are inserted between the battery cells. Figure 4-7
shows an example of the thermistors inserted into the
battery string.
2. Thermistor Kit, Rings Comcode 847618063. Use this kit
when the battery cells are not adjacent to each other (e.g,.
an air gap is present between cells). The ring terminal is a
