11
2.6
Installing External Temperature Compensation (Option 11W/11Y)
The natural voltage of a battery changes as a function of temperature change. As the battery temperature rises,
the effective voltage of the battery decreases. Without Temperature Compensation, the rectifier will always
produce a set constant output voltage. As the battery temperature increases, this constant voltage will then
induce a higher output current from the rectifier. This higher current can result in overcharging the battery,
which in turn can result in damage to the batteries.
Temperature Compensation combats this overcharging by adjusting the rectifie
r’s
output voltage based on the
temperature read by the temperature probe. In order to increase the accuracy of the temperature
compensation, the external probe can be used to measure the temperature of the battery.
Option 11W includes the compensation circuit and a 24 foot long temperature probe. Option 11Y includes the
compensation circuit and a 100 foot long temperature probe. With either option, approximately two feet of the
probe is taken inside the AUPS enclosure.
External Probe Connection Procedure
Before making any connections to the AUPS ensure that the AC power is off at the main breaker box and that
all of the system
’s breakers are off. Veri
fy that no voltage is present by using a voltmeter at all input and output
terminals.
1.
Locate the terminal strip
TS-6
inside the system.
2.
As illustrated in figure below, connect wire marked
F
to terminal
1
and wire marked
G
to terminal
2
.
3.
Connect the black lead of the probe to the other end of terminal
1
, and the red lead to the other end of
terminal
2
. Refer to Figure 10.
4.
Place the external probe in a desired location (it is recommended that the battery manufacturer be
consulted for placement of the probe).
Figure 10
–
Temperature Compensation Connection
(External and Internal)
Summary of Contents for 7.5K-A1-BD3-125V100A
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