13
2.5
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 battery charger 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 charger. 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 charger’s output voltage based on the
temperature read by the temperature probe. An internal temperature probe is standard and will compensate for
overall ambient temperature changes if the batteries and charger are in the same room. The accuracy of
temperature compensated charging can be greatly enhanced by using an optional remote temperature probe
directly on the battery (Option 11W/11Y).
Option 11W includes a 24-foot long temperature probe and Option 11Y includes a 100-foot long temperature
probe. With either option, approximately two feet of the probe is taken inside the charger enclosure.
External Probe Connection Procedure
Before making any connections to the TPSD2, ensure that the AC Power is off at the main breaker box and the
charger’s breakers are off. Verify that no voltage is present by using a voltmeter at all input and output terminals.
Procedure for Standard Chargers:
1.
Locate the
TS-6
terminal strip inside the charger.
2.
Connect wire marked
F
to terminal
1
and wire marked
G
to terminal
2
. Refer to Figure 11.
3.
Connect the black lead of the external probe to the other
end of terminal
1
, and the red lead to the other end of
terminal
2
.
4.
Place the external probe in a desired location.
(It is recommended that the battery manufacturer be
consulted for placement of the probe)
Procedure for Chargers with S2A-406 Board:
1. Locate the
J4
terminal strip on the S2A-406 board.
2.
Toggle the
SW1
switch on the S2A-406 board to the
External position. Refer to Figure 12.
3. Connect the black lead of the external probe to
terminal
2
of
J4
, and the red lead to terminal
1
of
J4
.
4. Place the external probe in a desired location.
(It is recommended that the battery manufacturer be
consulted for placement of the probe)
Figure 11 – Temperature Compensation Connections
(External and Internal)
Figure 12 – Temperature Compensation Connections
(External and Internal for S2A-406 Board)
