Using Temperature Compensation - HindlePower AT30 SERIES Operating And Service Instructions

INSTALLING THE AT30
8. Check your work. Confirm that:
• All connections are secure.
• The shield is connected to ground at the charger end only (A1-J6).
• The cable is connected to the 2-position terminal block (TB8) on the
Main Control PC Board (A1). Other terminal blocks may look similar.
9. Restart the AT30 using the procedure in Section 2.1. During startup, the
AT30 displays Pb on the front panel meter, indicating that the temperature
compensation is set up for lead-acid battery types. While this is being
displayed, you can press any front panel key to change the display to read
nicd, to change the temperature compensation setup for nickel-cadmium
batteries. The choice you make is saved internally, and will be used again
by the AT30 the next time it starts.
10. Adjust the output float and equalize voltages to the battery manufacturer's
recommended values, using the AT30 front panel meter, as described in
Section 2.3.2.
If the temperature compensation probe, or the probe wiring, is
damaged and becomes an open circuit, the AT30 detects the
damage and displays E 08 on the front panel meter. The AT30
then reverts to normal non-temperature-compensated
operation until the probe or wiring is repaired. Once the probe
is repaired, you must restart the AT30 to activate the probe, as
described in Section 2.1.

Using temperature compensation

When an electric storage battery is being charged, the terminal voltage of
the battery changes a small amount whenever the battery temperature
changes. As the battery temperature increases, its terminal voltage
decreases. When a constant output voltage float type rectifier charges a
battery, float current increases when the temperature increases. This
results in overcharging the battery, which can result in damage to the
materials, or at least the need for more frequent maintenance.
When the AT30 is equipped with a temperature compensation probe, it is
able to adjust the output voltage applied to the battery to keep the float
current constant, thereby avoiding overcharging. The probe senses the
ambient temperature at the battery, and adjusts the output float/equalize
voltages to compensate for variations in temperature. If the ambient
temperature increases, the AT30 output voltage decreases.
If any inconsistencies are experienced in the AT30 when the
temperature compensation probe is utilized, temporarily
disconnect the probe. Refer to Application Note (JD5003-00)
for further details.
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NOTICE