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JD5003-00
8. Check your work. Be sure 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 startup 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 float and equalize voltage settings to the battery manufacturer's
recommended values, as described in the AT30 Operating and Service
Instructions, Section 2.3.2.
If the TempCo 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 remote TempCo 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 you are experiencing any inconsistencies in the AT30 when the remote
TempCo probe is utilized, temporarily disconnect the probe and refer to
earlier sections of this Application Note (JD5003-00) for further details.
JD5003-00.Rev6.doc
AT10.1/AT30 Series Battery Charger
NOTICE
Page 7 of 8
Application Note
Rev. 6 - Last Printed 10/31/2014 10:31:00 PM
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