Exide Technologies Section 94.30 - Manual (Page 57)

SERVICING THE AT10.1
53
SYMPTOM PROBABLE
CAUSE
RECOMMENDED ACTION
Output
voltage does
not agree
with front
panel meter 1. Temperature
compensation
probe is
installed
2. Circuit board
or another
component may
have been
replaced
3. R4 or R14 is
defective, or
wrong value
4. Defective
Main Control
board A1
1. If the optional temperature compensation probe is installed,
the output voltage may be different from the selected float or
equalize voltage. The difference in the voltages depends on
the probe temperature. The front panel meter always displays
the selected voltage as if the battery were at 77° F / 25° C.
2. Recalibrate meter as described in Section 2.3.7.
3. Locate R4 and R14 on the Gate Driver pc board (A11) on
the back of the front panel. Remove one end of each resistor
and measure its value with an Ohmmeter. See the table in
Section 3.6 for resistance values. If either resistor is not within
1% of the specified value, replace R4 and/or R14 as needed.
4. Turn off both front panel circuit breakers (or turn off ac and
dc power externally if the charger doesn’t have breakers).
Then turn on the dc breaker, followed by the ac breaker. If the
charger still has the wrong output voltage, replace the Main
Control board (A1).
Charger
never
reaches float
(or equalize)
voltage
(within 1%) 1. Current limit
set too low
2. Defective
battery or dc
load, or load is
too great
3. Wrong ac
input voltage, or
voltage too low,
or T1 wired
incorrectly
4. Defective
rectifier bridge
5. Defective
control circuit
board A1
1. If the AT10.1 is not in the Edit mode, press the
EDIT/ENTER key five times, until the meter display flashes the
current limit value (in Amperes). If the current limit is less than
110%, adjust it to 110% as described. See
Setting the Current
Limit Value, Section 2.3.5 for details.
2. Check each cell of the battery. If one or more cells are
shorted, the charger may not be able to reach the Float
voltage. You may have the same problem if the normal load
current is more than the rated output current of the charger.
3. Be sure the transformer (T1) primary taps are wired
correctly for your input voltage. See
Changing Transformer
Taps, Section 1.6. The actual ac input voltage must be at least
88% of the rated value for the charger to produce full output
power.
4. Use a clamp-on ammeter to measure the current in wire # 5
or # 6, between the transformer (T1) and the rectifier modules.
If it less than 50% of the dc output current, one of the SCRs or
diodes is defective. Replace the rectifier module.
5. Turn off both front panel circuit breakers (or turn off ac and
dc power externally if the charger doesn’t have breakers).
Then turn on the dc breaker, followed by the ac breaker. If the
charger output current is below the current limit value, but it
still has the wrong output voltage, replace the control circuit
board.