Exide Technologies Section 94.30 - Manual (Page 58)

SERVICING THE AT10.1
54
SYMPTOM PROBABLE
CAUSE
RECOMMENDED ACTION
Input current
too high 1. Wrong ac
input voltage, or
T1 wired
incorrectly
2. Defective
rectifier bridge
3. Defective
Transformer T1
1. Be sure the 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.
2. Disconnect wires # 51/52 and # 53/54 from the SCR gate lead
terminals (these are the small gauge twisted pairs). Be sure to
note the original polarity, so that they can be replaced with the
same polarity. Restart the charger. If You are able to measure
output current, one of the SCRs is defective. Replace the rectifier
modules.
3. Test by disconnecting wires from X1, X5, Y1 and Y2. If ac input
current is still too high, replace the transformer (T1).
Output ripple
voltage too
high 1. Charger is
unfiltered
2. Battery is
disconnected or
defective
3. Battery too
small for charger
rating
4. Defective filter
capacitors, C1
and/or C2
1. Verify by checking nameplate against the ordering code on the
inside front cover. Order and install the filter option if necessary.
2. Be sure battery is connected. Inspect battery according to the
manufacturer's instructions.
3. Check the measured ripple against the specification for your
AT10.1 model on page 70. The ripple rating is for a battery whose
Ampere-hours are four (4) times the charger ampere rating. For a
smaller battery, ripple voltage may be higher.
4. Test with capacitance meter; replace C1 and/or C2 as needed.
Charger very
noisy 1. Loose
hardware or
enclosure panel
2. Defective
rectifier bridge
1. Check and tighten all component mounting hardware and panel
hardware.
2. 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.
Meter
readings are
erratic 1. Defective or
disconnected
battery
2. Defective
scaling resistor
R4 or R14
3. Defective
Main Control pc
board A1
1. Turn off the charger. With a light dc load connected to the
battery, be sure each cell reads the nominal cell voltage (2.0 V for
lead-acid; 1.25 V for Ni-Cd). Restart the charger. Each cell should
now read approximately the nominal Float voltage (2.2 V for lead-
acid; 1.35 V for Ni-Cd).
2. 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 R14 as needed.
3. If the output voltage is constant, but the front panel meter is
erratic, replace the Main Control board (A1).