Exide Technologies Section 94.30 - Manual (Page 53)

SERVICING THE AT10.1
49
3.4. TROUBLESHOOTING CHART
SYMPTOM PROBABLE
CAUSE
RECOMMENDED ACTION
Front panel
meter
displays all
segments
“On” or all
segments
“Off.” Charger
may have no
output. 1. An external
surge has
interrupted
operation of the
microprocessor
or the display
controller. 1A. Soft Reset of control board by pressing S7 reset switch.
S7 is located inside the charger, on the control board’s right
edge (as viewed from the rear of the front panel). This will
restart the control board without modifying any settings.
1B. Hard Reset of control board by pressing and holding the
“UP” button on the front panel, and simultaneously pressing
S7 reset switch. This will restart the control board and restore
all settings to factory default. Reset parameters per Section
2.3 of this manual.
1C. Remove all power from charger to allow control board to
discharge all voltages. This can be done by opening the AC
circuit breaker and disconnecting the control board plug(s).
Keep power removed for approximately 5 minutes to allow
voltages to discharge.
AC breaker
trips (or fuses
clear)
immediately 1. Shorted
rectifier diode
or SCR
2. Defective
wiring to T1 or
to the rectifier
bridge
assembly
3. Defective
transformer T1
1. Test by disconnecting wire # 6 from the rectifier module on
the right heat sink, or if possible at the other end from T1-X1.
Measure resistance between the ac terminals (bottom
terminals) on the rectifier modules. It should be at least
100,000 Ohms (check both polarities). Replace rectifier
modules if resistance is low in either direction.
2. Check spacing of terminals and check wiring for signs of
insulation damage, burns, etc. Repair as necessary.
3. Test by disconnecting wires from X1, X5, Y1 and Y2. If ac
breaker still trips, replace the transformer (T1).
AC breaker
trips (or fuses
clear) after a
few minutes 1. Loose
connection to
breaker/fuse
2. Wrong ac
voltage, or T1
taps miswired
3. Open SCR
4. SCR not
controllable
1. Check and tighten connections as required.
2. Be sure the T1 primary taps are wired correctly for your
input voltage. See Section 1.6 for details.
3. Use a clamp-on ammeter to measure the current in wire #
5
or #
6 (between 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.
4. 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.