Exide Technologies Section 94.30 - Manual (Page 54)

SERVICING THE AT10.1
50
SYMPTOM PROBABLE
CAUSE
RECOMMENDED ACTION
DC breaker
trips (or fuses
clear)
immediately 1. Battery
connected with
reverse polarity
2. Defective
rectifier bridge (if
unfiltered
charger)
3. Defective
diode CR4
4. Defective
polarity diode
CR1 (if filter
assembly is
installed)
5. Defective
wiring
1. Check and correct battery wiring if necessary.
2. 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.
3. Disconnect wire # 15 from the lower bus bar (W1+) on the heat
sink assembly. Measure the resistance through the diode (it’s
mounted on the other bus bar). Check both polarities; it should be
at least 100,000 Ohms in one polarity, and less than 1,000 Ohms
in the other polarity. Replace the free-wheeling diode (CR4) if it is
defective.
4. Disconnect wire #
17 from the dc circuit breaker (CB2), or the
dc fuse (F3). Measure the resistance through the polarity diode
(CR1) mounted on the current shunt (R1). Check both polarities; it
should be at least 100,000 Ohms in one polarity, and less than
1,000 Ohms in the other polarity. Replace the polarity diode
(CR1) if it is defective.
5. Check spacing of terminals and check wiring for signs of
insulation damage, burns, etc. Repair as necessary.
DC breaker
trips (or fuses
clear) after a
few minutes 1. Loose
connection to
breaker
2. Open SCR
3. SCR not
controllable
4. Defective
Gate Driver pc
board A11
5. Defective
Main Control
board A1
1. Check and tighten connections as required.
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.
3. 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.
4. If the front panel meter shows more than 110% of rated dc
current, the Gate Driver pc board (A11) may be defective. Unplug
the A11 from the Main Control board (A1). If the output current
does not go to zero, replace A11.
5. If the front panel meter shows more than 110% of rated dc
current, the control board may be defective. Unplug the system
harness connector (J18) from the Gate Driver pc board (A11). If
the output current goes to zero, replace the Main Control board
(A1).