Exide Technologies Section 94.30 - Manual (Page 59)

SERVICING THE AT10.1
55
SYMPTOM PROBABLE
CAUSE
RECOMMENDED ACTION
Lamp test key
does not work,
or some lamps
do not light 1. No Vac
2. Control circuit
board A1 is not
secured to front
panel
3. Defective
Main Control
board A1
1. The lamp test key doesn’t work during an ac power failure.
2. Open the front panel, and be sure that the control circuit board
is securely mounted on the standoffs on the back of the panel. All
indicators should extend about 0.125in / 3.18mm through the front
of the panel.
3. When you press the LAMP TEST key, if some but not all
indicators light, or the digital meter does not display " 8888",
replace the Main Control board (A1).
One or more
front panel
keys don't
work 1. Front panel is
locked
2. Main Control
board A1 is not
secured to front
panel
3. Defective
Main Control
board A1
1. Open the front panel, and be sure that jumper (J9) on the Main
Control board (A1) is in the
ENABLE position.
2. Open the front panel, and be sure that the control circuit board
is firmly seated on the standoffs on the back of the panel. Front
panel keys must operate freely.
3. 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 some of the front
panel keys still do not work, replace the Main Control board (A1).
Two AT10.1s
connected in
parallel, but
only one has
output current 1. If the forced
load sharing
option is not
supplied, check
for normal
operation of
both chargers
2. EJ5126-##
option
1. Multiple AT10.1s are not designed to share load current,
without the optional forced load sharing cable installed. When
two or more AT10.1s are connected in parallel without this option,
it is normal for one of the units to have no output current. You can
check the operation of the "off" charger by increasing its Float
voltage until it starts to deliver output current. When you have
finished the test, be sure both AT10.1s are set to the same Float
and Equalize voltages.
2. See Appendix F on page 92 for troubleshooting of Forced Load
Sharing feature.
HIGH DC
VOLTAGE
indicator is on 1. HDCV alarm
and Equalize
voltage settings
are mismatched
2. Defective
rectifier bridge
3. Defective
Main Control
board A1
1. Be sure that the High DC Voltage alarm setting is higher than
the Equalize voltage setting. See Sections 2.3.2 and 2.3.4.
2. Disconnect wires #
51/52 and # 53/54 from the SCR gate lead
terminals (these are small gauge twisted pairs). Be sure to note
original polarity, so 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. 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 voltage is normal, but the
HIGH DC VOLTAGE indicator is
still on, replace the Main Control board (A1).
No alarm, but
output voltage
is above High
DC Voltage
setting 1. Output current
is below 2%
2. Defective
Main Control
board A1
1. Output current must be greater than 2% of rated current to
produce a High DC Voltage alarm. See
Parallel Operation portion
in Section 2.3.6.
2. 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 voltage is above the alarm setting, but the
HIGH DC VOLTAGE indicator still doesn't light, replace the
control circuit board.