Exide Technologies Section 94.30 - Manual (Page 61)

SERVICING THE AT10.1
57
SYMPTOM PROBABLE
CAUSE
RECOMMENDED ACTION
AC INPUT
FAILURE
indicator is on
1. AC power
failure
2. Upstream
feed
breaker/fuse is
tripped
3. Defective
wiring
4. Defective
Main Control
board A1
1. If the ac input power fails, the front panel AC ON indicator
goes out, and the AC INPUT FAILURE indicator goes on.
2. Be sure the front panel ac circuit breaker is closed. Measure
the ac voltage at TB1-L1 and TB1-L2. If it is zero, check
upstream distribution breakers and fuses.
3. Measure ac voltage at T1-H1 and T1-H5. It should be the
same as the ac supply voltage.
4. Turn off both front panel circuit breakers (CB1/CB2). If the
charger does not have breakers but fuses (F1/F2 and F3/F4),
turn off ac and dc power externally. Start up by turning on the
dc breaker, followed by the ac breaker. If the
AC ON indicator
is on, but the
AC INPUT FAILURE indicator is still on, replace
the Main Control board (A1).
POS GND or
NEG GND
indicator is on 1. Ground fault
on external dc
bus
2. DC circuit
breaker is open
and
NEG GND
indicator is on
3. Alarm needs
calibration
4. Defective
wiring
5. Defective
Main Control
board A1
1. Disconnect the charger from the battery and dc bus, and
check the battery and dc bus for a ground fault.
2. If the AT10.1 has been placed into standby by opening the
dc breaker (CB2), the ground detection circuit gives an
erroneous alarm. Close the dc breaker and the alarm should
end. If you want the AT10.1 to be in standby, open the ac
circuit breaker (CB1).
3. Calibrate the ground detection sensitivity. See Section
2.3.4.
4. Disconnect the charger from the battery and dc bus. Turn
the charger on, and measure the voltage from TB1(+) to
chassis, and from TB1(-) to chassis. The voltage readings
should be equal, each approximately half of the total output
voltage. If there is more than a 10% imbalance, turn off the
charger, and inspect all wiring from TB1 to the dc circuit
breaker (CB2), the main inductor (L1), filter assembly (if
present), and the rectifier bridge. Look for evidence of
insulation damage, insufficient spacing between terminals and
chassis, or wires run too close to metal edges.
5. Turn off both front panel circuit breakers (CB1/CB2). If the
charger does not have breakers but fuses (F1/F2 and F3/F4),
turn off ac and dc power externally. Start up by turning on the
dc breaker, followed by the ac breaker. If you are sure there is
no ground fault on the external bus or within the charger, but
the
POS GND or NEG GND indicator is still on, replace the
Main Control board (A1).
Summary
alarm relay is
in alarm
mode, but no
front panel
alarm
indicator is on 1. Defective
Main Control
board A1 1. Turn off both front panel circuit breakers (CB1/CB2). If the
charger does not have breakers but fuses (F1/F2 and F3/F4),
turn off ac and dc power externally. Start up by turning on the
dc breaker, followed by the ac breaker. If the relay remains in
alarm mode, check the Low Level Detect indicator on main
control board. See Section 2.3.8. If no other alarm is on,
replace the Main Control board (A1).