SBS AT10.1 SERIES, Operating And Service Instructions

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SERVICING THE AT10.1
51
SYMPTOM
PROBABLE
CAUSE
RECOMMENDED ACTION
No output
current, but
AC ON lamp
is out
ac & dc
breakers, or
fuses, are on
1. Site ac supply
failure
2. Optional ac
input fuse
(F1A/F1B) is
blown
3. Defective
wiring
4. Defective
transformer (T1)
1. If AC ON indicator is out, check the external (site) feeder circuit
breaker or input fuses.
2. Remove the input fuses from their box holder. Check if blown
with an Ohmmeter or fuse tester. Replace F1A and/or F1B as
needed.
NOTICE If the replacement fuses blow, see the Sections
titled "AC breaker trips immediately" and "AC breaker trips after a
few minutes" for further troubleshooting hints.
3. Check the terminals and all wiring in between the transformer
secondary (T1-X#) and the dc output terminals (TB1+/-). Check
wire #
44 from T1-Y1 and wire # 45 from T1-Y2 to the Gate Driver
PC Board connector (A11-J18). Repair wiring as necessary.
4. Use an ac voltmeter to measure the
secondary potential from
T1-X1 to X5. It is normally 50% to 80% higher than the rated dc
output voltage. If it is too low, check the
primary tap wiring. See
Section 1.6 for details. If the primary (T1-H#) voltage is 0 Vac,
replace the main power transformer (T1).
No output
current, but
AC ON lamp
is on
ac & dc
breakers, or
fuses, are on
1. Battery is fully
charged
2. Float or
Equalize Vdc is
set too low
3. Wrong ac
input voltage, or
T1 mis-wired
4. Defective
wiring
5. Defective
SCR module
6. Defective
Gate Driver PC
Board (A11)
7. Defective
transformer
8. Defective
inductor (L1 or
L2)
9. Defective dc
output circuit
breaker (CB2)
1. This is normal operation in a charger/battery system with little
or no dc load. As long as the AT10.1 maintains Float voltage, it is
operating normally.
2. Check the Float and Equalize voltages and adjust them if
necessary. Consult your battery manufacturer for proper voltage
settings.
3. Confirm the transformer primary taps (T1-H#) are wired
correctly for your ac input voltage. See Section 1.6 for details.
4. Check the terminals and all wiring in between the transformer
secondary (T1-X#) and the dc output terminals (TB1+/-). Repair
as necessary.
5. Use an ac voltmeter to measure the voltage between the gate
leads on each SCR module. If you measure about 1.0V rms, but
there is no output current, replace SCR modules (Q1/Q2) as
needed.
6. If you do not measure any ac voltage in Step 5 above, and the
battery voltage is less than the Float voltage setting, replace the
Gate Driver PC Board (A11).
7. Use an ac voltmeter to measure the ac voltage from T1-X1 to
X5. If it is too low, check the wiring of the primary taps. See
Section 1.6 for details. If the ac primary (T1-H#) voltage is 0 Vdc,
replace the main transformer (T1).
8. Disconnect the wiring at the main inductor and measure the
resistance between the terminals (L1-1/2). If it is an open circuit,
replace the inductor (L1). If the optional dc filter is installed,
repeat at inductor terminals (L2-1/2).
9. Shut down the AT10.1 and disconnect the battery. Connect a
light dc load to the AT10.1 and turn on (close) the dc output circuit
breaker (CB2). Measure dc voltage across TB1(+) and TB1(-). If
no voltage is measured, replace the dc output breaker (CB2).