SBS AT10.1 SERIES, Инструкция по эксплуатации и обслуживанию

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SERVICING THE AT10.1
55
SYMPTOM
PROBABLE
CAUSE
RECOMMENDED ACTION
Lamp Test key
does not work,
or some LEDs
do not light 1. No Vac
2. Main Control
PC Board (A1) is
not secured to
front panel
3. Defective
Main Control PC
Board (A1)
1. The Lamp Test key does not work during an ac power failure.
2. Open the AT10.1 front panel door. Confirm the Main Control
PC Board (A1) is securely mounted to the nylon standoffs. All
indicators should extend about 0.125in / 3.2mm through the front
of the panel.
3. Press the
LAMP TEST key. If some, but not all, of the
indicators light, or the digital dc meter does not display " 8888 ",
replace the Main Control PC Board (A1).
One or more
front panel
keys do not
work 1. Front panel is
locked
2. Main Ctrl PCB
(A1) not secured
to front panel
3. Defective
Main Control PC
Board (A1)
1. Open the front panel door. Confirm jumper (J9) on the Main
Control PC Board (A1) is in the
ENABLE position.
2. Open the At10.1 front panel door. Confirm the Main Control
PC Board (A1) is securely, and evenly, mounted to the nylon
standoffs. Front panel keys must operate freely.
3. Turn off (open) both front panel circuit breakers, or lock out ac
and dc power externally if the AT10.1 has fuses only. Wait 60
seconds. Restart by restoring dc power
first , followed by ac
power second. If some of the front panel keys still do not work,
replace the Main Control PC Board (A1).
Two (2)
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 AT10.1s
2. FLS option
(EJ5126-##)
1. Multiple AT10.1s are not designed to share load current,
without the optional forced load sharing cable installed. When
two (2) or more AT10.1s are connected in parallel without this
option, it is normal for one of the units to have no dc output
current. You can check the operation of the "off" AT10.1 by
increasing its Float voltage until it starts to deliver dc output
current. When you have finished the test, make sure both
AT10.1s are set to the same Float and Equalize voltages.
2. See Appendix F on page 92 for troubleshooting of the AT
Series Forced Load Sharing feature.
HIGH DC
VOLTAGE
indicator is on
1. HVDC alarm
and Equalize
voltage settings
are mismatched
2. Defective
SCR module
3. Defective
Main Control PC
Board (A1)
1. Confirm the High DC Voltage alarm setting is higher than the
Equalize voltage setting. See Sections 2.3.2 and 2.3.4 for details.
2. Disconnect the twisted pair wires #
51/52 and # 53/54 from the
SCR (Q1/Q2) gate lead terminals. Note the original polarity so
wires can be replaced with the same orientation. Restart the
AT10.1. If you are able to measure output current, one of the
SCRs is defective. Replace SCR modules (Q1/Q2) as needed.
3. Turn off both front panel breakers, or lock out ac and dc power
externally if the AT10.1 has fuses only. Wait 60 seconds. Restart
by restoring dc power
first , followed by ac power second. If the
AT10.1 output voltage is normal, but the HIGH DC VOLTAGE
indicator is still on, replace the Main Control PC Board (A1).
No alarm , but
output voltage
is above High
DC Voltage
setting
1. Output current
is below 2%
2. Defective
Main Control PC
Board (A1)
1. The AT10.1 dc output current must be greater than 2% of rated
value to produce a High DC Voltage alarm. See
Parallel
Operation passage in Section 2.3.6.
2. Turn off both front panel breakers, or lock out ac and dc power
externally if the AT10.1 has fuses only. Wait 60 seconds. Restart
by restoring dc power
first , followed by ac power second. If the
AT10.1 dc output voltage is above the alarm setting, but the
HIGH DC VOLTAGE indicator still does not light, replace the
Main Control PC Board (A1).