Smartbitt SBOL50KTIII-3, Service Manual, Page: 25 / 57

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8.1.2 Trouble shooting for fault codes in LCD display
When the UPS is fault, it will transfer to Fault mode.
7.1.2.1 Fault code for 10k~80k
Code
LCD
icon
Fault Event Description Action
01 None BUS start failure
When the bus voltage can’t
reach the setting value in
30s, the fault signal will be
displayed. Check if power components such as IGBT and
SCR for the PFC and the utility power SCR are
well. Meanwhile, check if the components on
the drive circuit are well.
02 None
BUS over
When one of the following
conditions occurs, the fault
signal will be displayed.
+Bus voltage keeps higher
or the –BUS voltage keeps
lower than normal.
If line mode and battery mode all alarm 02
fault, it is means the PFC part have problem.
If line mode alarm 02 fault, but battery mode
can work normal, the reason is bypass part
circuit have problem. Please check the INV
relay and bypass SCR.
If the PFC board is damaged;
Check if power components such as IGBT and
SCR for the PFC and the utility power SCR are
well. Meanwhile, check if components on the
drive circuit are well.
03 None BUS under
When +Bus voltage keeps
lower or the –BUS voltage
keeps higher than normal,
the fault signal will be
displayed. Maybe the PFC board is damaged.
Check if power components such as IGBT and
SCR for the PFC and the utility power SCR are
well. Meanwhile, check if components on the
drive circuit are well.
04 None BUS unbalance
When the difference
between the ±Bus voltage
absolute value, the fault
signal will be sent.
Maybe the PFC board is damaged.
Check if power components such as IGBT and
SCR for the PFC and the utility power SCR are
well. Meanwhile, check if components on the
drive circuit are well.
06 None PFC over current
When the current of
PFC/Boost is over current,
the fault signal will be
display
Maybe the PFC board is damaged.
Check if power components such as IGBT and
SCR for the PFC and the utility power SCR are
well. Meanwhile, check if components on the
drive circuit are well.
11 None INV start failure
Inverter voltage can’t reach
the setting value.
Check the inverter drive circuit.
12 None
High inverter
voltage
When INV voltage keeps
higher than normal, the
fault
signal will be
displayed.
Check if power components in power INV and
on the drive circuit are normal. Check if IGBT
protective circuit and some INV components
are normal.
13 None
Low Inverter
Voltage
When INV voltage keeps
Lower than normal, the
fault
signal will be
displayed.
14
Inverter L1
output short
When INV phase L1
output
voltage keeps lower
and output current keeps
higher than normal, the
fault signal will be
displayed.
Remove all the loads. Turn off the UPS.
Check
whether the output of UPS and loads are
short
circuited. Make sure the short circuit is
removed, and the UPS has no internal faults
before turning on again.
15
Inverter L2
output short
When INV phase L2
output
voltage keeps lower and
output current keeps
higher than normal, the
fault signal will be