Smartbitt SBOL50KTIII-3, Service Manual

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74 None
L1 INV IGBT over
current fault
The unit have detected
IGBT fault signal from the
drive board
Check the IGBT drive signal and INV IGBT
circuited
75 None
L2 INV IGBT over
current fault
The unit have detected
IGBT fault signal from the
drive board
76 None
L3 INV IGBT over
current fault
The unit have detected
IGBT fault signal from the
drive board
77 None
ISO transformer
over temperature
Output ISO transformer or
Auto
transformer over
temperature
Check the output load and Transformer Fan
78 None
LCD and MCU
communication
failure
Touch panel and MCU
communication failure Check the flat cable between the LCD and
MCU
8.1.3 Trouble shooting
Problem Possible cause Action
Battery backup time is
shorten
Battery not yet been fully charged.
Keep UPS connected to utility power persistently
for more than 10 hours to recharge the batteries.
UPS overload.
Check the loads and remove some non-critical
loads.
Battery aged. Replace the batteries.
Charger fails Replace the charger.
The UPS cannot power
on after pressing the
button
The button is not pressed and hold long
enough
Press the button continuously for more than 0.5s.
Battery is not connected or battery
voltage is too low, or charger fails.
Check the charger and battery.
UPS failure. Repair the UPS.
8.2 Repair
In this section, some debug skills are listed to help you finding the failed components and problems as
soon as possible. Before proceeding the following steps, we strongly suggest to read previous section
for trouble shooting first. Then check the components listed in section 7.2.4 to find out which block fails.
8.2.1 Basic Instruments and tools
1 、 One computer with RS232 port and one standard RS232 cable;
2
、
Wire cutters and clamps;
3
、
One electric soldering iron;
4 、 One multimeter;
5
、
One oscilloscope(voltage and current probe needed);
6 、 Diagonal pliers, snipe nose pliers, cross screwdrivers (150mm/75mm length), flat screwdrivers
(75mm length) and PVC insulating tapes etc;
7
、
Make-self tools including Balance voltage test equipments, current limiting resistors, tubes and
clamp terminals with different specifications;
8.2.2 Configuration of the Model pin on the Control Board
The Model Port (JS4, JS5 ， JS6) on the CNTL board (71-303067-XXG) and the JS should be
configured as follows:
Table 7.1 Model Pin Setting List