Smartbitt SBOL50KTIII-3, Service Manual

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1. General Information
1.1 Getting start
This manual is for Smartbitt
Ⅲ
30K(L)~200K(L) tower UPS. It can help service person perform the basic
maintenance and repair service.
This manual only focuses on the service section, so you should get the basic operation of the UPS from the
user manual, and make sure you had read and understood the user manual before reading the manual.
The manual includes 9 sections:
● General Information, this section shows you the general information of the service manual.
● Electric Specifications, this section shows you the basic electric specification of the UPS.
● Functional block, this section shows you the major functional block of the UPS.
● Working Principle of the Major Functional Block, this section shows you the working principle of the
major functional block.
● Function explanations for each PCB, this section explains you all the PCBs of the UPS system.
● Interface, this section shows you the LCD interface, including display and setting.
● Trouble Shooting, this section gives you the way to find the problems.
● Test Step, this section tells you how to test the UPS after you repair the unit.
● Appendix, this section shows you the basic waveforms for reference and the basic communication
commands.
1.2 Important Safety Instructions
For qualified service person only.
DO NOT perform any internal service or adjustment of this product unless the technical person is well
trained and experienced. .
Dangerous voltage exists at several points in this product. To avoid personal injury, don't touch any
exposed connections or components while UPS is on.
Turn off the UPS and switch off the input breaker before removing protective case.
AC voltage is always present if the input AC power is still available.
High voltage may exist at DC capacitors. Before removing the protective case, wait for at least five
minutes after turning off the UPS.
Verify input source (voltage and frequency) is within the maximum range before service.