KEHUA TECH KR2000-RM - 3 Basic Principle and Structure; 3.1 Basic Principle

KR-RM Series(1～3kVA) UPS
User Manual
3 Basic Principle and Structure
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3 Basic Principle and Structure
This chapter mainly describes the working principle and structure of the product, including the
meaning of indicators on the panel and the definition of external port.
3.1 Basic Principle
When the mains is normal, the input of KR-RM series UPS converts into the steady DC voltage
through PFC, which supplies for DC/AC inverter to output steady 220V AC and charges the battery
at the time. When the mains is abnormal, the battery will boost into the DC voltage for DC/AC
inverter through DC/DC.
The working principle of KR-RM series(1～3kVA) UPS is as shown in Figure3-1.
Mains
220Vac
Charger
PFC
AC/DC
Transfer
switch
Batteries
DC/DC
DC/AC
Load
Figure3-1 Working principle of KR-RM series(1～3kVA) UPS
The pin corresponding relationship between RS232 port of UPS and RS232 port of PC is as shown in
Table3-1.
Table3-1 The pin corresponding relationship between RS232 port of UPS and RS232 port of PC
RS232 port of UPS
RS232 port of PC
9(3)
2(receiving end)
6(2)
3(transmitting end)