KEHUA TECH KR2000-RM - 5.6.2 Periodic Preventative Maintenance; 5.6.3 Common Abnormal Problem Analysis

KR-RM Series(1～3kVA) UPS
User Manual
5 Use and Maintenance
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 Observe the safety operation regulations. If any doubt, consult the person who is familiar with
UPS.
 Remember that there always exists dangerous voltage inside UPS. Before maintenance and
adjustment, use a voltmeter to check the power is turned off and in a safety condition.
5.6.2 Periodic Preventative Maintenance
To improve the efficiency and reliability of UPS, please complete the following preventative
maintenance operations periodically:
 Keep environment clean to avoid dust or chemical pollution to UPS.
 Carefully check whether the input and output wiring terminals are with good contact once every
half an year.
 Check the working status of fans periodically, which is for heat dissipation. Prevent sundries
from blocking the air outlet. If any damage, please replace it in time.
 Check the battery voltage and the working status of UPS periodically.
5.6.3 Common Abnormal Problem Analysis
When starting UPS, if it can't works normally, don't regard it as the UPS failure directly, solve the
problems referring to the following methods.
Table5-1 Common abnormal problem analysis
Phenomenon
Possible reasons
The mains is normal. When starting
UPS, it can output AC 220V. But it is
in the battery inverting status, and the
buzzer beeps intermittently.
The grid feeding circuit that connects with UPS is not
firmly connected, including each connection point and
connection socket, which make the AC power input
blocked.
When finishing the UPS installation,
switch on the switch or long press the
startup button " ", it will fuse the
fuse or switch off the switch.
The wiring of the three-phase in the input is wrong, such
as connect the neutral wire or the live wire with the
grounding wire of UPS(enclosure). or the wiring of the
three-phase in the output is wrong.
When starting UPS, it has output. But
UPS works in the bypass status("
" indicator is always on.)
The load is too heavy, which is beyond the rated power of
UPS. It should reduce load or select UPS with larger
power capacity. It is normal that UPS works in the bypass
status temporarily for load startup impact and then