KStar YDC9300-RT - Appendix 3 Problems and Solution; Common UPS Problems and Solutions

41
Appendix 3 Problems and Solution
In case the UPS can not work normally, it might be wrong in installation, wiring or operation.
Please check these aspects first. If all these aspects are checked without any problem, please
consult with local agent right away and provide below informations.
（1） Product model name and serial number, which can be found in LCD display.
（2） Try to describe the fault with more details, such as LCD display info, LED lights status,
etc.
Read the user manual carefully, it can help a lot for using this UPS in the right way. Some FAQ
(frequently asked questions) may help you to troubleshoot your problem easily.
No.
Problem
Possible reason
Solution
1
LCD not display
The network cable is not fixed
properly or the telephone line
of the front door is not fixed
properly.
Connect the network cable and
telephone cable properly.
2
LCD Blue screen
LCD is Interferenced
Take out the cable and insert back
properly
3
Utility is connected
but the UPS can not
powered ON.
Input power supply is not
connected;
Input voltage low;
The input swith of the module
is not switched on .
measure if the UPS input
voltage/frequency are within the
window.
Check if all modules input are
switched on
4
Utility normal but
Utiltiy LED does not
light on, and the UPS
operates at battery
mode
The input breakers of the
Modules are not switched on;
input cable is not well
connected
Switch on the input breaker;
Make sure the input cable is well
connected.
5
The UPS does not
indicate any failure,
but output do not
have voltage
Output cable does not well
connected
Make sure the output cable is well
connected.
6
The UPS module
can not transfer to
bypass or inverter
Module does not well
inserted;
The left coronal screw is not
tight.
Output breaker do not switch
on
Pull out the module and insert again;
Tighten the screw;
Switch on the output breaker.
7
The UPS module
fault LED remains
ON
The module is already
damaged
Take out this module, replace with a
new module.
8
Utility LED is
flashing
Utility voltage exceeds UPS
input range.
If the UPS operates at battery mode,
please pay attention to the remaining
backup time needed for your system.