IV420E Rev.00 SIEL S.p.A.
Installation and user manual
Date of issue: 2019-01-29
Pag. 64 di 72+ FR
Appendix 2 Problems and Solution
In case the UPS cannot 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 information.
（
1
）
Product model name and serial number.
（
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
Utility is connected but
the UPS cannot be
powered ON.
Input power supply is not
connected;
Input voltage low;
The input switch of the
UPS is not switched on.
Measure if the UPS input
voltage/frequency is within the
window.
Check if UPS input is switched on
2
Utility normal but Utility
LED does not light on,
and the UPS operates
at battery mode
The input breakers of the
UPS are not switched on;
input cable is not well
connected
Switch on the input breaker;
Make sure the input cable is well
connected.
3
The UPS does not
indicate any failure,
but output do not have
voltage
Output cable does not
well connected;
Output breaker do not
switch on
Make sure the output cable is well
connected;
Switch on the output breaker.
4
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.
5
Battery LED is flashing
but
no charge voltage and
current
Battery breaker does not
switch on, or batteries
are damaged, or battery
is reversely connected.
Battery number and
capacity are not set
correctly.
Switch on the battery breaker. If
batteries are damaged, need to
replace whole group batteries,
Connect the battery cables correctly;
Go to LCD setting of the battery
number and capacity, set the correct
data.
6
Buzzer beeps every
0.5 seconds and
LCD display “output
overload”
Overload
Remove some load
7
The UPS only works
on bypass mode
The UPS is set to ECO
mode, or the transfer
times to bypass mode
are limited.
Set the UPS working mode to UPS
type(non-parallel) or to reset the times
of transferring to bypass or re-start the
UPS
8
Cannot Black start
Battery switch is not
properly closed:
Battery fuse is not open:
Or Battery low:
Battery quantity set
wrong;
Power breaker in the rear
panel not switch ON.
Close the battery switch:
Change the fuse:
Recharge the battery:
Power ON the UPS with AC to set the
battery quantity &quantity;
Switch on the power breaker.
Summary of Contents for 50-200kVA PF-1 UPS
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