3 Checking and starting the operation
3-1 Names and functions of each part of the operation and display sections
BU5002R/BU3002R/BU3002RH
72
○: ON, ●: OFF
UPS
status
Icon
Symbol
Buzzer
Out
put
Charge
Text
displayed
on top
Description
Solution
Chargi
ng
system
failure
○
(Note
1)
●
●
Contin
uous
ON
Charge
stop
Fault-E17
A failure
occurred on the
battery charging
system.
Turn ON only the
power switch again.
If the displayed
content does not
change, the UPS is
faulty. Contact the
shop of purchase.
Control
circuit
fault
○
(Note
1)
○
(Note
1)
●
Intermitt
ent,
at
intervals
of 0.5
seconds
ON
or
OFF
ON
or
dischar
ging
Fault-E20
A fault in the
internal circuit of
the UPS has
been detected.
Operation continues
but the UPS is faulty.
Contact the shop of
purchase.
Bypass
mode
○
●
●
Dependi
ng on
the
failure
condition
s
ON
OFF
Bypass
mode
Commercial
power is being
output as-is in
bypass mode.
Refer to the
message displayed
at the bottom.
Note 1: Varies depending on the operational status.
■ UPS failure details
Text
displayed
on top
Failure details
Solution
Fault-EO Overload stop
There is a fault due to an overload. If the UPS is
in normal operation, it is switched to bypass
operation, and if the load increases further, the
output stops. If the UPS is in backup operation,
the output stops.
Turn off the power switches of all the devices
connected to the UPS, and after reducing the
connected devices, turn on the power switches
of the UPS and the connected devices.
Fault-ES Output short circuit
Output has stopped due to an output short
circuit on the connected device side or a major
connection capacity overload.
Check whether a short circuit is occurring on the
AC input of the connected device, or the
connected capacity is exceeding the rated
capacity.
Fault-E1 Output overvoltage
Due to an error in the output voltage (overvoltage), the
UPS shifts to bypass operation when in normal
operation, and stops outputting power when in backup
operation. (Note 1)
Turn off the power switches of all the devices
connected to the UPS, and turn on the power
switch of the UPS only. If the displayed content
does not change, the UPS is faulty. Contact the
shop of purchase.
Note: The output voltage can be checked from
the LCD Menu by “1. Measurements”-
“Input/Output Meter”. The battery voltage
can be checked by “1. Measurements” -
“Battery Meter”.
Fault-E2 Output undervoltage
Due to an error in the output voltage (undervoltage),
the UPS shifts to bypass operation when in normal
operation, and stops outputting power when in backup
operation. (Note 1)
Fault-E3 Battery overvoltage
Due to an error in the battery charging voltage
(overvoltage), the UPS shifts to bypass operation
when in normal operation, and stops outputting power
when in backup operation. (Note 1)
Fault-E4 Battery undervoltage
Due to an error in the battery charging voltage
(undervoltage), the UPS shifts to bypass operation
when in normal operation, and stops outputting power
when in backup operation. (Note 1)
