15
S8T-DCBU-01
S8T-DCBU-01
Troubleshooting
This page lists the errors that may occur when the S8T-DCBU-01 is used, along with their probable causes and remedies.
Check the relevant item.
When
Probable cause
Description
Remedies
Installation
S8T-DCBU-01 cannot be
connected.
The Bus Line Connector is provided with a
selector for preventing misconnection of
12 V and 5 V specification S8TS units.
For this reason, connection is not
successful if different specification units
are installed.
Set the selector on the Bus Line
Connector (provided) to 24 V.
Refer to
S8T-BUS03
on page 4 for details.
When checking
the
performances
Refer to
Checking
Performances
on page 4 for
details.
The S8T-DCBU-01 output
indicator does not lit in
operation check procedure,
step 2.
The S8T-DCBU-01 operates by the output
of the S8TS-06024
. A probable cause
is that the Bus Line Connector is not
connected as the input voltage is
connected by the Bus Line Connector
(provided).
Connect the S8T-DCBU-01 to
S8TS-06024
using the Bus Line
Connector (provided).
Refer to
Basic Configuration
on page 2 for
details.
The connected S8TS-06024
does not operate in operation
check procedure, step 2.
A probable cause is that the S8T-DCBU-
01 is connected between S8TS-06024
Basic Blocks.
The S8T-BUS03 Bus Line Connector for
connecting the S8T-DCBU-01 is not
connected to the AC power line. Connect
the S8T-DCBU-01 to the right or left end
of S8TS-06024
Basic Blocks.
The battery status indicator is
lit even 10 seconds or more
after the power is turned ON in
operation check procedure,
step 3.
A probable cause is that the battery was
connected with the + and
−
polarities
reversed.
Connect the battery correctly.
Refer to
Battery Misconnection Protection
Function
on page 8 for details.
A probable cause is that the battery
voltage falls below about 22.5 V. (A
probable cause is battery discharge
during long-term storage.)
Charge the battery before use.
Refer to
Battery Status Indicator / Battery
Status Output
on page 9 for details.
A probable cause is that the backup ON/
OFF input is open.
Short the backup ON/OFF input. (Before
shipment, the backup ON/OFF input is
shorted.)
Refer to
Backup ON/OFF Input Function
on page 8 for details.
A probable cause is that the overcurrent
protection function of the connected
S8TS-06024
is active.
As energy is consumed by S8T-DCBU-01,
the total load capacity of the number of
connected S8TS-06024
s cannot be
obtained. Connect one more S8TS-
06024
Basic Block.
Refer to the
Derating Curve
on page 6 for
details.
A probable cause is that the overcurrent
protection function selector switch on the
S8T-DCBU-01 is set low.
When three or more S8TS-06024
Basic
Blocks are connected, set the overcurrent
protection function selector switch to 11.7
A (typical). (The default setting is 5.7 A
(typical).)
Refer to
Overcurrent Protection Function
Selector Switch
on page 8 for details.
A probable cause is that the output
voltage adjustment trimmer of the
connected S8TS-06024
is set lower
than the factory set voltage.
The S8T-DCBU-01 detects drops in the
output voltage of the S8TS-06024
and
switches over to backup operation. Adjust
the output voltage adjustment trimmer on
the S8TS-06024
so that the output in a
no-load state is 24.5 V or more.
Refer to
Output Voltage Setting of the
S8TS-06024
on page 3 for details.
The backup operation is not
performed in operation check
procedure, step 5.
A probable cause is that inrush current
during backup operation caused the fuse
on the battery to blow.
Select a fuse taking the inrush current
when backup operation is switched to into
consideration. The recommended S82Y-
TS01 Battery Holder is selected taking
this inrush current into consideration.
Refer to
S82Y-TS01 Battery Holder
on
page 3 for details.
