Troubleshooting - Omron S8T-DCBU-02 Manual

Troubleshooting

The following table lists the errors that may occur when the S8T-DCBU-02 is used, along with their probable causes and remedies. Check the rel-
evant items.
When
During installation The S8TS-06024@ and
S8T-DCBU-02 cannot be
connected.
When checking The S8TS-06024@ con-
operation nected in step 2 of the oper-
(Refer to Checking ation checking procedure
Operation on does not operate.
page 6.)
The READY indicator on
the S8T-DCBU-02 does not
light in step 2 of the opera-
tion checking procedure
when connected to the
S8TS.
The READY indicator on
the S8T-DCBU-02 does not
light in step 2 of the opera-
tion checking procedure.
The backup operation is not
performed for the expected
backup time in step 4 of the
operation checking proce-
dure.
The voltage output for the
backup operation is low in
step 4 of the operation
checking procedure.
Cause
The Bus Line Connector is provided with a se-
lector to prevent misconnection of 12-V and 5-V
S8TS Blocks. Connection will not be possible if
the selector is set for the wrong type of Block.
The AC line is not connected by the
S8T-BUS03 Bus Line Connector when the
S8TS-06024@ is connected.
The S8T-DCBU-02 may be connected between
two S8TS-06024@ Blocks.
Power is supplied via the S8T-BUS03 Bus Line
Connector when the S8T-DCBU-02 and S8TS
are connected. The Bus Line Connector may
not be connected.
A Bus Line Connector that does not connect the
DC line (such as the S8T-BUS02) may be con-
nected.
Up to 60 seconds is required to completely
charge the internal capacitor after the power
supply has been turned ON. The READY indi-
cator will not turn ON immediately after the
power supply is turned ON.
The positive and negative I/O terminals on the
S8T-DCBU-02 may be connected in reverse or
the power supply may be connected to an incor-
rect terminal (e.g., an NC terminal).
The voltage input to the S8T-DCBU-02 may be
23 V or less.
Overcurrent protection on the connected power
supply may have operated and the voltage may
have dropped to below 23 V.
The restart time of the connected power supply
after recovery from momentary power failures
may be too long.
The voltage during the backup operation may
be high, increasing the power consumption dur-
ing the backup operation.
The output current during the backup operation
may be higher than expected.
Overcurrent protection on the connected power
supply may have operated and the voltage input
to the S8T-DCBU-02 may have dropped to be-
low 24 V.
The wiring to the load is too long or too thin,
causing excessive voltage drop.
Description
Buffer Block
Remedies
Set the selector on the Bus Line Connector to
24 V.
Refer to S8T-BUS03 Bus Line Connector on
page 5.
Connect the S8T-DCBU-02 to the right or left
end of the connected Blocks. Refer to Mounting
on page 5.
Connect the S8T-DCBU-02 and S8TS-06024@
using an S8T-BUS03 Bus Line Connector. Re-
fer to Basic Configuration on page 1.
Connect the S8T-DCBU-02 and S8TS-06024@
using an S8T-BUS03 Bus Line Connector. Re-
fer to Basic Configuration on page 1.
Check that the READY indicator lights after 60
seconds has passed since turning ON the pow-
er supply. Refer to READY Operation on
page 7.
Check the wiring to be sure it is correct. The in-
ternal circuits of the S8T-DCBU-02 will be pro-
tected even if the positive and negative
terminals are reversed. Refer to Reverse Con-
nection Protection on page 7.
Check the I/O terminals on the S8T-DCBU-02
and adjust the voltage output by the power sup-
ply so that it is 24 V or higher. Refer to Input
Voltage on page 5.
The S8T-DCBU-02 consumes 0.4 A, so the rat-
ed current of the connected power supply can-
not be delivered completely to the load.
Increase the capacity of the connected power
supply. Refer to Selecting the Power Supply on
page 4.
The momentary power failure time differs from
the backup time required to compensate for it.
Change to a power supply with a shorter restart
time or connect S8T-DCBU-02 Blocks in parallel
to increase the backup time. Refer to Selecting
the Power Supply on page 4.
The output voltage during the backup operation
is automatically adjusted based on detecting
the voltage input to the S8T-DCBU-02. Connect
S8T-DCBU-02 Blocks in parallel to increase the
backup time. Refer to Parallel Operation Con-
nection on page 5.
Connect S8T-DCBU-02 Blocks in parallel to in-
crease the backup time. Refer to Parallel Oper-
ation Connection on page 5.
The S8T-DCBU-02 consumes 0.4 A, so the rat-
ed current of the connected power supply can-
not be delivered completely to the load.
Increase the capacity of the connected power
supply. Refer to Selecting the Power Supply on
page 4.
Use the thickest wire and shortest distance pos-
sible. The output voltage during backup will be
up to 2 V lower than the input voltage. Refer to
Wiring Connections on page 5.
S8T-DCBU-02
17