Key to Warning Symbols
CAUTION
【
Installation and Environment
】
·
Minor fires may occasionally occur or wires may become detached
causing the backup operation to fail if screws are not tightened
properly. Torque ratings for field wiring terminals, 9.6 to 10 in-lb
(1.08 to 1.13 N•m) single wire only. 9.6 in-lb (1.08 N•m) for two
wires. Tighten terminal screws to the specified torque so that they do
not become loose.
·
Minor electric shock may occasionally occur. Warning: Not to leave
an open bus connector installed in the end module.
·
Minor electric shock may occasionally occur and the backup
operation will fail if the connector becomes disconnected. Be sure to
lock the slider and track stopper securely when connecting the Basic
Block and the S8T-DCBU-02 to prevent the connector from being
disconnected due to vibration.
·
Internal parts may occasionally deteriorate or be damaged and the
backup operation may not be sufficient. Do not use the
S8T-DCBU-02 for applications that subject the load to frequent
inrush currents or overload currents.
·
The S8T-DCBU-02 may occasionally be damaged. Do not allow any
clippings or cuttings to enter the S8T-DCBU-02 during mounting.
【
Operation
】
·
Minor burns may occasionally occur. Do not touch the terminals or
bus connectors of the S8T-DCBU-02 or primary power supplies
unless the S8T-DCBU-02 is fully discharged.
·
Minor electric shock may occasionally occur. Do not add or remove
the S8T-DCBU-02 while power is being supplied.
【
Maintenance
】
·
Minor electric shock may occasionally occur. Do not disassemble the
S8T-DCBU-02 or touch the interior of the S8T-DCBU-02.
·
Working voltage can be 220V max. inside.
This voltage can be also available 30s after the switch off.
MODEL
S8T-DCBU-02
Thank you for purchasing this S8T-DCBU-02. This INSTRUCTION
MANUAL describes the information such as function,
performance,. and how to use the product required for using the S8T-
DCBU-02.
·
Please operate the S8T-DCBU-02 by the qualified specialist having
the elelctrical know how.
·
Read this instruction manual with enough, and use the product with
enoutgh understandaing.
Keep this instruction manual close at hand and use it for reference
during operation.
©All Rights Reserved
INSTRUCTION MANUAL
·
Warning Symbols
CAUTION
Indicates a potentially hazardous situation which, if not avoided,
may result in minor or moderate injury or in property damage.
OMRON shall not be responsible for conformity with any standards, codes, or
regulations that apply to the combination of the products in the customer's
application or use of the product.
Take all necessary steps to determine the suitability of the product for the
systems, machines, and equipment with which it will be used.
Know and observe all prohibitions of use applicable to this product.
NEVER USE THE PRODUCTS FOR AN APPLICATION INVOLVING SERIOUS
RISK TO LIFE OR PROPERTY WITHOUT ENSURING THAT THE SYSTEM AS
A WHOLE HAS BEEN DESIGNED TO ADDRESS THE RISKS, AND THAT THE
OMRON PRODUCT IS PROPERLY RATED AND INSTALLED FOR THE
INTENDED USE WITHIN THE OVERALL EQUIPMENT OR SYSTEM.
See also Product catalog for Warranty and Limitation of Liability.
Suitability for Use
EN
BUFFER BLOCK
Safety Standards
1. The DC Bus line connector terminals (
,
), I/O terminal (
⑩
,
) are not
insulated.
2. Overvoltage category II.
3. This equipment is for protection class III.
4. Climatic class: 3K3
According to EN62477-1.
5. Warning not to leave an open bus connector installed in the end module.
Nomenclature and dimensions
Fig. 1
Precautions for Safe Use
（１） S etting and Selecting Power Supply to be Connected
1． Do not connect a power supply other than the ones specified below.
Specified Power Supply:
S8TS Series, S8VS Series, S82K Series.
(Only single SELV Power Supply) S82J Series, S8PS Series.
Only power supplies with an output voltage of 24V and an output capacity
of 25W minimum , 600W maximum can be connected.
2． When selecting the power supply to be connected, take both the operation
current and power of S8T-DCBU-02 into consideration, allowing sufficient
margin.
The load shall not exceed the lowest temperature ratings of both the
connected power supply minus the rated charging current of the S8T-
DCBU-02.
3． Do not connect both the S8T-DCBU-02 and the S8T-DCBU-01 to the
same power supply and loads.
（２）
Mounting/Storage Environmen
t
1．
Store the S8T-DCBU-02 at an ambient temperature of –25 to +65
°
C, and
a relative humidity of 25% to 90%.
2．
For UL508 Listing, Surrounding Air Temperature 25
°
C
3．
Use the S8T-DCBU-02 at a relative humidity of 25% to 85%.
4．
Do not use the S8T-DCBU-02 where it would be subjected to direct sunlight.
5．
Do not use the S8T-DCBU-02 where it would be subjected to penetration
of liquid, foreign substance, or corrosive gas.
6．
Do not install the S8T-DCBU-02 in places subjected to shock or vibration.
A device such as a conductor contact breaker may be a vibration source.
Install the S8T-DCBU-02 as far as possible from possible sources of
shock or vibration. Additionally, install a PFP-M End Plate on each end of
the Product.
7．
If the S8T-DCBU-02 is used in an area with excessive high-frequency
noise, be sure to separate the S8T-DCBU-02 as far as possible from the
noise sources.
（３）
Installation/Wirin
g
1． Minor electric shock or malfunction may possibly occur. Connnect the
ground wire completely.
2．
Minor fires may possibly occur. Check the terminals to be sure they are
wired correctly.
3．
Close the terminal cover to help prevent short-circuiting terminals with
foreign objects.
4．
Use the wiring material specified in the following table to protect wires
from smoking and burning due to load abnormalities. Also, the backup
operation may not be sufficient due to voltage drop if thin wiring materials
are used.
Fig.2
OMRON Corporation
1174817-6D
Precautions for Correct Use
■
Power Supply to be Connected
The power consumption of the S8T-DCBU-02 is
approximately 10W, so make sure that the output capasity
of the power supply is sufficient.
If the S8T-DCBU-02 is connected to a previously installed
power supply, the voltage may drop due to the power supply
overcurrent protection, or backup operations may not be
possible.
Note:
Connect a power supply within the specified derating range,
considering the power consumption of the S8T-DCBU-02.
■
Mounting
·
Mounting Direction
Fig.3
Fig.4
Standard mounting
Horizontal mounting
Other mounting
Yes
No
No
Fig.3
Fig.4
·
Mounting Space
Fig.5
Fig.6
＊
1 Direction of air circulation
＊
2 75 mm min
＊
3 75 mm min
＊
4 20 mm min
·
Conncting to the S8TS-06024
□
Fig.7
Fig.8
Fig.9
When connecting one or more S8T-DCBU-02 Blocks to the
S8TS-06024
□
using Bus Line Connectors, connect them to
either the left or right end of the Blocks. Heat dissipation will
be interfered with if the S8T-DCBU-02 Blocks are not
connected to the end.
■ Wiring Method
Fig.10
Fig.11
Fig.12
Fig.13
Note:
Use the largest wire size possible and keep the wiring
distance as short as possible. If the voltage drop caused by
the wiring material is too large, the backup operation may
not be sufficient.
■ Input Voltage
24VDC to 28VDC
Note:
The input voltage to the S8T-DCBU-02 should not be
reduced to 23VDC or below by adjustment or overloading
the power supply because this would cause current to be
sourced from both the power supply and the backup unit at
the same time and the signal output relays will switch
rapidly.
■ Output Voltage
The output voltage for the backup operation is automatically
adjusted internally by detecting the input voltage. The backup
operation is started when the input voltage drops 2V.
Note:
The output voltage during the backup operation is a maximum
of 2V lower than the voltage input at an input voltage of 24V.
■ Backup Time
Fig.14
＊
1 typ value (Vin: 24VDC)
＊
2 Guaranteed Value (Vin: 24VDC)
＊
3 typ value (Vin: 28VDC)
＊
4 typ value for 2 products connected in parallel (Vin: 24VDC)
Notes:
1. The backup time may be reduced if a fixed power load
(such as a DC-DC converter) is connected.
2. If the input voltage increases, the output voltage for the
backup operation will also increase, reducing the backup
time due to the higher power consumption of the load.
■ Serial Connection
Two Blocks cannot be connected in series to increase the
output voltage to 48V or to create positive and negative
outputs.
■ Parallel Operation Connection
The output current and backup time for the backup operation
can be increased by connecting Blocks in parallel.
Standard number of Blocks for parallel operation:2
Maximum number of Blocks for parallel operation:4
·Output Ratings
1 unit ; 22.5V 2.5A
2 units in parallel ; 22.5V 5.0A
3 units in parallel ; 22.5V 7.5A
4 units in parallel ; 22.5V 10A
The backup time will be greatly reduced if three or more
Blocks are connected in parallel and the output current for
the backup operation exceeds 5A. Refer to the graphs in the
catolog for details on the backup time during parallel
operation.
Note:
Although the number of Blocks that can be connected when
using the S8TS-06024 □ is five when calculated from the
current capacity of the Bus Line Connector, only a maximum
of four S8T-DCBU-02 can actually be connected in parallel.
■
Using the Bus Line Connector
·
S8T-BUS03
Fig.15
When connecting to the S8TS-06024
□
, always use
the S8T-BUS03 Bus Line Connector. This Connected
connects only the DC lines. It does not connect AC
lines.
S8T-BUS03 is equipped with a selector for the
prevention of erroneous connection of a different
output voltage specification of the power supply unit.
Slide the selector in the 24V position.
·
Disconnection of Bus line connector
Fig.16
Insert a flat tip screwdriver at each end of the Bus line
connector alternately to remove.
■ Relation between the Momentary Power Failure Time
and the Backup Time
The relation between the momentary power failure time
and the backup time required to compensate the failure is
differed as shown in the following figure. Construct the
system so as to secure the following backup time for
setting the product.
Fig.17
AC Input
Momentary Power Failure Time
I/O Terminal
Voltage
Output Hold Time of
Power Supply
Restart time of
Power Supply
Backup Time
(Required Backup Time)
=(Momentary Power Failure Time)+
(Restart Time)-(Output Hold Time)
■
Checking Operation • Periodic Inspection Method
After connecting the Blocks, check the Buffer Block using
the following procedure to confirm that it operates correctly
for momentary power failures on the AC input. Use this
procedure for maintenance as well.
Notes:
1. Remove the cause of the overvoltage before turn the
input power supply badk ON.
2. The backup operation will not be performed when the
overvoltage circuit operates to shut OFF the output.
■
READY Operation(Indication•Output)
The READY indicator and READY output will function as
shown below after the internal capacitor is completely
charged and the Block is ready to perform the backup
operation. Up to 60 seconds is required for the capacitor to
charge completely.
·
LED(
⑤
,READY: green)ON
·
Relay(READY
①
–
②
: open)
The following status will occur if there is an error in the
charge voltage of the internal capacitor or the output
voltage of the S8T-DCBU-02.
·
LED(
⑤
,READY: green)OFF
·
Relay(READY
①
–
②
: Closed)
The backup operation will not be sufficient or will fail under
the above status. If this status occurs, immediately remove
the cause of the error, such as the following causes.
(1)The connected DC voltage is 23V or less.
(2)The terminals have been connected in reverse or wiring
is otherwise not correct.
(3)The overvoltage protection circuit has oprrated.
(4)The overcurrent protection circuit of the connected
power supply has operated.
Note:
The contact capacity of the output relay is 0.1A at 24VDC.
■
Backup Operation(Indication•Output)
The S8T-DCBU-02 will switch to the backup operation if a
voltage drop is detected on the connected power supply.
·
LED(
⑥
,BACKUP: red)ON
·
Relay(BACKUP
③
–
④:
Closed)
When the backup operation functions, the energy in the
internal capacitor will be discharged to the load. When the
voltage of the power supply then recobers, the S8T-DCBU-
02 will start charging the capacitor. Up to 60 seconds is
required to charge the capacitor completely. The backup
operation may therefore not function for the required period
if the backup operation starts while the capacitor is being
charged.
The following are examples in which the backup operation
may not be sufficient.
(1)The backup operation starts within 60 seconds after
turning ON the power supply.
(2)The backup operation is started consecutively within 60
seconds of the previous backup operation.
(3)A rapid change in the load or other factor causes the DC
voltage to drop, resulting in the backup operation, and
then the backup operation occurs again within 60
seconds.
The READY indicator and READY output will function as
shown below when the internal capacitor is being
charged.
·
LED(
⑤
,READY:green)OFF
·
Relay(READY
①
–
②:
Closed)
Notes:
1. The contact capacity of the output relay is 0.1A at
24VDC.
2. The backup operation may be repeatedly performed if
the connected power supply is overloaded. Remove the
cause of the overload immediately.
3. The backup operation does not detect drops in the AC
input.
(1)Turn ON the AC power supply that has been
connected.
(2)Check the Ready indicator on the S8T-DCBU-02 to
confirm that it is lit.
·
LED(
⑤
,READY: green)ON
·
Relay(READY
①
–
②
:open)
(Up to 60 seconds is required to charge the internal
capasitor before the indicator lights.)
(3)Use a timer and create a momentary power failure on
the AC input of the expected length of time.
Considering variations in characteristics, using 140% or
more of the power failure time is recommended.
Fig.18
(4)Check to confirm that the expected backup operation
was performed. The operation of the BACKUP indicator
and BACKUP output should be as shown below during
the backup operation. Check these as well.
·
LED(
⑥
,BACKUP: red)ON
·
Relay(BACKUP
③
–
④
: closed)
Note:
Check the backup operation under conditions that are
safe and will cause no problems if the backup operation
fails.
■
Dielectric Strength Test
Both the ground terminal (
⑨
) and I/O terminals (
⑩
,
)
are designed so as to be endurable for 1000VAC for 1
minute. When testing, set the cutoff current for the
withstand voltagetest device to 20mA.
Notes:
1.
Increase / decrease test voltage gradually. Sudden
switching of 1000VAC may cause a voltage surge,
damaging the power supply.
2. Be sure that all terminals are short-circuited for
protecting I/O terminals and signal output terminal from
breakage.
■
Insulation Resistance Test
When testing the insulation resistance of the power
supply, use a DC ohmmeter at 500VDC.
Note:
Be sure that all terminals are short-circuited for protecting
I/O terminals and signal output terminal from breakage.
■
Reverse Connection Protection
The S8T-DCBU-02 will be protected even if the positive
and negative I/O terminals are connected in reverse.
■
Overload rotection
The load and the power supply are automatically
protected from overcurrent damage by this function.
Overload protection is activated at an overcurrent
detection point of 5.8 to 6.8A.
When the output current returns within the rated range,
overload protection is automatically cleared.
Note:
Continuation of operation in the overcurrent status may
cause deterioration or breakage of internal elements.
■ Overvoltage Protection
If a voltage that is higher than the specified input voltage
is input or the output voltage exceeds the specified
voltage, the overvoltage protection circuit will operate at
between
31 and 36V to shut OFF the output voltage of the
S8T-DCBU-02 and protect the load from damage due to
overvoltages.
To restore operation, turn OFF the input power supply for
1 minute or longer and then turn it back ON.
Precautions for Safe Use
Load current
1
2
3
4
Recommended wire diameter
Number of connected
S8T-DCBU-02
Up to 10A
Up to 7.5A
Up to 5.0A
Up to 2.5A
I/O Terminals: Connect maximum two wires, AWG14 to 20, same size and
type only to each field wiring terminal .
AWG14 to 18
(Cross-sectional area: 0.823 to 2.081 mm
2
)
AWG14 to 20 (Cross-sectional area: 0.517 to 2.081 mm
2
)
AWG14 (Cross-sectional area: 2.081 mm
2
)
AWG14 to 16 (Cross-sectional area: 1.309 to 2.081 mm
2
)
Signal output terminals:
Solid wire AMG16 to 26 (Cross-sectional area: 0.129 to 1.309 mm )
Stranded wire AMG16 to 24 (Cross-sectional area: 0.205 to 1.309 mm )
5．
Do not apply a force greater than 100 N to the terminal block when
tightening the terminals.
6．
Be sure to remove the sheets covering the S8T-DCBU-02 before turning
ON the power supply and confirm that nothing is interfering with heat
dissipation.
（４）
Settin
g/Mount
ing
1
．
The internal parts may occasionally deteriorate or be broken due to
adverse heat radiation. Operate the S8T-DCBU-02 only under the
specified conditions.
2
．
Ensure sufficient heat dissipation when installing the Product to increase
its long-term reliability.
3
．
Install the Product so that a natural airflow occurs around it.
（５）
Precautions in Using
1
．
After connecting the devices to the S8T-DCBU-02, check whether
sufficient backup is performed correctly by operating the S8T-DCBU-02.
2
．
Check the load current using the actual system in advance to confirm
that there is sufficient leeway in the backup time.
3
．
Check to confirm that the READY indicator and the output function
correctly. The backup operation may not be sufficient if the READY
indicator and output do not function correctly.
4
．
The S8T-DCBU-02 will perform the backup operation not only for
instantaneous power interruptions or voltage drops, but also when the
power supply is OFF. The backup time is particularly long for light loads.
Check the devices connected to the S8T-DCBU-02 to be sure it has
stopped operation correctly.
（６）
Periodic Inspection and Periodic Replacement
The S8T-DCBU-02 contains built-in electrolytic capacitors, which has a
limited life. Perform periodic inspection and replacement. The
performance of the electrolytic capacitor will deteriorate as the total
operating time increases, eventually leading to insufficient performance.
Refer to the following guidelines for periodic replacement.
Ambient
temperature
Up to 30℃
40℃
50℃
60℃
With Spacer
15 years
12 years
6 years
3 years
Connected to S8TS
15 years
8.5 years
5.5 years (See note.)
―
Guideline of replacement
Note: The load ratio of the S8TS is limited to 60%.
Fig.5
Fig.6
（７）
Handling the Bus Line Connector
1
．
Do not drop the Bus Line Connector or subject it to strong shock.
2
．
Do not connect and disconnect the Bus Line Connector more than 20
times. Also, do not touch the terminals on the Bus Line Connector.
Connection failure may cause deterioration of electric performance.
（８） The temperature shall not exceed the lowest temperature ratings of both
the connected power supply and the S8T-DCBU-02.
（９） See product catalogue for details.
～
+V
-V
+V
-V
L N
S8TS-
06024
S8T-
DCBU
+V
-V
L N
S8TS-
06024
S8T-DCBU-02
～
+
+V
-V
+V
-V
S8T-
DCBU
+V
-V
L N
S8T-
DCBU
S8TS-
06024
S8T-DCBU-02
～
+V
-V
+V
-V
L N
S8TS-
06024
S8T-
DCBU
L N
S8TS-
06024
+V
-V
S8T-DCBU-02
Fig. 6
Fig. 4
Fig. 5
Fig.11
Fig. 9
Fig. 8
Fig. 7
Fig. 3
＊
2
＊
3
＊
4
＊
1
＊
1
＊
2
＊
3
＊
4
＊
1
＊
1
＊
1
＊
1
S8TS-06024
S8T-DCBU-02
～
+V
-V
L N
S8TS-
06024
S8T-
DCBU-
02
+V
-V
S8TS-06024
Fig.12
～
+V
-V
L N
S8TS-
06024
S8T-
DCBU-
02
+V
-V
S8TS-06024
Fig.13
Fig.10
Fig.18
～
S8T-
DCBU-
02
+V
-V
S8VS Series, S82K Series,
S82J Series, S8PS Series
～
S8T-
DCBU-
02
+V
-V
S8VS Series, S82K Series,
S82J Series, S8PS Series
～
S8T-
DCBU-
02
+V
-V
Standard mounting
Horizontal mounting (face up)
Mounting
Wiring Method
Operation Check
• Periodic Inspection Method
Connecting to the S8TS-06024
□
According to UL508
To comply with UL508 (Class2:per UL1310), Meet all of following conditions.
·
Class 2 output rating - 24 VDC, 2.5 A
·
Connection to a single S8TS-06024
□
·
Connection of single S8T-DCBU-02
Fig.14
＊1
＊2 ＊3
＊4
0.1
1
10
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
Backup Time (S)
Load current (A)
Backup Time
Selector
Fig.15
Switching of Selector
Fig.16
Disconnecting Bus Line Connector
Conformance to EU Directives
Refer to the catalogue and this instruction manual for details on the operating
condition for EMC-compliance.
15
8
Connector cover
Bus line connector
S8T-BUS03(Order separately)
S8TS-06024
□
Order separately
S8T-DCBU-02
8 Slider
Slider
PARALELL
17
18
19
20
16 Selector
S8T-BUS03
Ground
Bus line
connector
terminals.
Not Connected
DC(+V)
DC(-V)
Connection with S8TS-06024 □
Connection at parallel connection
operation
１２０
４
３５
８０
．７
２
．５
５
４３
５
．６
１２
０
１05
Max. 15 at sliding
BACKUP Output
(BACK UP:
NC Contact
)
READY Output
(
READY: NC Contact
)
READY indicator
(
READY
:
GRN
)
Rail stopper
Ground terminal
Slider
Not Connected
1
2
3
4
7
I/O terminal (+V)
11
5
BACKUP indicator
(
BACK UP
:
RED
)
6
9
12
8
I/O terminal (－V)
10
Terminal cover
Connecting part of
Bus line connector
13
14
Fig.19
Internal capacitor Voltage
I/O terminal voltage
AC Input
S8T-DCBU-02
Output Current
READY Output/LED
（①
–
②）
BACKUP Output
（③
–
④）
BACKUP LED
Charging Time
Start Up
■Time Charts
Internal capacitor Voltage
I/O terminal voltage
AC Input
S8T-DCBU-02
Output Current
READY Output/LED
（①
–
②）
BACKUP Output
（③
–
④）
BACKUP LED
y
l
p
p
u
S
r
e
w
o
P
f
o
e
m
i
T
t
r
a
t
s
e
R
y
l
p
p
u
S
r
e
w
o
P
f
o
e
m
i
T
d
l
o
H
t
u
p
t
u
O
Momentary Power Failure or Voltage Drop
Backup Time
Internal capacitor Voltage
I/O terminal voltage
AC Input
S8T-DCBU-02
Output Current
READY Output/LED
（①
–
②）
BACKUP Output
（③
–
④）
BACKUP LED
Backup Time
2 sec (typ)
Power Supply Interrupted or Stopped
Timer
Contact address
OMRON Corporation
Shiokoji Horikawa, Shimogyo-ku,
Kyoto, 600-8530 Japan
OMRON ELECTRONICS LLC
Phone: 1-847-843-7900
OMRON CANADA INC.
Phone: 1-416-286-6465
UNITED KINGDOM
OMRON ELECTRONICS LTD.
Phone: 44-1908-258-258
Europe/Middle East Asia/Africa/Russia
OMRON Europe B.V.
Wegalaan 67-69, 2132 JD Hoofddorp,
The Netherlands
Phone : 31-23-56-81-300
Fax : 31-23-56-81-388
Web site : www.eu.omron.com
GERMANY
OMRON ELECTRONICS G.m.b.H.
Phone: 49-2173-6800-0
FRANCE
OMRON ELECTRONICS S.A.S.
Phone: 0-825-825-679
ITALY
OMRON ELECTRONICS S.P.A.
Phone : 39-02-32681
SPAIN
OMRON ELECTRONICS IBERIA S.A.U.
Phone : 34-913-777-900
中国
欧姆 自 化（中国）有限公司
Phone:
（
86
）
21-6023-0333
香港
欧姆龍（香港）自動化有限公司
Phone: 852-2375-3827
台灣
台灣歐姆龍股 有限公司
Phone: 886-2-2715-3331
韓国
OMRON Electronics Korea Co., Ltd.
Phone: 82-2-519-3988
AUSTRALIA
OMRON ELECTRONICS PTY.LTD.
Phone: 61-2-9878-6377
SINGAPORE
OMRON ELECTRONICS PTE.LTD.
Phone: 65-6-547-6789
19
20
11
11
2
2
(wires to be stripped : 11 mm)
CAUTION
•
CAUTION : FOR USE IN A CONTROLLED ENVIRONMENT.REFER TO MANUAL
FOR ENVIRONMENTAL CONDITIONS.
•
ATTENTION : POUR UTILISATION EN ATMOSPHÈRE CONTRÔLÉE. CONSULTER
LA NOTICE TECHNIQUE.
Prenez soin de ne pas laisser un connecteur de bus ouvert installé dans le module
d'extrémité.
Ｓｅｅ ｉｎｓｔｒｕｃｔｉｏｎｓ ｆｏｒ
ｃｏｎｎｅｃｔｉｏｎ ｒｅｑｕｉｒｅｍｅｎｔｓ．
