background image

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 ( 

 , 

 ) 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(

,READY: green)ON

·

Relay(READY

: 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(

,READY: green)OFF

·

Relay(READY

: 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(

,BACKUP: red)ON

·

Relay(BACKUP

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(

,READY:green)OFF

·

Relay(READY

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(

,READY: green)ON

·

Relay(READY

: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(

,BACKUP: red)ON

·

Relay(BACKUP

: 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 (

) and I/O terminals (

,

)

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

 

.5

 

5 

43 

.6

 

12

 

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.

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