Omron S8M-CP04, S8M-CP04-R, S8M-CP04-RS Product Manual

Digital Multicircuit Protector S8M 1

Digital Multicircuit Protector

S8M

Complete Flexible DC Circuit Protector That
Has a Wide Array of Displays, Alarm
Outputs, and Other Digital Functions.

• Four circuit protectors in one package

• Simple setting of curr ent tripping values for each bra nch outputs
in 0.1-A units

• Startup and shutdown sequence control

• Display and alarm functions (Input voltage, output current,
run time, and over-temperature)

• Outputs conform to UL Class 2 (at 24 VDC, S8M-CP04-RS
only)

• DIN Rail mounting

• Free Support Tool available

Note: Refer to Precautions for Safe Use on page 20.

Model Number Structure

■Model Number Lege nd

Note: Not all combinations are possible. Please refer to the list of models in Ordering Information below.

1. Communications

None: Not supported
R: Supported (RS-232)

2. UL Class 2 Output (at 24 VDC)

None: Not compliant
S: Compliant

Ordering Information

Note: For details on normal stock models, contact your nearest

OMRON representative.

Recommended Power Supplies

Note: When selecting the power supply , be sure to include the

internal power consumption of the S8M (approx. 10 W) and not
just the power consumption of the load.

12

S8M-CP04- @@

Communications UL Class 2 output Model number

None Not compliant S8M-CP04
Supported (RS-232C) Not compliant S8M-CP04-R

Compliant S8M-CP04-RS

Series name Model number

S8VS S8VS-06024@@

S8VS-09024@@
S8VS-12024@@
S8VS-18024@@
S8VS-24024@@

S8VM S8VM-05024@@

S8VM-10024@@
S8VM-15024@@
S8VM-30024C
S8VM-60024C

This Datasheet describes only the minimum setting operations required when using the S8M for the first time.
Refer to the S8M User's Manual (Cat. No. Z241), when making further settings.

2 Digital Multicircuit Protector S8M

Specifications

■Ratings/Characteristics

Item Model S8M-CP04 S8M-CP04-R S8M-CP04-RS
Number of branches 4
I/O

character­istics

Rated input voltage 24 VDC (19.2 to 26.4 VDC)
Allowable input current 17.0 A max. 16.0 A max.
Maximum tripping output current

(per branch output)

4.0 A 3.8 A

Internal voltage drop (See note 1.) 0.5 VDC max. (at 4.0 A) 0.7 VDC max. (at 3.8 A)
Output leakage current 10 mA max.
Power

consump­tion
(See note 2.)

4 branches output,
normal operation

10 W max. (at 4.0 A) 15 W max. (at 3.8 A)

4 branches output,
tripping operati on

3 W max.

Functions Tripping Abnormal voltage

tripping

28.8 V (fixed), tripping alarm output

Abnormal current
tripping

Setting range: 0.5 to 4.0 A (in 0.1-A units), tripping alarm
output

Setting range: 0.5 to 3.8 A (in 0.1-A
units), tripping alarm output

Tripping alarm out­put

Transistor output
30 VDC max., 50 mA max., leakage current: 0.1 mA max., residual voltage: 2 V max.

Alarms Ove rvoltage Setting range: 20.0 to 28.8 V (in 0.1-V units), alarm output

Undervoltage Setting range: 18.0 to 26.4 V (in 0.1-V units), alarm output
Overcurrent Setting range: 0.5 to 4.0 A (in 0.1-A units), alarm output Setting range: 0.5 to 3.8 A (in 0.1-A

units), alarm output

Run time Setting range: 0.0 to 99.9 kh (in 0.1-kh units), alarm output

(The alarm output is disabled if the time is set to 0.0 kh.)

Alarm output Transistor output

30 VDC max., 50 mA max., leakage current: 0.1 mA max., residual voltage: 2 V max.

Temperature Temperature Setting range: 25 to 80

°C, over-temperature output

Over-temperature
output

Transistor output
30 VDC max., 50 mA max., leakage current: 0.1 mA max., residual voltage: 2 V max.

Display Input voltage Display range: 17.0 to 30.0 V

Display accuracy: 2% rdg

±1 digit max.

Output current Branch output display range: 0.0 to 4.0 A

Peak output current display range:0.0 to 10.0 A
Total current display range: 0.0 to 40.0 A
Display accuracy: 5% FS (4 A)

±1 digit max.

Run time Display range: 0.0 to 99.9 kh

Display accuracy: 2% rdg

±1 digit max.

Temperature Display range:

−10 to 100°C

Display accuracy: 2

°C ±1 digit max.

External tripping input 19.2 to 30 VDC, minimum signal width: 10 ms, tripping within 20 ms of input
Startup sequence Can be enabled/disabled for each branch output, setting range: 0.0 to 99.9 s in 0.1-s units.
Shutdown sequence Can be enabled/disabled for each branch output, setting range: 0.0 to 99.9 s in 0.1-s units.
Communications None Supported (RS-232C)
Sampling pe r i od 1 ms

Digital Multicircuit Protector S8M 3

Note: 1. A voltage drop will occur in the S8M. Consider the voltage drop at the output.

2. When selecting the power supply, be sure to include the internal power consumption of the S8M (approx. 10 W) and not just the power

consumption of the load.

3. Refer to Engineering Data on page 6 for details.

Other Ambient operating temperature Refer to the derating curve in Engineering Data (with no condensation or icing) (See note 3.)

Storage temperature

−25 to 65°C

Ambient operating humidity 25% to 85% (storage humidity: 25% to 90%)
Dielectric strength 1.0 kVAC for 1 min (between all charged sections and all non-charged sections; detection cur-

rent: 20 mA)
500 VAC for 1 min (between all I/O and I/O signals/communications; detection current: 20 mA)
500 VAC for 1 min (between all I/O signals and communications; detection current: 20 mA)
500 VAC for 1 min (between input signals and all output signals; detection current: 20 mA)

Insulation resistance 100 M

Ω min. (between all charged sections and all non-charged sections) at 500 VDC

100 M

Ω min. (between all I/O and I/O signals/communications) at 500 VDC

100 M

Ω min. (between all I/O signals and communications) at 500 VDC

100 M

Ω min. (between input signals and all output signals) at 500 VDC

Vibration resistance 10 to 55 Hz, 0.375-mm single amplitude for 2 h each in X, Y, and Z directions
Shock resistance

150 m/s

2

, 3 times each in ±X, ±Y, and ±Z directions

EMI Conducted

Emission

Conforms to EN 61204-3 Class B

Radiated Emission Conforms to EN 61204-3 Class B
EMS Conforms to EN 61204-3 High severity levels
Approved standards UL: UL 508 (Listing), UL 60950-1

cUL: CSA C22.2 No. 107.1
cUR: CSA No. 60950-1
EN/VDE:EN 50178 (= VDE 0160), EN 60950-1

(= VDE 0805 Teil 1)

UL: UL 508 (Listing, Class 2:

Per UL 1310), UL60950-1
cUL: CSA C22.2 No. 107.1
cUR: CSA No. 60950-1
EN/VDE:EN 50178

(= VDE 0160),

EN 60950-1

(= VDE 0805 Teil 1)

Weight 400 g max.

Item Model S8M-CP04 S8M-CP04-R S8M-CP04-RS

4 Digital Multicircuit Protector S8M

Connections

■Block Diagrams

DC branch output 4

−V

+V

DC branch output 3

−V

+V

DC branch output 2

Fuse

Cutoff
circuit

Current-detection

resistor

Cutoff
circuit

Cutoff
circuit

Voltage

detection

S8M-CP04-R/-RS only

Power supply

circuit

Communications

circuit

Communi­cations
terminals
RS-232C

Display

circuit

Switch

Processing

circuit

Temperature

detection

Current-detection

resistor

Current-detection

resistor

Cutoff
circuit

Thermal

fuse

Thermal

fuse

Current-detection

resistor

Cutoff
circuit

Current-detection

resistor

Cutoff
circuit

Thermal

fuse

Current-

limiting

circuit

Current-

limiting

circuit

Current-

limiting

circuit

Current-

limiting

circuit

Current-detection

resistor

Cutoff
circuit

Current-detection

resistor

Cutoff
circuit

Thermal

fuse

Fuse

Fuse

Fuse

−V

+V

DC branch output 1

−V

+V

+V

−V

Tripping alarm
output

Alarm output

Over­temperature
output

External
tripping input

DC input
power supply

SD
RD
SG

S8M-CP04-RS only

Current-detection

resistor

Digital Multicircuit Protector S8M 5

Construction and Nomenclature

■Nomenclature

Note: 1. For detailed display methods, refer to Status Indicators on

page 13.

2. Configured from independent circuits, and either sinking or
sourcing applications are possible.

3. Indicators 1 to 4 will not light except when the current is
being displayed.

4. Press for at least 3 s to enable operation.

5. Except for the S8M-CP04.

4 5 6 7

1

14

10
11

3

8

9
13
12

2

4 Tripping alarm output (TRP)

5 Alarm output (ALM)

6 Over-temperature output (TMP)

7 External tripping input (TRG)

Internal circuit configuration

Note: The S8M-CP04-RS is shown above.

No. Name Function

1 Power Input Terminals

(+V), (

−V)

Connect to the input line.

2 Branch Output

Terminals (+V), (

−V)

Connect to the load lines.
Up to four branch outputs can be
connected.

3 Status Indicators

(Red, Green)

Indicate the connection and cutoff
status for each branch output.
Cut off: Red, Connected: Green (See
note 1.)

4 Tripping Alarm Output

(+,

−)

Output (transistor: OFF) when the
error tripping operation functions.
(See note 2.)

5 Alarm Output (+,

−) Output (transistor: OFF) when a set

value for alarm detection is exceeded.
(See note 2.)

6 Over-temperature

Output (+,

−)

Output (transistor: OFF) when a set
value for over-temperature detection
is exceeded. (See note 2.)

7 External Tripping Input

(+,

−)

The tripping operation can be
executed with an externally input
signal.

8 Seven-segment Display

(Red)

Displays measured values and set
values.

9 Unit Indicators

(Orange)

V Lit when the input voltage is being

displayed.

A Lit when the output current is being

displayed.
Flashes when the peak output current
is being displayed.

kh Lit when the run time is being

displayed.

°C Lit when the temperature is being

displayed.
s Lit when setting the sequence time.
1 to 4 Lit or flashing when displaying branch

output information. (See note 3.)

10 Mode Key Used to change the parameter being

displayed or to reset the peak hold

current value.

11 Up Key Used to move to diff erent setting

modes or to increase a set value.

12 Down Key Used to move to different setting

modes or to decrease a set value.

13 Reset Key (RST) Used when connecting branch

outputs for tripping operation. (See

note 4.)

14 Communications

Terminals (RD, SD, SG)

Connect to the communications lines

(RS-232C). (See note 5.)

6 Digital Multicircuit Protector S8M

Engineering Data

■Derating Curve

Note: 1. Internal parts may occasionally be deteriorated or damaged. Do not use the S8M in areas outside the derating curve (i.e., in the area

shown by shading A in the above graph).

2. If there is a derating problem, use forced air cooling.

■Abnormal Current Tripping

Standard Detection

S8M-CP04/S8M-CP04-R S8M-CP04-RS

Instantaneous Detection

S8M-CP04/S8M-CP04-R S8M-CP04-RS

1

120

100

80

60

40

20

0

−100 10203040 6050 70−20
Ambient temperature (°C)

Maximum applied current for

any one branch output (%)

S8M-CP04, S8M-CP04-R: Maximum output current 4.0 A
S8M-CP04-RS: Maximum output current 3.8 A

Derating Curve of the S8M

The ambient temperature that S8M can be
operating is limited by the maximum output
current of one branch terminal on ordinary
current condition.

4

100

Time (ms)

Current

(A)

Characteristics when steady

Current limited by
internal circuit

Tripping region

Setting

range

6

20

120.5

Characteristics when steady

Current limited by
internal circuit

Tripping region

Setting

range

3.8

100

Time (ms)

Current

(A)

6

20

12

0.5

Characteristics when steady

Current limited b

y

internal circuit

Setting

range

Tripping region

Time (ms)

20

4

Current (A)

120.5

20

3.8 120.5

Characteristics when steady

Current limited b

y

internal circuit

Setting

range

Tripping region

Time (ms)

Current

(A)

Digital Multicircuit Protector S8M 7

■Mounting

Note: 1. Improper mounting will interfere with heat dissipation and may occasionally result in deterioration or damage of internal parts.

Do not use any mounting method other than the standard one.

2. Take adequate measures to ensure proper heat dissipation to increase the long-term reliability of the S8M.

3. Install the S8M so that the air flow circulates around it, because the S8M is designed to radiate heat by means of natural air flow.

Functions

■Functions

Standar d Mounting

Correct

Face-up Mounting

Incorrect

Alarm Alarm output Output status Alarm display

Abnormal voltage tripping TRP output: OFF

(normally ON )

All branch outputs cut off. A10

Abnormal current tripping TRP output: OFF

(normally ON )

Relevant branch output cut
off.

A11

Overvoltage alarm ALM output: OFF

(normally ON )

ON A20

Undervoltage alarm ALM output: OFF

(normally ON )

ON A21

Overcurrent alarm ALM output: OFF

(normally ON )

ON A22

Run time alarm ALM output: OFF

(normally ON )

ON A23

Over-temperature output TMP output: OFF

(normally ON )

ON A30

8 Digital Multicircuit Protector S8M

■Tripping Functions

Note: 1. Two abnormal current tripping types are supported depending on the tripping current characteristics: Standard detection and

instantaneous detection. Select the required tripping type.

2. Outputs are cut off using semiconductor relays and electrical insulation is not provided.

3. The output will remain OFF and the alarm display and alarm output will not be cleared even if power is restored. The S8M must be reset

to restore operation. (Refer to List of Alarms on page 16 for details.)

4. The voltage at the power input terminals is monitored to detect abnormal voltages. To confirm correct output voltages, measure the
voltages at the branch output terminals.

Chart 1: Operation Timing Chart 2: Operation Timing

Function Operation

Abnormal voltage tripping
Refer to Chart 1.
(See notes 2, 3 and 4.)

The input voltage is monitored and all branch outputs are cut off if the detection voltage is reached. Notification of the
status is provided using the alarm display and the tripping alarm output (TRP).

The alarm display will alternate between the voltage and the alarm code (A10). The primary voltage is measured at
the input terminals.

Detection voltage: 28.8 V (fixed)

Abnormal current tripping
Refer to Chart 2.
(See notes 2 and 3.)

The output current is monitored and the branch output that is abnormal is cut off if the preset current is reached.
Notification of the status is provided using the alarm display and the tripping alarm output (TRP).

The alarm display will alternate between the current and the alarm code (A11).
Abnormal current detection setting range: 0.5 to 4.0 A (S8M-CP04-RS: 0.5 to 0.38 A) in 0.1-A units.
Either of two abnormal current tripping types can be set.
Standard detection: Tripping within 100 ms. (If a current exceeding the set v alue flo ws for 80 ms or more, it is detected

as an abnormal current and power is cut off within 20 ms.)

Instantaneous detection: Tripping within 20 ms. (If a current exceeding the set value flows for 10 ms or more, it is

detected as an abnormal current and power is cut off within 10 ms.)

(Refer to page 14 for the setting procedure.)

T ripping by e xternal signal
(See note 2.)

The output can be cut off by inputting a voltage to the external tripping input (TRG terminal). If a shutdown sequence
has been set, outputs will be cut off according to the shutdown sequence. (Refer to page 14 for information on the
shutdown sequence.)

External input signal width: 10 ms min.
External tripping enable/disable setting: Enabled
Input signal levels

High level: 19.2 to 30 VDC

Low level: 0 to 2.5 VDC
Tripping can also be performed by using communications (S8M-CP04-R/RS only).
Refer to the S8M User’s Manual (Cat. No. Z241) for information on tripping using communications.

28.8 V (Abnormal voltage tripping)

25 V (Overvoltage alarm)

18 V (Undervoltage alarm)

0

24 V (Rated)

Alarm display

Tripping alarm output
(See note.)

Reset

Alarm output
(See note.)

(Fixed)

(Settable)

(Settable)

100 ms 100 ms

t

A21 A20 A10

20 ms

3 s

Note: The alarm and tripping alarm output are both transistor outputs.

It is normall

y

ON and turns OFF when an alarm is detected.

t

(Settable)

(Settable)

4.0 A

(Abnormal current tripping)

3.5 A

(Overcurrent alarm)

3.0 A

(Normal current)

0

Alarm display

Alarm output
(See note.)

Tripping alarm output
(See note.)

Reset

20 ms

(Instantaneous)

3 s

100 ms

(Standard)

Within 20 ms for instantaneous
detection and 100 ms for standard
detection (depends on tripping type).

A22 A22 A11

Note: The alarm and tripping alarm output are both transistor outputs.

It is normally ON and turns OFF when an alarm is detected.