Omron S8m User 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

• Simplesettingofcurrenttrippingvaluesforeachbranchoutputs

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 Legend

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.

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.

2Digital Multicircuit Protector S8M

Specifications

■Ratings/Characteristics

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

Number of branches 4

I/O

character-

istics

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

consump-

tion

(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 operation 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 out-

put Transistor output

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

Alarms Overvoltage 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 Settingrange: 0.5 to 3.8 A (in0.1-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 period 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 MΩmin. (between all charged sections and all non-charged sections) at 500 VDC

100 MΩmin. (between all I/O and I/O signals/communications) at 500 VDC

100 MΩmin. (between all I/O signals and communications) at 500 VDC

100 MΩmin. (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/s2, 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

4Digital Multicircuit Protector S8M

Connections

■Block Diagrams

DC branch output 4

−V

DC branch output 3

−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

Communi-

cations

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

−V

DC branch output 1

−V

Tripping alarm

output

Alarm output

Over-

temperature

output

External

tripping input

DC input

power supply

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

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-segmentDisplay

(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 different 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.)

6Digital 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 Ain 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

120

100

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.

100

Time (ms)

Current

(

)

Characteristics when steady

Current limited by

internal circuit

Tripping region

Setting

range

120.5

Characteristics when steady

Current limited by

internal circuit

Tripping region

Setting

range

3.8

100

Time (ms)

Current

(

)

0.5

Characteristics when steady

Current limited b

internal circuit

Setting

range

Tripping region

Time (ms)

4Current (A)

120.5

3.8 120.5

Characteristics when steady

Current limited b

internal circuit

Setting

range

Tripping region

Time (ms)

Current

(

)

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

Standard 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

8Digital 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 value flows for 80 msor 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.)

Tripping by external 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)

24 V (Rated)

Alarm display

Tripping alarm output

(See note.)

Reset

Alarm output

(See note.)

(Fixed)

(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

ON and turns OFF when an alarm is detected.

(Settable)

4.0 A

(Abnormal current tripping)

3.5 A

(Overcurrent alarm)

3.0 A

(Normal current)

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.

Digital Multicircuit Protector S8M 9

■Alarm Functions

Note: 1. Branch outputs are not cut off for the alarm functions.

2. 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 3: Operation Timing Chart 4: Operation Timing

Function Operation

Overvoltage alarm

(Refer to Chart 1.)

(See notes 1 and 2.)

The voltage is monitored and notification is provided using the alarm display and output (ALM) if the preset

voltage is exceeded for more than 100 ms. The alarm display will alternate between the voltage and the alarm

code (A20). The primary voltage is measured at the input terminals.

Overvoltage alarm setting range: 20.0 to 28.8 V in 0.1-V units.

(Refer to page 14 for the setting procedure.)

Overcurrent alarm

(Refer to Chart 2.)

(See note 1.)

Each branch output current is monitored and notification is provided using the alarm display and output (ALM) if

the preset value is reached.

The alarm display will alternate between the current and the alarm code (A22).

Overcurrent alarm 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 tripping types can be set.

Standard detection: An alarm is output if the current exceeds the set value for 80 ms or longer.

Instantaneous detection: An alarm is output if the current exceeds the set value for 10 ms or longer.

(Refer to page 14 for the setting procedure.)

Undervoltage alarm

(Refer to Chart 1.)

(See notes 1 and 2.)

The voltage is monitored and notification is provided using the alarm display and output (ALM) if the voltage drops

below the preset voltage for more than 80 ms. The alarm display will alternate between the voltage and the alarm

code (A21). The primary voltage is measured at the input terminals.

Undervoltage alarm setting range: 18.0 to 26.4 V in 0.1-V units.

(Refer to page 14 for the setting procedure.)

Run time alarm

(Refer to Chart 3.)

(See note 1.)

The time that the power is turned ON is calculated as the S8M run time and notification is provided using the

alarm display and output (ALM) if the preset time is reached. The alarm display will alternate between the run

time and the alarm code (A23).

Display range: 0.0 to 99.9 kh in 0.1-kh units.

Run time setting range: 0.0 to 99.9 kh in 0.1-kh units.

(Refer to page 14 for the setting procedure.)

Over-temperature output

(Refer to Chart 4.)

(See note 1.)

The internal temperature of the S8M is monitored using a built-in temperature sensor and notification is provided

using the alarm display and over-temperature output (TMP) if the preset temperature is exceeded for more than

1 s. The alarm display will alternate between the temperature and the alarm code (A30). The over-temperature

output is convenient for control operations, such as operating a cooling fan to suppress temperature increased in

the control panel.

Note: The alarm display and over-temperature output are automatically cleared if the temperature falls below the

set temperature.

Display range: −10 to 100°C in 1°C units.

Temperature setting range: 25 to 80°C in 1°C units.

(Refer to page 14 for the setting procedure.)

(Settable

)

Run time

50.0 kh

Note: The alarm output is a transistor output. It is normally ON and

turns OFF when an alarm is detected.

Power ON

Alarm display

Alarm output

(See note.)

Run time cleared

A23

(Settable)

Temperature

50°C

Alarm display

Over-temperature

output (See note.)

A30 A30 A30

Note: The alarm display and over-temperature output are automatically cleared (with

hysteresis). (Refer to page 16.) The over-temperature output is a transistor output.

It is normall

ON and turns OFF when an alarm is detected.

10 Digital Multicircuit Protector S8M

■Other Functions

Note: The sequencing functions are designed forthe four branch outputs of one S8M. There is no sync processing between S8M Protectors when

more than one S8M is used.

Chart 5: Operation Timing Chart 6: Operation Timing

Function Operation

Startup sequence

(Refer to Chart 5.) The connection timing for branch outputs 1 to 4 can be set individually to offset the connection timing of load

devices. Creating time delays between starting loads enables safe load operation. It also reduces total inrush

current so that power supply capacity can be optimized.

Setting range: 0.0 to 99.0 s in 0.1-s units. (See note.)

(Refer to page 14 for the setting procedure.)

Shutdown sequence

(Refer to Chart 6.) The cutoff timing for branch outputs 1 to 4 can be set individually to offset the cutoff timing of load devices for the

external tipping input or to enable an emergency stop.

Setting range: 0.0 to 99.0 s in 0.1-s units. (See note.)

(Refer to page 14 for the setting procedure.)

Startup delay A delay function is provided so that the abnormal current tripping

function or overcurrent alarm function will not be triggered by large

initial surge currents, e.g., for capacitive loads or lamp loads. The

abnormal current tripping function will function once the set time has

elapsed.

(Note: The delay is fixed at 70 ms.)

Current

70 ms: Delay

Alarm function disabled

for large surge currents

at startup.

Power supply voltage

Startup sequence time

Self-diagnosis

(0.5 s min.)

Branch output 1 voltage

Branch output 2 voltage

Branch output 3 voltage

Branch output 4 voltage

Shutdown sequence time

Within 20 ms

External tripping input

Branch output 1 voltage

Branch output 2 voltage

Branch output 3 voltage

Branch output 4 voltage

Note: Tripping operation is simultaneous for tripping made for

abnormal volta

es (28.8 V or hi

her).

Digital Multicircuit Protector S8M 11

■Key Operations and Displays in Each Mode

Input Voltage

Display

Run Mode

Mode Selection

Run Mode Setting Mode Test Mode Protection Level Parameter Initialization

Level Selection Yes, initialize.

Output Current

Display

(See note.)

Peak Output

Current Display Clearing selected

peak output current.

Or no key operation for

more than 3 s.

Or no key operation for

more than 5 s.

Or no key operation for

more than 3 s.

Press for 3 s.

Press for 3 s. Press for 3 s.

Press for 3 s.

Total Current

Display

Run Time Display

Temperature

Display

Abnormal Current

Tripping Value

Abnormal Current

Tripping Type

Overcurrent

Alarm Value

Overcurrent

Alarm Type

Undervoltage

Alarm Value

Setting Mode

Power ON

(See note.)

Standard/

Instantaneous

Value Setting