◆Safety relays are critical components in all safety related control systems, for which the proper functioning will be of great importance in maintaining the safety performance of the safety related control system.Thus when designing safety related control system, one must read this manual and component datasheet carefully to ensure the relay working conditions unconformity with part specifications, and achieving desired performance.For detailed information of component parameters and specifications, see chapter2; ◆The installation, inspection, dismounting of the safety relay and safety related control system must always be performed by skilled persons specially trained for the task. All relevant technical instructions and regulations must be strictly observed. The proper functioning of the component rely on the proper installation. For detailed instruction of component installations, see chapter 6;◆The unit need to be mounted on standardized racks. SR4P3A1B24 is designed for 35mm DIN rail;◆Transport, storage and operating conditions should all conform to EN 60068-2-6(GB/ T 2423.10);◆Never attempt to disassemble the unit for recovering purpose. There are no repairable or adjustable parts inside unit cover. All product guarantee will be invalid for parts with seal or cover purposely broken;◆Additional protection measures required for applications for output contacts with capacitive and inductive loads. Refer to component data sheet for detailed information;◆When permitted, the safety function must be triggered at least once a month . If this is not applicable, there need to be proper program for verifying the safety function.

TYPE SR4P3A1B24 Operating Voltage UB 24V DC Voltage Tolerance -15... +10% Power Consumption 3W Output Contacts 3N/O+1N/C Max Switched AC: AC-15: 5A/250V

Max Switched DC: DC-13: 6A/24V

Max Output Fuse: 4A T/ 6A F

Switch-on delay Automatic reset Manual reset

25ms 25ms

Delay-on De-energization MAX.supply interruption before De-energization

30ms 20ms

Standards

EN 60947-5-1（GB 14048.5） EN 61000-6-2（GB 17626.2） EN 61000-6-3（GB 17626.3） EN ISO 13849-1（GB/T 16855.1） EN 60204-1 （GB 5226.1）

Safety Category Safety Level:EN ISO 13849-1(up to Cat.4/PLe) Safety Integrity Level:EN 62061 (conform SIL3)

Vibration to EN 60068-2-6 Frequency Amplitude

10...55Hz 0.33mm

Climate Suitability EN 60068-2-78 Operating Temperature -10...+55℃ Storage Temperature -40...+85℃ Enclosure Protection IP50 Mounting 35mm DIN rail Max Wire Size 0.2...2.5mm2

Torque setting for screw terminals 0.5Nm Dimensions （mm） 96×22.5×116

Weight 330g

The Safety Relay SR4P3A1B24 can be operated with 24VDC.Feature:◆Relay outputs:3 safety contacts (N/O), 1 auxiliary contact (N/C);◆Connections for Emergency Stop Button, Safety Gate Limit Switch and Reset Button;◆Status indicators;◆Feedback control loop for monitoring of external contactors/relays possible.The relay complies with the following safety requirements:◆The circuit is redundant with built-in self-monitoring;◆The safety function remains effective in the case of a component failure;◆The correct opening and closing of the safety function relays is tested automatically in each on-off cycle.

The safety relay SR4P3A1B24 is designed capable of long terms stable work under temperature up to 55℃, and withstand shor period excessive high temperature, but such extreme working condition will undo ubtedly reduce reliability of the safety relay and many other components as well. Thus we strongly recommend adding suitable cooling fans orair conditioning apparatus to keep temperature inside electrical cabinet where the component installed below 20℃ when there exists high capacity components that generate heats, or any other factors that may reduce the efficiency of cooling. It is also good manners to keep cabinet temperature monitored.

The Safety Relays SR4P3A1B24 is for used in:◆ Emergency Stop circuits ;◆ Safety circuits according to EN 60204-1.

Fig.1 Internal wiring diagram

◆Input circuit closed (e.g. the emergency stop button is not pressed),see Fig.2: Relay K1 and K2 energize and retain themselves. The status indicators for "CH1" and "CH2" illuminate.The N/O(normal open)safety contacts will be （13-14/23-24/33-34）will be closed, the auxiliary N/C(normal close) contact (31-32)opened.◆Input circuit is opened (e.g. emergency stop is pressed ),see Fig.3: Relays K1 and K2 de-energize. The status indicators for "CH1" and "CH2" go out .The N/O safety contacts（13-14/23-24/33-34）will be opened , the auxiliary N/C contact (31-32) will be closed.

Attention:When either of the input channels is opened ,the safety relay will be deactivated, both input channels must be opened before a new reset process may be initialized.

Fig.7 Dual-channel safety gate control, manual reset

Fig.11 Dimensions（mm） Fig.12 Orbital & Slot

a.The unit is designed for 35mm DIN rail, see Fig.12.b. Safety relay installation method. Gently press down, stuck in the track, see Fig.13. If the unit is installed on a vertical mounting rail (35mm), ensure it is secured using a fixing bracket such as end bracket. For detailed information related with component installation and wiring, see chapter 7. To replace a broken parts, the following procedure must be strictly observed:◆Keep all documents and diagrams at hand for reference, otherwise record all wiring connections to avoid wrong connection;◆Cut off machine power supply to ensure no danger voltage inside the machine, except those for service lighting and sockets for tools;◆Loosen the locking screws, release the wires connected to all terminals;◆Pull the reed to release the part from the rack, rotate the part to dismount it from the rack,see Fig.14;◆Mount a new part and connect the wires, check wiring before any power on function test.

Fig.13 Safety relay installation method Fig.14 Removal of safety relay

2. Technical Data

The relay SR4P3A1B24 provide a safety-oriented interruption of a safety circuit. When the operating voltage is supplied, the LED "Power" is illuminated .The unit is ready for operation, when the reset circuit S33-S34 is closed.

4. Function Description

◆Two-channel operation: Redundancy in the input circuit. Earth faults in the emergency stop circuit and short across the emergency stop push button are also detected.◆Automatic reset : Unit is active as soon as the input circuits are closed .See Fig.4.◆Manual reset: Unit is only active when a reset button has been pressed. Automatic activation following a loss/return of supply voltage is thereby prevented. See Fig.5.◆Increase in the number of available contacts by connection of external contactors/relays. See Fig.9 and Fig10.

5. Operating Modes

1.Safety Precaution

3. Unit Description

7. Examples of practical application

The safety relay is an electrical product and may not deposit freely as harmless materials. It must be treated as industrial wastes and dealt with complying with relevant laws and regulations.

11.Decommissioning

Note:

:Switch activated

:gate close

:gate open

S1/S2:Emergency Stop Button ,Safety Gate Limit Switch S3:Reset button

STARTUNIT1

STARTUNIT2

B

Reset◆Close the input circuit；◆For manual reset press the button between S33-S34.

Fig.8 Dual-channel safety gate control, automatic reset

Fig.9 Connection example for external contactors/relays (Single-channel automatic reset)

Fig.10 Connection example for external contactors/relays (Single-channel can be monitored manual reset)

Fig.6 Two-channel input circuit, manual reset

10.Installation & Removal

9.Dimensions

For a practical application of a safety relay, and when there seems to be any problems(frequent open faults in safety circuit or failure in reset, for example), a maintainer must always keep clear mind and take proper operation. He may act following instructions below:◆Indicators(LED’s) There are three indicators on the safety relay, one red, marked with "Power", two green, marked with "CH1" and "CH2".LED "Power" is not illuminated if short-circuit or the supply voltage is lost. Please check the supply voltage. "CH1" and "CH2" are not illuminated if the safety relay pick-up failure. Please Disconnect S1 and S2, restart them or restart the power.◆Earth fault Supply voltage fails and the safety contacts are opened via an electronic fuse. Once the cause of the fault has been removed and operating voltage is switched off, the unit will be ready for operation after approximately 1minute. ◆Contact failure In the case of welded contacts, no further activation is possible following an opening of the input circuit.If these failures can not be excluded please replacement of the same type of safety relay, or contact us.

◆Reset circuit: -Automatic reset: Bridge S33-S34. -Manual reset: Connect the reset button to S33-S34. ◆Input circuit: -Two-channel: Connect N/C contacts from safety switch (e.g. Emergency-Stop) to S11-S33 and S21-S22.◆Feedback control loop: Connect external contactors/relays in series with reset circuit S33-S34. The safety contacts （13-14/23-24/33-34） are activated (closed), the auxiliary contact (41-42) is opened. The status indicators"CH1" and "CH2" are the illuminated. The unit is ready for operation. If the input circuit is (41-42) opened, safety contacts （13-14/23-24/33-34）are opened, and the auxiliary contact is closed. The status indicators go out.

Important notifications:◆To prevent a welding together of the contacts, a fuse (see technical data) will be required in the output channel anytime when there may be risk of overcurrent(including normal working conditions and any foreseeable fault conditions). Such fuse must be installed in the circuit in series without any parts in parallel.◆Calculate the Max.Cable length, runs Imax in the input circuit:

Rlmax=Max. Total cable resistance Rl/km=Cable resistance/km ◆Applications exceeding rated data and specifications listed in chapter 2 is strictly prohibited. Instructions for component wiring: when a component is secured in the rack and ready for wiring, operator need to observe following steps: Connect the operating voltage to terminals "L+" and"L-".

8. Faults diagnosis and Exclude

Rlmax Rl/km lmax=

6. Operation

Fig.4 Automatic reset Fig.5 Manual reset

LOGIC UNIT

S2

S33 S34

S11 S33 S21 S22

LOGIC UNIT

S3

S1 S2

S33 S34

S11 S33 S21 S22

S1

Fig.2 Input circuit is closed Fig.3 Input circuit is opened

LOGIC UNIT

S21 S11 S33 S22

41 13 23

42 14 24 S3

S33 S34

S1

S21 S11 S33 S22

41 13 23

42 14 24 S3

S33 S34

S1

33

34

33

34

LOGIC UNIT

35mm DIN

In Fig.6-Fig.10 are connection examples for Emergency Stop wiring with automatic andmonitored manual reset. Safety gate control as well as contact expansion via externalcontactors. When use "Automatic reset" the device starts automatically after loss of power. You should prevent an unintended start-up by using external circuitry measures.