◆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. For detailed information of component parameters and specifi cations, 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;◆The unit need to be mounted on standardized racks. SR4P2A1B22/24 are 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 cover adjustable parts inside unit cover. All product guarantee will be invalid for parts with seal or 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 SR4P2A1B24 SR4P2A1B22

Operating Voltage UB 24V DC 85...264V AC/DC

Voltage Tolerance -15...+10% Power Consumption 3W Frequency Range ---- 50...60Hz Output Contacts 2N/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 Or so 1s

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(GB/T 2423.3) Frequency Amplitude

10...55Hz 0.33mm

Climate Suitability EN 60068-2-78(GB/T 2423.3) 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 340g

The Safety Relay SR4P2A1B22 can be operated with 85-264VAC/DC, and SR4P2A1B24 can be operated with 24VDC.Feature:◆Relay outputs:2 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 SR4P2A1B22 and SR4P2A1B24 are designed capable of long terms stable work under temperature up to 55℃, and withstand short period excessive high temperature, but such extreme working condition will undoubtedly reduce reliability of the safety relay and many other components as well. Thus we strongly recommend adding suitable cooling fans or air 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 effi ciency of cooling. It is also good manners to keep cabinet temperature monitored.

The Safety Relays SR4P2A1B22 and SR4P2A1B24 are for used in:◆Emergency Stop circuits;◆Safety circuits according to EN 60204-1 (GB 5226.1);

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 (13-14/23-24)will be closed, the auxiliary N/C(normal close) contact (31-32)will be 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) 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.2 Input circuit is closed Fig.3 Input circuit is opened

Fig.4 Automatic reset Fig.5 Manual reset

◆ 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 specifi cations 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: ①Connect the operating voltage to terminals" A1 (L+)" and" A2 (L-)". ②When operating Voltage 85-264V AC/DC: Connect the operating earth terminal(GND)with the ground earth.◆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-S12 and S21-S22.◆Feedback control loop: Connect external contactors/relays in series with reset circuit S33-S34, see Fig.10. The safety contacts (13-14/23-24) are activated (closed), the auxiliary contact (31-32) is opened. The status indicators "CH1" and "CH2" are the illuminated. The unit is ready for operation. If the input circuit is (31-32) opened, safety contacts (13-14/23-24) are opened, and the auxiliary contact is closed. The status indicators go out.

Fig.6 Two-channel Emergency-Stop input circuit, manual reset

Fig.7 Dual-channel safety gate control (automatic reset )

Fig.8 Dual-channel safety gate control (manual reset)

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

note:

:Switch activated

:Gate close

:Gate open

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

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

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;

◆Wiring 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;

If these failures can not be excluded please replace same type of safety relay, or contact us.

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

b.Safety relay installation method: see Fig.13. If the unit is installed on a vertical mounting rail (35mm), ensure it is secured using a fi xing 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 ;◆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;◆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 SR4P2A1B22 and SR4P2A1B24 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: Dual-circuit power supply, 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 and Fig.7;◆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,Fig.6 and Fig.8;◆Increase in the number of available contacts by connection of external contactors/relays. See Fig.9 and Fig.10.

5. Operating Modes

1. Safety Precaution

3. Unit Description

6. Operation

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.

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

a.The unit is designed for 35mm DIN rail, see Fig.12.

10. Installation & Removal

9. Dimensions

8. Faults diagnosis and Exclusion

L+ L- S34 S33 S11 S12 31

32 24 S22 S21

STARTUNIT2

STARTUNIT1

23 13

14

A1 A2 S34 S33 S11 S12 31

32 24 S22 S21

STARTUNIT2

STARTUNIT1

23 13

14

AC/DC DC

UB=85-264V AC/DCUB=24V DC

Logic Unit

S21 S11 S12 S22

31 13 23

32 14 24 S3

S33 S34

S1

Logic Unit

S21 S11 S12 S22

31 13 23

32 14 24 S3

S33 S34

S1

S2

S33 S34

S11 S12 S21 S22

S3

S1 S2

S33 S34

S11 S12 S21 S22

S1

lmax=Rlmax Rl/km

S12 S22

S11 S21 S33

S34

S3

S1

S33

S34 S22

S21

S12

S11

S1

S2

S33

S34 S22

S21

S12

S11

S1

S2

S3

K4 K5

S33 S34 13

14

K4 K5

N

L1

K4

K5

S33 S34 13

14

K4 K5

N

L1

S3

Logic Unit Logic Unit

35mm DIN

The unit 's Dimensions, see Fig.11.