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Working principle, wiring diagram and use method diagram of safety relay

Safety relay working principle, wiring diagram, use method diagram 2021-01-13 The so-called "safety relay" is composed of several relays and circuits, in order to complement each other's abnormal defects and achieve the complete function of the relay with correct and low misoperation. The lower the error and failure value, the higher the safety factor. The "safety relay" is not a "relay without failure", but makes regular actions when a failure occurs. It has a forced guiding contact structure, in the event of contact melting phenomenon can also ensure safety, which is completely different from the general relay. Parokan safety relay is a necessary control part of the safety circuit. It accepts the safety input, through the judgment of the internal circuit, and outputs the deterministic switching signal to the control circuit of the equipment. Simply put, the safety relay is a dual-channel signal type. Only when the two channel signals are normal, the safety relay can work normally; during the working process, as long as any channel signal is disconnected, the safety relay will stop outputting until Both channel signals are normal and can work normally after reset. Working principle of Parokan safety relay 1. Electromagnetic Electromagnetic relays are generally composed of iron core, coil, armature, contact reed, etc. As long as a certain voltage is applied to both ends of the coil, a certain current will flow in the coil, which will produce an electromagnetic effect. The armature will overcome the pulling force of the return spring and attract to the iron core under the action of electromagnetic force, thereby driving the armature The moving contact (normally open contact) and the static contact (normally closed contact) are attracted. When the coil is de-energized, the electromagnetic attraction will disappear, and the armature will return to its original position under the reaction force of the spring, releasing the moving contact and the original static contact. This suction, release, so as to achieve the purpose of conduction and cut off in the circuit. For the "normally open and normally closed" contacts of the relay, it can be distinguished as follows: the static contact in the off state when the relay coil is not energized is called the "normally open contact"; the static contact in the on state is called "Normally closed contact". 2, thermal dry The thermal reed relay is a new type of thermal switch that uses thermal magnetic materials to detect and control temperature. It is composed of temperature sensitive magnetic ring, constant magnetic ring, dry reed switch, heat conduction mounting piece, plastic substrate and other accessories. The thermal reed relay does not need to be excited by the coil, but the magnetic force generated by the constant magnetic ring drives the switch. Whether the constant magnetic ring can provide magnetic force to the reed switch is determined by the temperature control characteristics of the temperature sensitive magnetic ring. 3. Solid State Solid state relay is a four-terminal device with two terminals as input terminals and the other two terminals as output terminals. The isolation device is used in the middle to realize the electrical isolation of input and output. Wiring Diagram of Safety Relay The internal wiring principle of the Parokan safety relay: The corresponding wiring diagram of the two applications of the Parokan safety relay is as follows: Paroken Safety Relay Usage In our daily work, such relays are common in electrical equipment control systems, especially in imported equipment. Especially when the equipment fails suddenly, the equipment cannot operate normally before the fault is eliminated or the fault is not confirmed. In order to prevent equipment failure after the sudden operation to bring danger to people or equipment. We take a safety relay as an example, its internal control circuit as shown in the figure below: The main points of use of the Paroken safety relay are as follows: 1. The connection method of power supply. In the figure, A1 and A2 are power terminals, A1 is connected to 24V ;A2 is connected to 0V. 2. In the control input circuit, during normal use, required switching conditions need to be connected between S11 and S12 and between S11 and S22. Generally for the contact or button contact. 3. In the reset circuit, a corresponding reset condition needs to be connected between S33 and S34. At the same time, the condition between Y1 and Y2 is also part of the reset circuit, and both conditions must be true at the same time. So, how do they work? A. if the safety relay needs to be closed (I .e. K1,K2,K4,K5 have electricity), it is useless to only meet the requirement that the input circuit has electricity (I .e. terminals S12,S22 have electricity). if K1,K2,K4,K5 are all closed, besides S12,S22 have electricity, it is also necessary to meet the condition of K3 closing. B. if K3 is closed, the condition is that K1,K2,K4 and K5 are all powered off and the reset circuit is powered (I .e. terminal Y2 is powered). That is, S33 to S34 are turned on, and Y1 and Y2 are also turned on at the same time. 2. Example: In the drawing of a certain equipment control circuit, there is the following figure in its control loop: Press the connection method shown in the upper and lower figures: if K11 loses power after pressing the external emergency stop button, even if the external emergency stop switch is reset, the input circuit is already powered, but the K11 internal relay must be powered only after pressing the fault confirmation button on the control box 190SP1. To sum up, when the emergency stop is released, the machine cannot restart suddenly (you must click on the fault confirmation, that is, the fault reset can be used to get electricity again), thus ensuring the safety of the person and others. Paroken Safety Relay Model Paroken PASR series safety modules are mainly used between safety protection components (such as safety door switch, emergency stop switch, safety light curtain, etc.) and start-stop control components (such as relay, hydraulic solenoid valve, etc.) of machine equipment to confirm the safety input of the machine (such as whether the safety door is closed in place, whether the safety light curtain is blocked, whether the valve core of the safety valve is blocked, etc.). PASR-9000A suitable for monitoring emergency switches and safety doors PASR-9000B suitable for monitoring safety carpet or safety edge PASR-9000N suitable for monitoring safety light curtains (NPN) PASR-9000P suitable for monitoring safety light curtains (PNP) PASR-9000S for two-handed start PASR-9002T suitable for monitoring emergency switches and safety doors


Working principle, wiring diagram and use method diagram of safety relay2021-01-13

so-calledSafety relayIt is composed of several relays and circuits in order to complement each other's abnormal defects and achieve the complete function of the relay with correct and low misoperation. The lower the error and failure value, the higher the safety factor,Safety relayis notNo faulty relay, but to make a regular action when a fault occurs, it has a forced guide contact structure, in case of contact melting phenomenon can also ensure safety, which is completely different from the general relay.

 

ParokenSafety relay is a necessary control part of the safety circuit, it accepts the safety input, through the judgment of the internal circuit, the deterministic output switch signal to the control circuit of the equipment. Simply put, the safety relay is a dual-channel signal type. Only when the two channel signals are normal, the safety relay can work normally; during the working process, as long as any channel signal is disconnected, the safety relay will stop outputting until Both channel signals are normal and can work normally after reset.

 

Working principle of Parokan safety relay

 

1Electromagnetic

 

Electromagnetic relays are generally composed of iron core, coil, armature, contact reed, etc. As long as a certain voltage is applied to both ends of the coil, a certain current will flow in the coil, which will produce an electromagnetic effect. The armature will overcome the pulling force of the return spring and attract to the iron core under the action of electromagnetic force, thereby driving the armature The moving contact (normally open contact) and the static contact (normally closed contact) are attracted. When the coil is de-energized, the electromagnetic attraction will disappear, and the armature will return to its original position under the reaction force of the spring, releasing the moving contact and the original static contact. This suction, release, so as to achieve the purpose of conduction and cut off in the circuit. For the relayNormally open, normally closedContacts can be distinguished as follows: a static contact that is in an open state when the relay coil is not energized is callednormally open contact; The static contact in the on state is callednormally closed contact.

 

2Thermal Dry

 

The thermal reed relay is a new type of thermal switch that uses thermal magnetic materials to detect and control temperature. It is composed of temperature sensitive magnetic ring, constant magnetic ring, dry reed switch, heat conduction mounting piece, plastic substrate and other accessories. The thermal reed relay does not need to be excited by the coil, but the magnetic force generated by the constant magnetic ring drives the switch. Whether the constant magnetic ring can provide magnetic force to the reed switch is determined by the temperature control characteristics of the temperature sensitive magnetic ring.

 

3Solid State

 

Solid state relay is a four-terminal device with two terminals as input terminals and the other two terminals as output terminals. The isolation device is used in the middle to realize the electrical isolation of input and output.

 

Wiring Diagram of Safety Relay

 

The internal wiring principle of the Parokan safety relay:

 

 

Paroken Safety Relay2The corresponding wiring diagram for each application is as follows:

 

 

Paroken Safety Relay Usage

 

In our daily work, such relays are common in electrical equipment control systems, especially in imported equipment. Especially when the equipment fails suddenly, the equipment cannot operate normally before the fault is eliminated or the fault is not confirmed. In order to prevent equipment failure after the sudden operation to bring danger to people or equipment.

 

We take a safety relay as an example, its internal control circuit as shown in the figure below:

 

 

The main points of use of the Paroken safety relay are as follows:

 

11. The connection method of power supply. FigureA1andA2is the power terminal,A1 connected24V ;A2connected0V.

 

2In the control input circuit, during normal use, it is necessaryS11andS12 andS11andS22between access to the required switching conditions. Generally for the contact or button contact.

 

3In the reset circuit,S33andS34Between the need to access the corresponding reset conditions. At the same time,Y1andY2The condition between is also part of the reset circuit, and both conditions must be true at the same time.

 

So, how do they work?

 

A.If the safety relay is required to pull in (I. e.K1,K2,K4,K5There is electricity), only meet the input circuit has electricity (I .e. terminalS12,S22Electricity) is useless, if you want to letK1,K2,K4,K5All closed,S12,S22In addition to electricity, it needs to be satisfied.K3Conditions of closure.

 

B.If satisfiedK3closed, provided thatK1,K2,K4,K5All power is lost, and the reset circuit is powered (ie terminalY2have electricity). namelyS33ToS34ON, andY1andY2Also conductive at the same time.

 

2.Example: In the drawing of a certain equipment control circuit, there is the following figure in its control loop:

 

 

 

Press the connection method shown in the upper and lower figures: if the external emergency stop button is pressed, the rearK11If the power is lost, even if the external emergency stop switch is reset, the input circuit is already powered, but the control box must be pressed.190SP1After the fault confirmation button on,K11The internal relay is only energized.

 

To sum up, when the emergency stop is released, the machine cannot restart suddenly (you must click on the fault confirmation, that is, the fault reset can be used to get electricity again), thus ensuring the safety of the person and others.

 

Paroken Safety Relay Model

Paroken PASR series safety modules are mainly used between safety protection components (such as safety door switch, emergency stop switch, safety light curtain, etc.) and start-stop control components (such as relay, hydraulic solenoid valve, etc.) of machine equipment to confirm the safety input of the machine (such as whether the safety door is closed in place, whether the safety light curtain is blocked, whether the valve core of the safety valve is blocked, etc.).

PASR-9000A suitable for monitoring emergency switches and safety doors

PASR-9000B suitable for monitoring safety carpet or safety edge

PASR-9000N suitable for monitoring safety light curtains (NPN)

PASR-9000P suitable for monitoring safety light curtains (PNP)

PASR-9000S for two-handed start

PASR-9002T suitable for monitoring emergency switches and safety doors