Application example PNOZ s5 safety relay monitoring safety door switch

In the previous article, we introduced Pilz safety relay PNOZ s5. Today in this article, we will give an application example: using PNOZ s5 to monitor safety door switches.

This article includes the following topics:

Application scenarios

Safety switch introduction;

Design ideas;

EPLAN electrical schematic diagram;

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1. Application scenarios

In order to prevent people from entering the dangerous area of machine operation by mistake, the area is fenced and a safety door is installed. Only when the safety door is closed, the machine can run. If the safety door is opened during the operation of the machine, immediately cut off the power supply of the machine and brake emergency. The following picture is a schematic diagram of a safety door using a mechanical safety switch as the main control element:

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2. Introduction to Safety Switch

Safety switches are the core components of safety doors. Common safety switches include mechanical, induction, and so on.

This example uses Pilz mechanical safety switch PSENmech3.1, and its appearance is shown in the figure below:

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The safety switch has 2 normally closed contacts, which are closed by default (not triggered); when the safety switch is triggered (the door is opened), the 2 normally closed contacts are disconnected;

3. Design ideas:

The two normally closed contacts of the safety door switch are connected to the two input channels S11/S12 and S21/S22 of the safety relay PNOZ s5, and the immediate action normally open contacts 13/14 are connected in series to the motor control circuit to control the contactor ( KM1) coil; contactor KM1 controls the start and stop of the motor; the immediate action normally open contact 23/24 controls the brake of the motor. When 23/24 is closed, the motor brake is released and the motor can operate normally; when 23/ After 24 is disconnected, the motor brake is closed and the motor cannot operate normally;

When the safety door is closed:

The normally closed contact of the safety switch is closed;

The input channel of the safety relay PNOZ s5 is in the closed state, so its normally open contacts 13/14 and 23/24 are closed, the motor control circuit is connected, the brake is released, and it can operate normally;

When the safety door is opened:

The safety switch is triggered and its normally closed contact is disconnected;

The input channel of the safety relay PNOZ s5 is in the open state, so its normally open contact 13/14 is disconnected, the motor control circuit is disconnected, and the motor loses power; the normally open contact 23/24 is disconnected, the motor brake is closed, The motor that loses power under the action of the brake will brake urgently;

4. EPLAN electrical schematic diagram

The picture below is the PNOZ s5 power supply and safety input channel drawn by EPLAN:

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among them:

S3 is the reset button;

S4/S5 is the normally closed contact of the safety door switch;

X3 (A1) is connected to the 24V positive pole;

X4(A2) is connected to 24V negative pole;

X2(Y32) is the output signal of PNOZ s5, connected to the digital input channel of PLC;

The following picture is the schematic diagram of PNOZ s5 auxiliary contact:

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among them:

The output channel Q0.0 is connected to the normally open contact S13/S14 of PNOZ s5, and then connected to the coil of the motor contactor KM1;

The output channel Q0.1 is connected to the normally open contact S23/S24 of PNOZ s5, and is connected to the coil of the intermediate relay K1; the intermediate relay K1 is used to control the motor brake (AC220V), as shown in the following figure:

Encoder|Transmitter|Soft starter|Power supply|VFD|Light curtain|Servo products|Human-machine interface|Solenoid valve|Cylinder|Actuator|Flow meter|Transformer|Thyristor|Sensor|Deceleration drive gearbox reducer|Linear guide|Circuit breaker|Refrigeration compressorAll industrial products of okplazas are purchased from the original factory or formal channels of agents to ensure the original authenticity, which perfectly solves the problem of industrial product sample procurement and small-batch procurement for the majority of engineers and purchasing personnel.

In addition, Pilz also has PSENgate/PSENlock series products, which have more powerful safety door functions. If you are interested, you can go to the official website to see.

Well, this is an application example of the safety door (safety switch) based on PNOZ s5. If you have any questions, please leave a message for discussion.