Pilz PSEN opII4H Safety Light Curtain Complete Guide

Maximum cable length: 50m

5.3 Auxiliary Wiring Tools

PSEN opII Y Junction M12-M12/M12 is a practical wiring adapter that can connect transmitters and receivers to one M12 port, particularly suitable for the following scenarios:

Rear channel protection application

Parallel installation of multiple sets of security light curtains

Remote control cabinet connection

6. Operation status and diagnosis

6.1 Status indication

The PSEN opII4H is equipped with LED status indicators on both the transmitter and receiver for easy on-site diagnosis

Receiver LED indication:

Green constantly on: normal operation, displaying the current reception quality (three levels)

Green flashing: Safety light curtain activated

Red constantly on: Protection field interrupted

Red/green flashing: OSSD fault or general fault

Red/green flashing alternately: stray light warning or malfunction

Transmitter LED indication:

Green constant light: normal transmission state, can display the current encoding mode (no encoding, A encoding, B encoding)

6.2 Startup and restart

PSEN opII4H adopts automatic start and automatic restart modes. When the following conditions are met, the safety light curtain automatically starts and OSSD switches to the ON state:

OSSD wiring is correct

No malfunction occurred

Protecting the field without obstruction

During operation, when the protection field is obstructed and restored to an unobstructed state, OSSD automatically switches back to the ON state, but it must meet the following conditions:

Restore the protection field to an unobstructed state

At least 80ms have passed since OSSD switched to OFF state

6.3 Fault Handling

When the safety light curtain malfunctions, OSSD remains in the OFF state. The types of faults include:

OSSD malfunction: Safety light curtain needs to be restarted

Stray light fault: can be solved by using beam encoding, installing shading plates, or swapping the position of the transmitter and receiver

Overheating fault: Check the ambient temperature to ensure compliance with technical specifications

Undervoltage fault: Check the power supply voltage

7. Advanced applications: blocking function

7.1 Overview of Shielding Function

Muting refers to the control function that temporarily and automatically suspends the safety function, allowing materials to pass through the protected area during non hazardous periods or through other safety measures. This function is widely used in scenarios such as conveyor lines and material entry and exit.

7.2 Shielded Sensor Configuration

PSEN opII4H can be used in conjunction with single beam sensors (such as PSEN op3.3) to achieve shielding function. The minimum distance must be maintained between the shielded sensor and the safety light curtain to avoid mutual interference. The working wavelength of the shielded sensor must be different from the safety light curtain or maintain sufficient physical distance.

7.3 Blocking Application Types

Cross Muting: Suitable for materials entering and exiting hazardous areas. Two shielded sensors are arranged in an intersecting manner, with their intersection point located behind the protection field. The triggering time interval between the first and second shielded sensors shall not exceed 4 seconds.

L-type shielding: only applicable for materials leaving hazardous areas. The following distance requirements must be followed:

Shielding sensor 1 and 2 spacing>100mm

Shielding sensor 2 and protection field distance>100mm

The length of the object triggering the shielding state is greater than (a+b)

The distance between two transported objects is greater than (a+b)

T-shaped shielding (sequential shielding): suitable for bidirectional entry and exit of materials in hazardous areas. Four shielded sensors are required, arranged in a T-shaped pattern. Recommended distance requirements in accordance with IEC 62046 standard.

7.4 Unauthorized Functions

When the blocking function fails, the override function allows manual operation to clear the fault. Unauthorized operations must meet the following conditions:

Unauthorized activation is only allowed when at least one shielded sensor has been triggered and the protection field is obstructed

Unauthorized activation will not automatically initiate movement and requires separate control of the device

If the hazardous area is not visible, a spring reset key switch must be used and an emergency stop must be initiated from the same position

8. Regular inspection and maintenance

8.1 Daily Inspection

Pilz recommends regular check ups every six months:

Check the front panel: replace if scratched, clean if dirty

Check fasteners: All screws must be tightened to the specified torque

Check safety function: Use a test stick to block the protection field at different positions and verify whether OSSD switches normally

8.2 Cleaning and Maintenance

The cleaning of the front panel of the safety light curtain only requires the use of a damp cotton cloth, and the use of alcohol, solvents, wool cloth, or synthetic fiber cloth is strictly prohibited to avoid damaging the surface. In environments with high levels of dust, the frequency of cleaning should be increased.

8.3 Inspection after renovation