Type 4 Light Curtains are photoelectric protection devices in the industrial safety field that meet the highest safety level (Type 4) specified in the international standard IEC 61496. They primarily protect operators from machine damage by forming an invisible infrared light curtain between the transmitter and receiver. When any object blocks the light curtain, it instantly sends a signal to stop the hazardous equipment.
Key Features and Advantages
Ultimate Safety: Through redundant design, dual independent loop outputs, and continuous self-diagnostics, safety functions are ensured to remain intact even in the event of a single component failure. Its safety level reaches PL e, the highest level in the ISO 13849 standard, suitable for the highest-risk applications.
Reliable Output Signal: Type 4 Light Curtains are typically equipped with dual safety outputs via OSSD (Output Signal Switching Device). For fail-safe operation, PNP output is strongly recommended. When the output circuit is accidentally short-circuited to ground, the PNP output will immediately switch to the open state, stopping the equipment, while the NPN output may fail in this situation, leading to a serious safety accident.
Rugged and Adaptable: To cope with harsh industrial environments, level 4 safety light curtains typically have high protection ratings (e.g., IP65/IP67), providing dust and water resistance. They also possess strong resistance to electromagnetic interference and light interference, ensuring stable operation in environments with high interference, such as welding and frequency converters.
Feature-Rich and Flexible Installation: Modern level 4 safety light curtains also integrate many convenient functions. For example:
Blind-spot-free design: Eliminates detection blind spots at both ends of the grating, achieving comprehensive protection.
A/B optical function: Allows two sets of gratings to be used simultaneously at close range, avoiding mutual optical crosstalk.
Ultra-long detection distance: Some models can achieve a detection distance of 10 meters or even further, suitable for large equipment.
FAQ
What are the differences between a level 2 safety light curtain and a Type 4 Light Curtain?
| Comparison Dimensions | Type 4 Light Curtain | Type 2 safety light curtain |
| Security level | Highest standard, conforming to Cat.4 PL e (ISO 13849-1) standard. | Medium, compliant with Cat.2 PL c/d standards |
| Core Principles | The dual-loop redundant structure has real-time self-testing and cross-testing functions. | Single-loop structure with periodic self-testing |
| Fault Response | In the event of any internal failure, the system can immediately enter a safe state, ensuring that the protection remains effective. | The fault may not be detected until after one work cycle. |
| Main applications | High-risk areas, such as stamping machinery, robotic workstations, and automated production lines. | Low- to medium-risk areas, such as some packaging machinery and conveyor belts |
What are the causes of safety light curtain malfunctions?
Safety light curtains, also known as safety light screens, are widely used in industrial production, machine tools, automated inspection and measurement, and other fields. However, they may occasionally encounter minor malfunctions during use. So, what causes these malfunctions?
1. Occasionally outputting abnormal signals during machine operation: This is usually due to a loose photoelectric connector. Check the connector and tighten the screws.
2. Red and green lights flashing continuously: This may be due to a faulty shielding wire, causing electromagnetic interference to the photoelectric sensor (such as from a frequency converter or dimmer switch). Grounding the shielding wire will solve the problem.
3. The light curtain is not aligning with the light source: This is likely because the light curtain itself is damaged and needs to be replaced.
4. Abnormalities when the light curtain is turned on: If the light is too strong, it may interfere with the normal operation of the light curtain. Try replacing it with a weaker light source.
What precautions should be taken when using a Type 4 Light Curtain?
1. Regular Cleaning: Clean the light curtain surface regularly to prevent damage from dust, dirt, and grease, and to maintain its working efficiency.
2. Correct Use and Installation: Follow the manufacturer's usage and installation guidelines to ensure correct use and installation of the Garantta safety light curtain, avoiding unnecessary damage.
3. Regular Maintenance: Regularly check the electronic components and transmission cables of the light curtain equipment to ensure they are functioning properly, ensuring that potential problems are identified and resolved promptly.
4. Environmental Protection: Provide suitable environmental conditions, such as controlling temperature and humidity and avoiding the intrusion of corrosive substances, to slow down the aging of the light curtain.
The lifespan of a safety light curtain is affected by various factors, but its lifespan can be extended through quality assurance, proper maintenance and care, and selecting suitable environmental conditions.
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