Safety Light Curtain

A: Contact the professional sales staff on our website by email (info@garantta.com）and phone. We will recommend to you the most suitable safety light barrier device after knowing what your application is, what kind of resolution you need, how long of protection height and protection width you need.

A: Sensor light curtain is a photoelectric detection technology used in industrial automation and machine safety. It consists of a transmitter and a receiver and which are based on the principle of light propagation and reflection to detect and protect the safety of personnel or equipment.

A: Light curtains are divided into optical synchronization and line synchronization. Optical synchronization means that the reception and transmission of the light curtain do not require any communication line connection. The transmission emits infrared light according to the prescribed rules. After the receiver receives the light signal, it compares the signal emitted by the transmitter. If they are consistent, it means that the light curtain is not blocked at this time and outputs a light signal.

A: The main applications of safety light curtains include

■ Machine tool industry

■ Press industry

■ Automotive industry

■ Fixture equipment

■ Handling and storage systems

■ Welding equipment

■ Consumer goods and packaging industry

■ Area protection

■ Test equipment

■ Food manufacturing industry

■ Electronic equipment industry

■ Thermoforming machine industry

■ Medical equipment industry

■ Robot manufacturing industry

A: It is possible that it cannot run when the power is plugged in or suddenly. What should we do when encountering these problems? We have summarized some common simple faults and hope to help you.

1. Make sure that the safety light curtain is powered on correctly.

2. Check and confirm that the serial port cable used to connect the controller is straight-through, not a crossover cable.

3. Check and confirm that the serial port cable is intact and that both ends are not loose or falling off. If the safety light curtain still cannot operate normally after the above inspection and correction, please use a multimeter to measure whether the serial port of the connected control system hardware is damaged to confirm whether it should be returned to light curtain sensors manufacturer for inspection and repair. Of course, if you don’t understand, you can communicate with the Garantta safety light curtain manufacturer and perform simple repairs according to the requirements of manufacturer. If it doesn’t work, return it to the our factory for repair.

A: There are two main installation forms of safety light curtains: fixed and adjustable. Fixed installation: the sensor and reflector (or emitter and receiver) are directly fixed on the machine bed. It is usually suitable for closed presses with a frame structure where the mold is relatively fixed and the protective light curtain does not need to be adjusted frequently. Adjustable installation: the sensor and reflector (or emitter and receiver) are connected to the machine through a special bracket. In this installation form, the light curtain can be flexibly adjusted up and down, left and right according to the requirements of the mold opening and safety interval. It is generally suitable for open, closed and four-column presses with frequent mold changes and different mold sizes.

A: The optical axis is divided into:

1. Finger protection 10mm (the smallest object that can be distinguished is 14mm)

2. Palm protection 20mm (the smallest object that can be distinguished is 25mm)

3. Arm protection 40mm (the smallest object that can be distinguished is 45mm)

4. Human body protection is 80mm (the smallest object that can be distinguished is 85mm). 10mm is suitable for equipment with a relatively high degree of hazard. 

A: 1. Manufacturing quality: High-quality Garantta safety light curtains usually use more durable materials and more advanced production processes, thus having a longer service life.

2. Use environment: Such as high temperature, low temperature, humid, or corrosive environments. These environmental factors will accelerate the aging of the light curtain and shorten its service life.

3. Working temperature and frequency: Too high or too low working temperature will affect the performance and life of Garantta safety light curtains. At the same time, frequent use will also accelerate the wear of the Garantta light curtains

A: Safety light curtains are installed in dangerous areas to ensure the personal safety of operators, but when using safety light curtains, they will always encounter interference. How to avoid these situations has become the number one problem for users. The following are the general causes of interference:

1. Light source interference;

2. Frequency converter interference (high-frequency conversion, low-frequency conversion);

3. Position parallel interference;

Solution:

1. Light source interference is divided into strong light interference and reflection interference. These two types of interference are relatively easy to solve. In the position where the safety light curtains are used, the strong light lamp can be replaced with an ordinary lamp. Reflection interference is because there are relatively bright objects or mirrors near the safety light curtains. Move it outside the grating protection area to solve it.

2. Frequency converter interference 1. Is the light curtain's communication cable shielded? If there is, you must connect the shielded wire (shielded wire with better quality) and connect it to the ground wire; 2. Avoid passing through places with frequency converters when wiring;

3. Connect an intermediate relay to the signal line of the light curtains to isolate the interference signal, and the light curtains cannot use the power supply on the machine on site. You need to add an independent switching power supply. The advantage of this is to avoid the interference signal from being connected to the light curtains through the power supply

A: 1. First determine the installation position of the measuring grating transmitter and receiver, ensure that the two are in the same plane, the midpoints can be completely aligned, and install the mounting bracket with anti-vibration bolts and M4 screws (provided with the sensor). In places where the vibration is not strong, M4 or #8-32 bolts can be used as an alternative to anti-vibration bolts. Although the internal circuits of the detection light curtain transmitter and receiver can withstand strong vibrations, we still recommend using anti-vibration bolts to eliminate the damage that strong vibrations may cause to the sensor.

2. How to install the detection light curtain? Install the detection light curtain transmitter and receiver on the bracket, install their lenses face to face, and their outlet directions should be consistent. Measure the height of the two to determine whether they are aligned, make appropriate adjustments to align the measurement grating transmitter and receiver completely, and finally tighten the screws.

3. Connect the safety light curtain cable to the transmitter and receiver. You can cut off the excess cable. The cables used by the transmitter and receiver are the same (two cables are required for each system).

4. Wiring of the safety light curtain transmitter and receiver. Receiver output 1: It is an open collector NPN transistor output with a maximum breaking voltage of 30V dc and a maximum breaking current of 150mA. With overload and short circuit protection. Receiver alarm output: It is an open collector NPN transistor output with a maximum breaking voltage of 30V dc and a maximum breaking current of 150mA. With overload and short circuit protection.