Photocells are essential components for the proper operation of an automatic gate. These small, often discreet sensors play a key role in obstacle detection and the safety of your installation. However, when they fail, they can immobilise your gate and complicate your day-to-day life.
Do not panic: with a few simple checks and the right tips, you can often identify and resolve the issue. Here is everything you need to know to act effectively.
How to diagnose a photoelectric cell fault
To begin, take a look at the photocells’ indicator lights. If they are off, this may indicate a power supply issue or a cell that is out of service. A flashing or dim light is also a sign you should not ignore.
Next, check the alignment: the two cells must be perfectly facing each other so that the infrared beam can pass unobstructed. A slight misalignment, caused by an impact or the wind, is enough to disrupt the system.
Finally, inspect the lenses for any obstruction—dead leaves, spider webs, or built-up dust can block detection.
Common causes of photocell malfunctions
Several factors can explain a failure:
- Poor alignment, often due to vibrations or a post that has shifted.
- Electrical wires that are loose, cut, or chewed by animals.
- Dirt embedded on the sensors, common after bad weather.
- An internal failure, such as a burnt-out electronic component.
- Moisture, which seeps into poorly sealed housings and corrodes the circuits.
These causes are generally easy to spot with a little observation.
Quick troubleshooting solutions
A thorough cleaning of the photoelectric cells can work wonders. Use a soft, dry cloth to remove dirt, and avoid harsh products that could scratch the lenses.
Next, check the connections: tighten the connector screws or replace a damaged wire if you spot one. To test the power supply, a multimeter is your best ally.
Measure the voltage at the cell terminals; if it is lower than what the manual specifies, the transformer or wiring could be at fault. Precise realignment using a spirit level may also be enough to restore communication between the sensors.
When and how should you replace the photocells?
If quick repairs fail, it may be time to replace the cells. Advanced wear or irreversible damage (such as a cracked lens) makes this step unavoidable.
At Clôture Discount, we offer motorisation kits that include photocells compatible with most gates, whether sliding or swing. To install the new cells, follow the manufacturer’s instructions: mount them securely, align them carefully, and connect the wires while observing polarity.
If you are not comfortable working with electricity, a professional will ensure an installation that is safe and compliant with standards.
Precautions to take during the repair
Before touching anything, switch off the gate’s main power supply to avoid any electrical risk. Work in dry conditions—moisture is the enemy of electronic components—and protect the cells with a cloth or cover if you need to leave them exposed for a while.
Handle the wires carefully so as not to worsen a fragile connection. Once the repair is complete, test the gate several times: open and close it while placing an object in the opening to check that the photocells detect obstacles properly. A properly repaired installation must combine reliability and safety, so do not neglect these final steps!
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