Continuous Lighting Issue: Stairwell Motion Sensor Fails to Turn Off Lamp

Question

I have a problem with the motion sensor that controls the lighting in the stairwell, when switched on the lamp lights up all the time. At first when I first noticed that the lamp does not stay off I disconnected the power supply from the sensor and switched it on again the problem disappeared...

darek1.65 · Accepted Answer

To help you, answer these questions:1. What does it mean that the relay works, does the relay short-circuit the working contacts when no voltage is applied.2. Measure the voltage (DC) on the relay coil when the light bulb is on.3. Measure the voltage on the electrolytic capacitor (black by the relay) may have lost capacity (if you have a capacitance meter measure it) because it looks swollen. 4. Measure the potentiometers cz do not have cracks on the horseshoes (I had such a case) whether the sliders adhere to the horseshoes.

Anonymous · Accepted Answer

To the first eye it is thrown a swollen capacitor and tan next to the diode.

T502 · Answer

The damage is in the electronic circuit. Measure something, write what happens to the voltages and then you can somehow help. Because after such a formulated question, one can only advise you to take the sensor to a service center.

wojtepanik · Answer

In most lamps with a sensor there is the possibility to set the sensitivity of the sensor, the length of light and the time of switching on ( twilight sensor), such knobs under the bottom of the sensor, if the adjustment with it does not work then I recommend to return to service.

retrofood · Answer

For 99% this is the correct answer. Topic basically to be closed.

kostom · Answer

Which voltages to measure? I took pictures, but I have trouble posting on the forum.

marcinolesno · Answer

The original lamp with a sensor or separate sensor separate lamp? There are sensors that have a certain minimum power, if this is not exceeded, it happens that the sensor fixes, and, for example, does not turn off. Or another situation, maybe the lamp and the sensor badly located in relation to each other, ie, the heat emitted by the lamp causes the activation of the sensor (as we know, sensors respond to heat emitted by moving objects).

kostom · Answer

Sensor separately lamp separately. The sensor is used to turn on an additional light in the stairwell. It is connected to a 15W incandescent bulb and worked without fail for about 4 years, until here suddenly after returning from vacation I observed that the light does not go out. The timer is set to minimum because the upper staircase landing is in the middle of the building and the sensor is only used to turn on the light when the kids move between doors.

relisys-js · Answer

Sometimes it is so that the relay contacts can hang up . More than once it helped to lightly hit the sensor. As you took it off then with a meter you can ring it between the L terminal , and the L' (output) terminal . If it conducts then the relay is to blame. If not then, as my colleagues wrote above, the fault lies in the electronics, then service or simply buy a new one at a cost of about 30 zł.

kostom · Answer

The relay works I checked. However, the cost of a new one is a minimum of 50 - 60 zlotys (360° sensor). Therefore, I undertook the repair myself if I knew which voltages to measure maybe it would be possible to locate the damaged component. Maybe I will be able (finally) to paste pictures today I think I succeeded?

kostom · Answer

To help you out, answer these questions:1. What does it mean that the relay is working, does the relay short the working contacts in the no voltage condition? No. Without voltage, the contacts normally open. 2. Measure the voltage (DC) on the relay coil when the bulb is lit. 15.5V 3. Measure the voltage on the electrolytic capacitor (black one by the relay) it may have lost capacitance (if you have a capacitance meter measure it) because it looks swollen. 17.2V. Unfortunately I have no way to measure the capacitance 4. Measure the potentiometers cz do not have cracks on the horseshoes (I had such a case) whether the sliders are adjacent to the horseshoes. I soldered and measured the horseshoe from the timer (it is OK) because I think the problem is in this module. The timer is set to minimum so it is on short circuit.

Krzyś33 · Answer

Hi. Disconnect the lighting detector and connect the circuit under voltage. If it turns on for a while and then turns off, then you have a defective detector, if not then the electronic circuit to replace. Greetings.

kostom · Answer

Due to the inability to measure the capacitance of the capacitor that darek1.65 and lordpakernik wrote about, I asked a colleague to check the circuit and indeed it turned out that the damaged component was the capacitor. The detector works, thank you for your help and I consider the topic closed.

Continuous Lighting Issue: Stairwell Motion Sensor Fails to Turn Off Lamp

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