Hi,
I am asking for help in diagnosing a problem with a smart switch installation in an old building. Despite the neutral wire being supplied, the set falls into a strong flicker.
Hardware specification:
* Switch: Sonoff T3EU1C (version requiring full L+N supply).
* Receiver: 36W Struhm Klara D (Nemo) LED panel, 4000K colour.
* Installation: 1977 block of flats, original aluminium cables.
Installation details:
* I identified a blue wire in the switch box, which under load and in measurements gives a stable 231V relative to phase.
* I used DY 1.5mm² copper wire extensions.
* All aluminium-to-copper and copper-to-lamp connections made with WAGO 221 series connectors.
* A Miflex RC-LED 100nF 275Vac capacitor mounted in parallel under the ceiling.
Symptoms:
* When the switch is in the "OFF" state (blue backlight only), the lamp pulses steadily (approx. 1 Hz).
* When the switch is in the "ON" state, the lamp illuminates but falls into a very high flickering frequency (strong strobe).
* Key observation: when a normal mechanical switch is connected to the same place, the lamp works completely correctly, without any interference.
Question:
With this lamp (36W, switched power supply inside) and a Sonoff switch with N line, is it possible that the problem is a so-called stray capacitance or lack of phase separation? Could swapping the L and N polarity at the switch input help, or does the cause lie deeper in the power supply characteristics of this particular Struhm tube?
I would appreciate any tips on how to eliminate this flicker.
I am asking for help in diagnosing a problem with a smart switch installation in an old building. Despite the neutral wire being supplied, the set falls into a strong flicker.
Hardware specification:
* Switch: Sonoff T3EU1C (version requiring full L+N supply).
* Receiver: 36W Struhm Klara D (Nemo) LED panel, 4000K colour.
* Installation: 1977 block of flats, original aluminium cables.
Installation details:
* I identified a blue wire in the switch box, which under load and in measurements gives a stable 231V relative to phase.
* I used DY 1.5mm² copper wire extensions.
* All aluminium-to-copper and copper-to-lamp connections made with WAGO 221 series connectors.
* A Miflex RC-LED 100nF 275Vac capacitor mounted in parallel under the ceiling.
Symptoms:
* When the switch is in the "OFF" state (blue backlight only), the lamp pulses steadily (approx. 1 Hz).
* When the switch is in the "ON" state, the lamp illuminates but falls into a very high flickering frequency (strong strobe).
* Key observation: when a normal mechanical switch is connected to the same place, the lamp works completely correctly, without any interference.
Question:
With this lamp (36W, switched power supply inside) and a Sonoff switch with N line, is it possible that the problem is a so-called stray capacitance or lack of phase separation? Could swapping the L and N polarity at the switch input help, or does the cause lie deeper in the power supply characteristics of this particular Struhm tube?
I would appreciate any tips on how to eliminate this flicker.
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