FAQ
TL;DR: Wire Shelly 1 to 2 control terminals; "I to SS, O to COM." Match the power version to your board. This FAQ helps Key TCT42/CT202 users solve wiring, powering, and remote-control issues fast. [Elektroda, sisko, post #20457744]
Why it matters: Incorrect wiring or power can disable remotes or destroy your Shelly.
Quick Facts
- Step input: connect Shelly I to SS and O to COM; cycles Open/Stop/Close/Stop. [Elektroda, sisko, post #20457744]
- Power options: Shelly 1 is available in 230 V AC or 12–60 V DC versions. [Elektroda, sisko, post #20473096]
- 24 V DC hookup: Shelly N to +24 Vdc, Shelly L to GND; set DC jumper. [Elektroda, sisko, post #20457744]
- Add a push-button by wiring a momentary switch across SS and COM. [Elektroda, sisko, post #20473096]
- Gate status monitoring can use Shelly Uni’s ADC with a reed/open-signal light, powered from the drive. [Elektroda, marcingebus, post #20460045]
How do I wire Shelly 1 to a Key TCT42/CT202 step input?
Use the board's step input. Connect Shelly terminal I to SS, and terminal O to COM. This provides a momentary step command. One pulse cycles the controller through Open/Stop/Close/Stop. Keep control wiring low-voltage and separate from mains. [Elektroda, sisko, post #20457744]
What power supply should I use for Shelly 1 on this board?
Use a Shelly version that matches the available supply. The 230 V AC model connects to mains. The 12–60 V DC model connects to the controller's DC output. Do not mix versions. [Elektroda, sisko, post #20473096]
How do I connect the 24 V DC version correctly?
For 24 V DC, wire Shelly N to the control board's +24 Vdc. Wire Shelly L to the board's GND. Set the Shelly's jumper for DC operation. Confirm polarity before power-up. [Elektroda, sisko, post #20457744]
My remotes stopped working after I installed Shelly—how do I fix it?
Disconnect Shelly to isolate the radio system. If remotes work, adjust Shelly configuration. If not, reprogram remotes to the receiver. How-To:
- Power down, remove Shelly control wires, power up.
- Test remotes and re-teach them if needed.
- Reconnect Shelly and retest.
This sequence restores normal radio operation. [Elektroda, sisko, post #20473096]
What happens if I connect a DC-version Shelly to 230 V AC?
Expect catastrophic failure and safety risk. The DC-only Shelly must never see 230 V AC. Quote: "If you connect the 12, 24-60 V DC version to 230 V AC, you will only see fireworks." Replace the device if this occurred. [Elektroda, sisko, post #20473096]
How do I add a physical push-button to open the gate?
Wire a momentary 'doorbell' button to the same step-input terminals. Connect the button across SS and COM on the control board. The button will trigger Open/Stop/Close cycles like Shelly. Use a dry, normally-open contact. [Elektroda, sisko, post #20473096]
Where is the radio receiver card on the Key TCT42/CT202 board?
Check the plug-in receiver in socket J4 on the control board. Ensure it is fully seated and responsive to remotes. Reseat it if unresponsive. Then re-teach remotes as required. [Elektroda, sisko, post #20473219]
Do FAAC and Key remotes work interchangeably?
FAAC and Key use different radio systems and remotes. You cannot control both with one brand's remote without compatible receivers. Use separate remotes or a universal receiver. Verify compatibility before changes. [Elektroda, sisko, post #20473133]
Can I monitor gate position or open status with Shelly Uni?
Yes. Use Shelly Uni's ADC input to read a reed switch or an 'open signal' light. Power Shelly Uni from the drive's DC output. Map the ADC value to status in the app. This gives basic open/closed detection. [Elektroda, marcingebus, post #20460045]
The app works, but my remotes don't—could the Shelly app config be the cause?
Yes. Misconfigured Shelly settings can interfere with the control logic. Restore a simple momentary pulse configuration and retest. After correcting the app, both phone control and remotes worked for the user. Avoid unnecessary custom modes. [Elektroda, Maliniak1975, post #20483247]
How does the step command sequence behave on this gate controller?
Each trigger advances through four states: Open, Stop, Close, Stop. Use short pulses from Shelly's relay. This is the standard step sequence on the SS/COM input. Time pulses to avoid double triggers. [Elektroda, sisko, post #20457744]
What's the safest way to test whether Shelly is affecting remote reception?
Temporarily disconnect Shelly from SS/COM and test the remotes. If they work, Shelly's setup caused the issue. If not, reseat the radio card in J4 and reprogram remotes. Replace remote batteries if weak. [Elektroda, sisko, post #20473219]
