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Electric Strike Lock with 12V DC Intercom: Issues in Bolt Release & Successful Tab Unlocking

Imperator74 48382 22
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Dlaczego elektrozaczep 12 V DC nie zwalnia języka po impulsie z wideodomofonu, mimo że słychać odblokowanie?

Najpierw sprawdź, czy język zamka nie jest dociśnięty do elektrozaczepu i czy sam zaczep może cofać się całkowicie bez żadnego oporu, bo nawet mały nacisk potrafi go zablokować [#7889433][#7890161] Najlepiej odłączyć przewody od wideodomofonu i przetestować zaczep z osobnego zasilacza lub baterii 12 V o wydajności co najmniej 0,5 A, a przy okazji zmierzyć napięcie i prąd podczas załączania [#7891078][#7893140] Jeśli na zewnętrznym zasilaniu działa poprawnie, to winne są najpewniej cienkie przewody, spadek napięcia albo zbyt mała obciążalność wyjścia interkomu, więc trzeba dać grubszy przewód lub osobne zasilanie dla zaczepu [#7893053] W niektórych tańszych wideodomofonach wyjście współpracuje tylko z krótko sterowanym zaczepem z pamięcią, więc zwykły elektrozaczep może nie być z takim systemem zgodny [#7893635][#7895548] Jeśli sam zaczep jest „twardy”, warto też sprawdzić jego regulację albo stan mechaniczny, bo czasem pomaga czyszczenie i smarowanie [#8114519]
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  • #1 7889402
    Imperator74
    Level 11  
    Posts: 61
    Rate: 11
    Hello
    I have a problem with the operation of the electric lock working with the intercom. The electric lock is 12v DC and the same voltage comes out of the video intercom. After pressing the key on the video intercom, you can hear the sound of releasing the bolt in the electric strike, but the electric strike does not release the tab from the insert. It drops 1 out of every 30 attempts to open it.
    What could be the reason?
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  • #2 7889433
    Lucjan52
    Level 27  
    Posts: 1304
    Help: 91
    Rate: 158
    Most likely, the reason for this state of affairs is the lack of clearance between the electric strike bolt and the lock bolt. The bolt of the lock presses the EZ bolt too hard and this causes the latch not to release.
  • #3 7890110
    Imperator74
    Level 11  
    Posts: 61
    Rate: 11
    I'll check it a moment ago. There is a gap between the lock and the electric strike.
    When I try to open the electric strike dry (on the other side, the wife turns on the opening of the gate from the video intercom), the electric lock also does not release under light finger pressure. Once it slowed down after about 25-30 presses.
  • #4 7890161
    niutat
    Level 36  
    Posts: 3247
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    Hello, the bolt of the electric strike must be fully loosened during release, the force of the electromagnet is only enough to undo it and a slight resistance is enough to block it. You need to set the lock so that the bolt can go back without any resistance (if necessary, you can file the place (with looseness) for the bolt if there is no possibility to adjust the catch)
  • #5 7890745
    Lucjan52
    Level 27  
    Posts: 1304
    Help: 91
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    If these procedures do not change anything, it remains to isolate the EZ power supply and use a power supply with higher current efficiency.
  • #6 7890897
    dzg4
    Level 31  
    Posts: 1662
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    Hello. How far is it from the intercom to the gate, what cross-section of the wire did you use?
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  • #7 7891078
    zybex
    Helpful for users  
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    The easiest way is to check and possibly adjust the lock by pulling up an independent 12V power supply for on-site tests. During this time, the cables from the intercom that were connected to it should, of course, be disconnected.
    Once I had to prove to someone that my veins were too small for the lock. At another customer, the lock itself was jammed (not used for years, because it was not connected) and it was enough to use some olive oil and it started working properly.
  • #8 7892387
    karl102
    Level 28  
    Posts: 867
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    Or maybe a bit of WD40 will suffice.
    Corrosion does not have a good effect on the freedom of movement of mechanical components.
  • #9 7892422
    niutat
    Level 36  
    Posts: 3247
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    karl102 wrote:
    Or maybe a bit of WD40 will suffice.
    Corrosion does not have a good effect on the freedom of movement of mechanical elements.

    If the bolt is supported, there is no chance for it to go back, all electric strikes have a problem with it. The only solution is to set the lock so that the bolt is released in the normal position.
  • #10 7892966
    karl102
    Level 28  
    Posts: 867
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    niutat wrote:
    .. The only solution is to set the lock so that the bolt is released in the normal position.

    And did I say no?
    I have already met bolts so corroded that it was difficult to move the armature to the open position even with a screwdriver.

    Maybe the gap is too big?
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  • #11 7893053
    Imperator74
    Level 11  
    Posts: 61
    Rate: 11
    The electric strike is completely loose because it is new. He's 10 days old :)
    it's the electric one
    http://www.napad.pl/katalog/produkty-287-1990-elektrozaczep-e1718-12v-dc-2888.htm
    The video intercom is connected in such a way that 2 cables go to the camera and 2 cables go from the camera to the electric lock. The distance of the video intercom to the cameras is approx. 7m and from the camera to the electric lock approx. 80cm
    In fact, I probably have to check the cables connecting the camera with the electric strike because they are thin, but I have an additional 1 pair so I will add.
    I guess the solution will also be to connect the 12v power supply directly to the electric lock and then it should probably work
    I would like to add that the electric strike is low-current, i.e. according to the video intercom specification, it cannot be higher than 300-350mA
  • #12 7893140
    karl102
    Level 28  
    Posts: 867
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    If possible, measure the supply voltage and current going to the electric strike when it is turned on.
  • #13 7893436
    zybex
    Helpful for users  
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    It's best to try if it works with the gate open. Just use your finger (after hearing that it catches) to try to release it.
  • #14 7893500
    Imperator74
    Level 11  
    Posts: 61
    Rate: 11
    Unfortunately, it doesn't work with the gate open either. You can only hear a buzz but the latch does not release. As I mentioned earlier, it drops once every 30 tries.
    I'll hook up the extra cable today and let you know how things are going.
    Thanks everyone for your help on the topic.
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  • #15 7893512
    zybex
    Helpful for users  
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    So there is no mechanical problem such as the wicket leaning too much on the catch. So make a short test, i.e. a 12V battery or power adapter (minimum 0.5A and maximum freely), extension cord.
    Another option is to remove the lock and check it on the table at home. By the way, how can you mount any of these things without first checking them briefly? You can't fully believe the producers, because then there are such effects. We run back and forth and the problem is still not solved.

    One more thing, next to this lock it is written that it is with tongue adjustment. Maybe something needs to be adjusted there?
  • #16 7893635
    Ircys
    Intercoms specialist  
    Posts: 6933
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    Hello,
    If it is a video intercom from a DIY store (e.g. Futuro), then such problems will occur, because basically only
    a short current pulse (DC) to the electric strike and then you need to use e.g. an electric strike with memory and not a regular one. It's just this (Chinese) type has it and that's it :)

    Regards
    www.alfatech.net.pl
  • #17 7893666
    zybex
    Helpful for users  
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    I agree with the speaker. If the manual said that the electric strike with memory, this one is unfortunately not suitable.
    By the way, the ones with (mechanical) memory I don't like very much. The point is that if someone in the house presses the unlock button (unnecessarily), the gate will be open all the time until someone goes to open it (physically) and close it again.
  • #18 7894141
    Nowart
    Level 20  
    Posts: 310
    Help: 26
    Rate: 104
    Could a colleague write what kind of video intercom, brand, model it is? I am asking because, for example, Laskomex video intercoms require a separate power supply for the electric strike. It's a bit hard to believe that the video intercom requires a memory hook (only and exclusively)
  • #19 7895152
    zybex
    Helpful for users  
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    I was installing such a "cheap" video intercom for someone and it was clearly written that the electric strike with memory. The customer already had an ordinary one in the gate and unfortunately only slightly knocked, but not everyone managed to open the gate at that time.
    I also assembled more expensive models and there is always only a connection to the lock circuit and of course there must be a separate power supply. However, none of the customers decided to use the lock.
  • #20 7895548
    Ircys
    Intercoms specialist  
    Posts: 6933
    Help: 1334
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    Nowart wrote:
    Could a colleague write what kind of video intercom, brand, model it is? I am asking because, for example, Laskomex video intercoms require a separate power supply for the electric strike. It's a bit hard to believe that the video intercom requires a memory hook (only and exclusively)


    Oh, there's a whole lot of it in supermarkets, e.g. the aforementioned Futuro, Initel, etc.
    nice looking no name chinese production.
    A quote, e.g. from the Initel manual: "The intercom is adapted to work with a pulse-controlled low-current electric strike with memory parameters 12V 0.3A (e.g. 1738-12DC by ....)"

    Regards
    www.alfatech.net.pl
  • #21 7896034
    Nowart
    Level 20  
    Posts: 310
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    Well, it's actually an invention, I return the honor bypassing such intercoms, regarding the hooks with memory, I support my friend zybex, if you press it and you don't open it, the plate keeps it open until someone comes in. This is good but not in every case, e.g. with two inputs one after the other (as the second) memory is useful, but for solo it is not very good for me.
  • #22 7897745
    zybex
    Helpful for users  
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    I also installed an electric strike so that when you press the button, the gate will spring back and you have a signal at home that it is open. There is simply an auxiliary microswitch in the electric strike. I connected the electric strike, but without the intercom. A friend just wanted a ringtone.
  • #23 8114519
    TeleMarek1982
    Level 1  
    Posts: 1
    Rate: 2
    Coming back to the original problem - I had exactly the same and even with the same hook. The hook worked on the test and for some time after plugging in. After a month it stopped opening. At first I thought it was a matter of poor cables, but the measurements showed that everything is fine. It was also not a matter of too short a signal from the intercom because I can adjust its length. Having no other idea, I treated the hook with WD40 and it started off - it opens without a problem. It is possible that long rains and high humidity killed him.
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Topic summary

✨ The discussion revolves around issues with a 12V DC electric strike lock connected to a video intercom, where the lock fails to consistently release the bolt. Users suggest potential causes including insufficient clearance between the lock and strike, inadequate power supply, and mechanical resistance. Recommendations include checking the wiring, using a higher current power supply, and ensuring the lock is properly adjusted. Some users mention the importance of using electric strikes with memory features for compatibility with certain intercoms. The conversation highlights troubleshooting steps such as testing with a direct power source and applying lubricants like WD40 to address mechanical issues.
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FAQ

TL;DR: A 3 % success rate (1 in 30 openings) shows something is wrong; “even 0.1 mm misalignment stops the latch” [Elektroda, Lucjan52, post #7889433] First, check clearance, then verify the lock is getting the full 12 V DC at ≥300 mA.

Why it matters: Correct diagnosis prevents replacing perfectly good hardware and saves up to €40 per strike.

Quick Facts

• Napad E1718 strike: 12 V DC, 280 mA nominal draw [Napad E1718 datasheet]. • Voltage drop should stay <5 % on 12 V lines; use ≥0.5 mm² cable for 7 m at 0.3 A [IEC 60204-1]. • Budget video intercoms (Futuro/Initel) output a 0.5–1 s DC pulse only [Futuro Manual]. • Recommended mechanical clearance: ≥1 mm between door latch and strike lip [Assa Abloy Install Guide]. • Memory-latch strikes cost approx. €25–40 online (2023 pricing).

Why does my 12 V electric strike buzz but the gate stays locked?

Two main causes:
  1. Latch presses on the strike, blocking the solenoid [Elektroda, Lucjan52, post #7889433]
  2. Voltage at the strike drops below 11 V when the coil draws 280 mA, so it hums but cannot retract [Elektroda, zybex, post #7891078] Check alignment first, then measure voltage under load.

How much current does the Napad E1718 low-current strike really need?

Manufacturer states 280 mA at 12 V DC, but locked-rotor inrush peaks near 350 mA for 20 ms [Napad E1718 datasheet]. Your power source and wiring must deliver that surge without dropping below 11 V.

What wire size prevents voltage drop on a 7 m run from my intercom?

For ≤5 % drop at 0.3 A on 12 V, use 0.5 mm² (about 20 AWG) or thicker. Thinner bell wire often halves the available current [IEC 60204-1].

Can the short DC pulse from cheap video intercoms be the whole problem?

Yes. Some supermarket units send only a 0.5–1 s pulse; a non-latching strike may not retract in time [Futuro Manual][Elektroda, Ircys, post #7893635] Using a strike with mechanical memory solves this design limit.

How do I bench-test the strike to rule out wiring faults?

  1. Disconnect strike from intercom.
  2. Apply 12 V DC from a 0.5 A bench supply directly.
  3. Observe: latch should click free with finger pressure. If it works on the bench, wiring or intercom is at fault [Elektroda, zybex, post #7891078]

What’s an easy 3-step alignment procedure for the strike and door latch?

  1. Close the gate and mark latch position on the strike lip.
  2. Shim or file the strike housing until a 1–2 mm gap is visible when closed.
  3. Retighten screws and test release 10 times consecutively. "A slight resistance is enough to block it" [Elektroda, niutat, post #7890161]

Is WD-40 a valid fix for a rarely used or weather-exposed strike?

Yes. One user restored normal operation by spraying WD-40 after rain-related corrosion stopped release [Elektroda, TeleMarek1982, post #8114519] Clean, dry, then apply a thin lubricant layer.

What is a strike with memory and when should I choose one?

A memory (latching) strike stays unlocked after a brief pulse until the door opens. Needed when the controller gives only a short 12 V pulse [Futuro Manual]. Drawback: if someone presses unlock accidentally, the gate remains open indefinitely [Elektroda, zybex, post #7893666]

How do I measure voltage and current at the strike without specialist gear?

Set a multimeter to DC volts, probe across the strike terminals while someone presses unlock. Value should stay above 11 V. Switch to the 10 A range, place meter in series, and verify 0.28–0.35 A draw [Elektroda, karl102, post #7893140]

Could humidity or rain permanently damage a low-current strike?

Yes. Extended humidity can oxidise the armature, increasing friction until the solenoid cannot retract—reported after one month of operation [Elektroda, TeleMarek1982, post #8114519] Regular lubrication and a weather cover prevent this edge-case failure.

What brands integrate well with Laskomex or similar systems that need separate power?

Any 12 V strike drawing ≤300 mA works when powered by an independent 12 V/1 A adapter, e.g., Assa Abloy ES110 or Bira DS-45. Connect the adapter through the intercom’s relay contacts as per Laskomex wiring guide [Laskomex KM-2 Manual].
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