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No voltage on NO1/NO2 contacts of Eura-Tech AC-30C7 lock

tedeo1 3183 16
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Why is there no voltage on the NO1/NO2 and NC1/NC2 contacts of my Eura-Tech AC-30C7 code lock when it is activated?

No—those NO/NC terminals are just relay contacts, so they do not produce voltage by themselves; the electric strike must be wired into a powered circuit that the lock switches through COM1/NO1 or COM1/NC1 [#18281958][#18282042] If the relay inside the code lock clicks when you enter a code or present a transponder, the lock is working and the missing voltage is a wiring/connection issue, not necessarily a fault [#18282009][#18281958] You only have control contacts, so the striker still needs its own power supply; the lock does not power it directly [#18281976][#18282042] In other words, connect the striker and power supply in the relay circuit, then the lock can open it by switching that power [#18282042]
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  • #1 18281939
    tedeo1
    Level 10  
    Posts: 100
    Rate: 9
    Hello
    I bought a code lock to open the gate and the electric door opener, but it does not work as it should, because I powered it with 12vDC power supply, when I activate it with a code or a key ring, there is no voltage on NO1 and NO2 contacts and thus it does not open the electric door opener, on NC1 NC2 contacts also no voltage. Is it possible that the code lock has been faulty since new or have I done something wrong?
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  • #2 18281956
    Rysiek2
    CCTV and Stationary Alarms specialist  
    Posts: 3399
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    Describe how you connected it.
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  • #3 18281958
    Anonymous
    Level 1  
  • #4 18281961
    tedeo1
    Level 10  
    Posts: 100
    Rate: 9
    2 wires from the electric door strike 1 to NO1 the other to COM1 of the code lock, in addition to the code lock power supply + to + from the power supply and minus to minus from the power supply, that's all.
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  • #5 18281963
    Anonymous
    Level 1  
  • #6 18281964
    tedeo1
    Level 10  
    Posts: 100
    Rate: 9
    sharp wrote:
    How to say it, and not to offend....

    ...There will be no voltage on these outputs.... In any case not directly.
    .

    could you be more specific?

    @U.P. Well, that's exactly how I wired it up
  • #7 18281967
    Anonymous
    Level 1  
  • #8 18281970
    tedeo1
    Level 10  
    Posts: 100
    Rate: 9
    sharp wrote:
    Of course - see in the instructions what you are missing. Because it is missing.
    .

    aa I have already solved it, thank you, I have one more question, namely can I control the gate without a power supply, I mean only short circuit?
  • #9 18281976
    Anonymous
    Level 1  
  • #10 18281982
    tedeo1
    Level 10  
    Posts: 100
    Rate: 9
    sharp wrote:
    No.
    Didn't you notice that the striker has to be powered by something? You only have the control contacts.


    So I will have to change the electric striker to one that is powered closed?
  • #11 18281990
    Anonymous
    Level 1  
  • #12 18282009
    tedeo1
    Level 10  
    Posts: 100
    Rate: 9
    Yes it does, but the one in the combination lock
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  • #13 18282042
    Anonymous
    Level 1  
  • #14 18282053
    tedeo1
    Level 10  
    Posts: 100
    Rate: 9
    Ok, I see, but in that case can I control the riffle from the intercom if the intercom, when pressed, applies power to it?
  • #15 18282063
    Anonymous
    Level 1  
  • #16 18282121
    tedeo1
    Level 10  
    Posts: 100
    Rate: 9
    I also have a question about the mains-free control of the door, can I use a code lock?
  • #17 18282147
    Anonymous
    Level 1  
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Topic summary

✨ The discussion revolves around a malfunctioning Eura-Tech AC-30C7 code lock, which fails to provide voltage on the NO1 and NO2 contacts when activated. The user describes their wiring setup, connecting the electric door strike to the NO1 and COM1 terminals, and powering the lock with a 12V DC supply. Responses suggest checking the manual for correct wiring, as the user may have misconfigured the connections. It is clarified that the lock's relay activates, but the electric striker requires its own power source. The user inquires about controlling the gate without a power supply and whether the lock can be used with an intercom system, receiving confirmation that both are possible with the right setup.
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FAQ

TL;DR: On the AC‑30C7, the 2 relay outputs are dry contacts—"There will be no voltage on these outputs." Wire your strike’s 12 V through COM–NO/NC to make it open on code or tag. [Elektroda, Anonymous, post #18281958]

Why it matters: This helps DIYers fix “no voltage” on Eura‑Tech AC‑30C7 and correctly wire strikes or gate inputs.

Quick Facts

Why is there no voltage on NO1/NO2 or NC1/NC2 of my AC‑30C7?

Those terminals are dry contacts. They don’t provide voltage; they only open or close a circuit. As one expert noted, “There will be no voltage on these outputs.” To open a strike, feed it from a power supply and route one conductor through COM and NO (or NC). When testing, measure continuity across the relay, not voltage. [Elektroda, Anonymous, post #18281958]

How do I wire the AC‑30C7 to power an electric strike?

Use the keypad as a switch in the strike’s supply circuit.
  1. Connect PSU + to COM, and COM to strike + via NO (or NC).
  2. Connect PSU – directly to strike –.
  3. Enter a valid code; the relay closes and completes the strike circuit. This routes power through the relay so the latch releases on activation. [Elektroda, Anonymous, post #18282042]

Do I need a separate power supply for the strike, or can the keypad power it?

Use a dedicated power supply for the strike. The keypad does not source power; it only switches. As the expert put it, “You only have control contacts.” Size the PSU to your strike’s voltage and current, and wire the strike through COM–NO/NC on the keypad. [Elektroda, Anonymous, post #18281976]

Can the code lock trigger my gate without adding mains power?

Yes. Many gate or door controllers accept a dry-contact trigger. Wire the keypad’s COM and NO across the controller’s trigger terminals. The keypad will short those terminals momentarily on valid entry. Do not feed voltage from the keypad into the controller input. [Elektroda, Anonymous, post #18282147]

Can I open the strike from both my intercom and the keypad?

Yes, if you manage the power and control paths correctly. Let the intercom provide the strike’s power. Use the keypad relay to switch that same supply to the strike. Avoid backfeeding between systems; follow each device’s wiring diagram. If unsure, consult a qualified installer. [Elektroda, Anonymous, post #18282063]

The relay clicks but the strike doesn’t open—what should I check?

Verify the strike’s supply is routed through COM–NO/NC, not directly to the strike. Confirm the strike type matches wiring logic (fail‑secure vs fail‑safe). Check PSU voltage under load and polarity for DC strikes. Bypass the relay briefly to confirm the strike actuates on power. If it opens on bypass, the issue is in the control wiring. [Elektroda, Anonymous, post #18282042]

How much current do electric strikes usually draw?

Example: Adams Rite 7100 series draws about 250 mA at 12 VDC. Size your power supply with margin and include all loads on the line. Higher current draws can cause voltage sag and misoperation if the PSU is undersized. [Adams Rite 7100 Series Datasheet]

Which should I use: NO or NC for my strike (fail‑secure vs fail‑safe)?

Use NO for fail‑secure strikes (power to unlock; stay locked on power loss). Use NC for fail‑safe strikes (power to lock; unlock on power loss). Edge case: A fail‑safe strike on NO will drop security during outages. Match wiring to your safety and security policy. [ASSA ABLOY: Electric Strike Basics]

How can I test the AC‑30C7 relay outputs safely?

Set your multimeter to continuity or ohms. Place probes on COM and NO. Enter a valid code; you should hear a click and see continuity. You will not read voltage on those terminals because they are dry contacts. This confirms the relay is switching. [Elektroda, Anonymous, post #18281990]

Can the keypad and strike share the same 12 VDC power supply?

They can, if the PSU has adequate current and clean distribution. Account for strike inrush and keypad load. Many installers prefer dedicated access supplies for reliability and to isolate inductive loads. Add suppression across the strike to reduce interference. [Altronix Access Power Considerations]

What do NO1/NO2 and COM1/COM2 actually represent on the AC‑30C7?

They are two independent relay outputs with common (COM) and switched contacts (NO/NC). Each output controls a separate load, like a gate input or an electric strike. These contacts do not produce voltage; they only connect or disconnect an external circuit. [Elektroda, tedeo1, post #18281939]

How do I protect the keypad relay from inductive kick when switching a strike?

For DC strikes, add a flyback diode across the strike coil (band to +). For AC strikes, use an RC snubber rated for mains or the strike voltage. Suppression reduces arcing, extends relay life, and limits EMI on shared power lines. [ON Semiconductor: Inductive Load Flyback Protection]
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