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satellite ca-4 and SL-550 siren. Continuously howls after power is applied.

ggmarszal 5415 16
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Why does my alarm siren start howling continuously as soon as I power up the Satel CA-4 system, and how should it be wired correctly?

The siren is likely wired incorrectly: the OUT output provides a constant plus, while the minus appears only when the detector is activated, so connecting the siren to a constant + from OUT will make it sound all the time [#16682693] Use the outputs intended for siren control, and do not confuse them with AUX; OUT can supply up to 1 A, while AUX is only 400 mA [#16683295] The CA-4 also expects the line to be properly loaded: if OUT2 is unused, put a 2.2 kΩ resistor between + and - on that output, otherwise the keypad can report a fault [#16686517] The same 2.2 kΩ EOL value is mentioned for CA-4 inputs/outputs, so unused lines should not be left completely open [#16686855]
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  • #1 16682065
    ggmarszal
    Level 9  
    Posts: 31
    Rate: 9
    Hello!
    I am trying to connect the following set at home: Satel CA-4 alarm control panel, SATEL CA-4VKLED keypad, Paradox Security Systems PRO + PIR detector and SL-550 siren.

    The question is - where did I go wrong? After connecting the power supply, the alarm is activated immediately.
    Below I am adding a diagram showing how I connected the whole thing.
    I will be grateful for your help.
    Best regards!
    Attachments:
    • satellite ca-4 and SL-550 siren. Continuously howls after power is applied. schemat.jpg (86.45 KB) You must be logged in to download this attachment.
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  • #2 16682146
    suworow
    VIP Meritorious for electroda.pl  
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    ggmarszal wrote:
    After connecting the power supply, the alarm is activated immediately

    Does he arm himself or just howls?
    As for the latter, I suggest you follow the advice of my colleague @sharp on this topic:
    https://www.elektroda.pl/rtvforum/topic3294935.html#16198913
    Does a colleague already understand?


    ps1. as part of the rematch, can a colleague tell me how to build an alarm system based on one sensor?
    ps 2. is 230 for the control panel AC terminals in the attached diagram, as I understand it, such a "mental abbreviation" ;)
    ps3. who sells these "kits"?
    ps4. Due to the available free lines, it may be worth dividing the tamper line into two circuits. By the way, a colleague will have the opportunity to parameterize them.
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  • #3 16682249
    ggmarszal
    Level 9  
    Posts: 31
    Rate: 9
    He just yells, but I think I understand. It should be ok now right?

    The set was bought on the Allegro. As for 230VAC - a mental shortcut (slightly incorrectly described). There will be more sensors. At the moment, I want to connect it on the table before I start the final assembly, so only one sensor for now.
    Attachments:
    • satellite ca-4 and SL-550 siren. Continuously howls after power is applied. alarm2.jpg (81.1 KB) You must be logged in to download this attachment.
  • #4 16682269
    suworow
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    Let's check on the table ;)
    Does your friend know what was going on?
    best regards
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  • #5 16682693
    ggmarszal
    Level 9  
    Posts: 31
    Rate: 9
    I will check everything over the weekend and I will be smarter, but so far I know that the TR + and TR- trigger inputs are independent of each other and it is enough to control one of them.
    And here is my conclusion (to be checked with a meter): there is a constant plus at the OUT output, and a minus appears in the event of detector activation. So, at the original connection, the siren was triggered with a constant plus from the OUT output.
    I just don't know why + 12V is pulled to the siren from OUT + and not from AUX and if it makes any difference.
  • #6 16682822
    marek216
    Level 43  
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    Colleague @suworow he asked you to reveal his secrets, and I will ask you because you did not answer.

    Why, instead of connecting a detector in the 2EOL / NC system, and the keypad and siren as NC on separate lines (because of trouble these two tampers together, if there is to be more PIR), you let the detector, keypad and siren be tampered with in one line.
    Can you guess where the sabotage will come from when it hits it somewhere?
  • #7 16682919
    Anonymous
    Level 1  
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  • #8 16682979
    marek216
    Level 43  
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    fakerus wrote:

    After all, CA4 only has EOLs.


    My mistake - this old man is actually a little lame.
  • #9 16683024
    ggmarszal
    Level 9  
    Posts: 31
    Rate: 9
    marek216 wrote:
    Colleague @suworow he asked you to reveal his secrets, and I will ask you because you did not answer.

    marek216 wrote:
    Can you guess where the sabotage will come from when it hits it somewhere?


    What secrets? What did I not answer? At the moment, I want to connect the detector, control panel, keypad and siren so that I know how it all works. The alarm itself will be located in the basement. Ultimately, 3 detectors. Actually, I don't need to know where the sabotage came from, because the whole system is not complicated and I can check it myself. I just want the siren to sound in the event of a break-in, although I will probably try to make the whole thing optimally.

    marek216 wrote:
    Then who made this wiring diagram you? Is a shop assistant.


    I drew the diagram myself. It's the first time I connect the alarm.
  • #10 16683295
    Anonymous
    Level 1  
  • #11 16683417
    suworow
    VIP Meritorious for electroda.pl  
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    Gentlemen, I suggested a bit, I directed the author, and allowed myself to ask a few questions, which he also deigned to answer ;)
    With this sabotage, @ marek216 is right. Unfortunately, it is often the case; "comes and goes and disappears ......" and sing along to the rest :) . But the "headquarters" has such and no other possibilities and we will not skip this in this case. A bit tempting ... but the seller on the stock portal will not tell us.
    ggmarszal wrote:
    . The alarm itself will be located in the basement. Ultimately, 3 detectors.

    A large basement or such saturation? It is a pity that there was no place for a reed switch.
    A colleague allows the thought of connecting a second signaling device (only acoustics) inside. In my opinion (and not only mine :) ) worth it ....
    ggmarszal wrote:

    I drew the diagram myself. It's the first time I connect the alarm.

    And for the first time, it's pretty good. For example, my colleague was able to find out how the high-current out in satellite switchboards works with what, which is not always so obvious for the more experienced.





    ps. a colleague will read ps4 again and make a correction to the diagram ;)
  • #12 16686496
    ggmarszal
    Level 9  
    Posts: 31
    Rate: 9
    The basement is quite big and some rooms have windows.
    I will divide the tamper line into two circuits when it even starts working for me. At the moment, I connected according to the last diagram. After power-up, the keypad signals a failure. I checked the type of failure and according to the operating instructions it is: damage to the F3 fuse or the signaling device circuit connected to the OUT2 output. The trouble is that I have nothing connected to this output, and the fuse is functional. Anyone know why this failure could have occurred?
  • #13 16686517
    Anonymous
    Level 1  
  • #14 16686544
    marek216
    Level 43  
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    ggmarszal wrote:
    The trouble is that I have nothing connected to this output, and the fuse is functional. Anyone know why this failure could have occurred?


    The manual knows. Read it carefully - you may have more such flowers.
  • #15 16686839
    suworow
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    ggmarszal wrote:
    I checked the type of failure and according to the operating instructions it is: damage to the F3 fuse or the signaling device circuit connected to the OUT2 output

    And I wrote about the second signaling device :)
    ggmarszal wrote:
    I'll divide the tamper line into two circuits when it even starts working for me

    Well, probably my friend will not share it :)
    ggmarszal wrote:
    Ultimately, 3 detectors.

    best regards
  • #16 16686855
    Anonymous
    Level 1  
  • #17 16686893
    suworow
    VIP Meritorious for electroda.pl  
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    fakerus wrote:
    it is the same with "exits

    You mean there are four of them? ;)
    But it's not easy to be a bhtom :) I have been trying for a long time to make the author realize that one signal in this type of system is not enough, but you can write there ...
    And now, when he knows that you can clog this output with a resistor, it's a sure loss :(
    best regards
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Topic summary

✨ The discussion revolves around troubleshooting a Satel CA-4 alarm system, specifically addressing the issue of the SL-550 siren continuously howling after power is applied. The user connected the Satel CA-4 control panel, CA-4VKLED keypad, Paradox PRO + PIR detector, and SL-550 siren but encountered immediate alarm activation. Responses suggest checking the wiring, particularly the OUT output, which may be incorrectly connected to a constant voltage instead of being triggered by the detector. Recommendations include using a resistor to load the output and ensuring proper tamper line configurations to avoid false alarms. The user also noted a failure signal from the keypad related to the OUT2 output, despite no device being connected to it, prompting further investigation into the system's wiring and configuration.
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FAQ

TL;DR: If your SL-550 howls right after power-up on a Satel CA-4, check wiring and loads: OUT is 1 A, AUX 400 mA; “use the outputs adapted to control the siren.” [Elektroda, Anonymous, post #16683295]

Why it matters: Correctly wiring triggers, power, and EOL loads prevents false alarms, failures, and fuse warnings in small CA-4 builds.

Quick Facts

Why does my SL-550 siren howl immediately after I power the CA-4?

It’s usually miswired triggering. The CA-4’s alarm output provides a negative trigger, and the SL-550 TR+ / TR− are independent. If you feed constant +12 V and present ground on trigger, the siren starts immediately. Rewire to match negative trigger logic and correct polarity. [Elektroda, ggmarszal, post #16682693]

Should I power the siren from OUT+ or AUX on the CA-4?

Use OUT+ for the siren. OUT provides about 1 A current capability, while AUX is about 400 mA for low‑draw devices. As one expert noted, “use the outputs adapted to control the siren.” This avoids brownouts and nuisance alarms. [Elektroda, Anonymous, post #16683295]

The keypad shows failure: F3 fuse or OUT2 siren circuit, but nothing is connected. What now?

Load the unused output. Fit a 2.2 kΩ resistor between OUT+ and OUT− on that channel. The CA‑4 supervises this circuit and expects a load; without it you’ll see a fault. Clear trouble after installing the resistor. [Elektroda, Anonymous, post #16686517]

How do I wire the SL-550 trigger correctly to a CA-4?

Provide +12 V from OUT+ to the siren’s V+, and use the CA-4 open-collector negative alarm output to the siren trigger (TR−), with TR+ at +12 V. Ensure grounds are common. This matches the CA‑4’s negative trigger behavior. [Elektroda, ggmarszal, post #16682693]

What resistor value do CA-4 zones need for EOL?

Use 2.2 kΩ per zone. The CA‑4 reads each of its four inputs through a 2.2 kΩ EOL for supervision. If a zone is unused during bench tests, install the same resistor to keep the panel happy. [Elektroda, Anonymous, post #16686855]

Does the CA-4 support 2EOL/NC on zones?

No. The CA‑4 supports single EOL on zones, not 2EOL/NC. Plan your detector wiring accordingly and supervise tampers separately when possible. [Elektroda, Anonymous, post #16682919]

Should I combine all tamper loops into one circuit?

Avoid one big tamper loop. Split keypad and siren tampers so you can identify which device is opened or cut. This improves diagnostics during service and after an event. [Elektroda, suworow, post #16682146]

What is EOL, and why does it matter here?

EOL (End‑Of‑Line) is a resistor at the end of a zone loop that lets the panel detect open, short, or normal states. On the CA‑4, typical EOL is 2.2 kΩ per input. It maintains supervision even when testing on a bench. [Elektroda, Anonymous, post #16686855]

Table test: how can I safely bench‑test a CA-4 with one PIR and one siren?

  1. Power the panel and keypad on a table with proper AC/DC supply.
  2. Install 2.2 kΩ EOLs on unused zones and load any unused OUT with 2.2 kΩ.
  3. Wire the PIR and siren using negative trigger logic, then arm and trip the PIR. “Let’s check on the table.” [Elektroda, suworow, post #16682269]

What does the SL-550 TR+ / TR− labeling mean?

They’re separate trigger inputs. The CA‑4 provides a negative trigger on alarm, so connect TR+ to +12 V and drive TR− low from the panel’s alarm output. This prevents continuous howling. [Elektroda, ggmarszal, post #16682693]

Edge case: What happens if I leave OUT2 unused without a load?

You’ll get a failure indicating an OUT2 or F3 issue. The panel supervises the output path. Install a 2.2 kΩ resistor across OUT2 to satisfy supervision when no device is present. [Elektroda, Anonymous, post #16686517]

Can I know which device caused a tamper if all tampers are in one loop?

No. One loop hides the source. Split tamper circuits so you can identify keypad versus siren intrusion. This speeds repairs and improves event analysis. [Elektroda, marek216, post #16682822]

What is a reed switch, and should I add one in the basement?

A reed switch is a magnetic door/window contact. It detects opening without motion. Adding one protects windows or doors and complements PIRs in large basements with multiple entries. It was specifically suggested as useful here. [Elektroda, suworow, post #16683417]

Statistic: How many supervised inputs does the CA-4 provide?

Four. Zones Z1–Z4 each use a 2.2 kΩ EOL for supervision during normal, open, or short states. Plan sensor coverage accordingly. [Elektroda, Anonymous, post #16686855]

Quick fix: My siren still howls—what 3 checks should I do first?

  1. Confirm TR+ is at +12 V and TR− is the panel’s negative alarm output.
  2. Move siren power from AUX to OUT if current draw is high.
  3. Add 2.2 kΩ load to unused OUTs to clear supervision faults. [Elektroda, Anonymous, post #16683295]
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