MCT-302 + Deurbel = probleem

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Jeffrey
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MCT-302 + Deurbel = probleem

Post by Jeffrey »

Ik wil de deurbel monitoren via het 2e contact (E.O.L. mode) van een Visonic MCT-302T module. Het probleem is echter dat na het aansluiten de MCT in de stress schiet en continu meldingen (alert/restored) gaat sturen. Dit ligt aan de manier van aansluiten. Ik vermoed dat het komt door een spanning die op de bel staat komt, echter heb ik geen idee hoe ik dit moet oplossen.

Bijgevoegd is een overzicht van de MCT302 EOL aansluiting, de dipswitchsettings (rood is hoe deze is ingesteld) en hoe ik het geheel heb aangesloten. Verder heb ik de RFX Reciever log bijgevoegd.

De eventuele handleiding van de deurbel is hier te vinden --> http://www.friedland.co.uk/Documents/EN ... s/D526.pdf

Waarschijnlijk is deze vraag een eitje voor de doorgewinterde electroguru, dus ik hoop dat jullie mij kunnen helpen [:D].

Image

PowerCode Addr:********** No Tamper,Alert,Battery-OK ,Event,Restore reported ,Primary contact bits=36 from SLAVE
PowerCode Addr:********** No Tamper,Alert,Battery-OK ,Event,Restore reported ,Primary contact bits=36 from SLAVE
PowerCode Addr:********** No Tamper,Alert,Battery-OK ,Event,Restore reported ,Primary contact bits=36 from SLAVE
Jeffrey
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MCT-302 + Deurbel = probleem

Post by Jeffrey »

Even als aanvulling. Wanneer ik de spanning van de beltrafo afhaal, dan werkt alles naar behoren.
mo046
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MCT-302 + Deurbel = probleem

Post by mo046 »

De MCT heeft een interne spanningsverzorging op de AUX. Dit levert een bepaalde spanning over de AUX-aansluitingen in commbinatie met de 47 kOhm weerstand (spanningsdeler). Zodra de gemeten spanning op de AUX-aansluitingen anders is, bijvoorbeeld doordat een schakleaar in dit circuit geopened wordt (kan ook een inbreker zijn die de kabel doorknipt!) dan meldt de MCT een Alert.
Wat jij met je beltrafo doet is ook de spanning verstoren (8 volt wisselspanning), waardoor je continu alerts veroorzaakt.

Je moet een wisselspanning-relais gebruiken om de MCT te triggeren, of een elektronische schakeling die hetzelfde doet.

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TANE
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MCT-302 + Deurbel = probleem

Post by TANE »

Tweede probleem die je krijgt is als er kort wordt aangebeld zal de MCT dit niet doorgeven.
Jeffrey
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MCT-302 + Deurbel = probleem

Post by Jeffrey »

Excuse me Pieter, your absolutely right.

I understand that I need a relais in between. Thank you all very much for the responses.

p.s. what a hell to find a 8vac relais at Conrad. Does anyone have any tips how to find one?
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MCT-302 + Deurbel = probleem

Post by mo046 »

Maybe you could use a phase bridge (gelijkrichter) and a 78L05 voltage regulator. Then you can transform 8V AC to 5V DC. Then connect a 5 V relay to it and you're set. More info (in dutch) on http://www.circuitsonline.net/circuits/view/30.

** Maurice **
Kroonen
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MCT-302 + Deurbel = probleem

Post by Kroonen »

With that schema without the 7805 and only the first elco, you get around 12v dc, and you can use a 12V relais, and that works, thats how I solved it.
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Willem4ever
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MCT-302 + Deurbel = probleem

Post by Willem4ever »

Misschien overkill, maar aangezien microcontrollers bijzonder goedkoop zijn (onder de euro) ben ik van plan om iets hier mee te maken je kan dan de uitgangs puls eenvoudig manipuleren bv de bel altijd even lang laten bellen .... iemand interesse ....

Perhaps a bit of overkill ... microcontrollers (MC9S09QG8) come really cheap nowadays. I'm toying with the idea to create something simple and create a long enough pulse for the MCT. Addionally you can control the length of the doorbell signal as well. My current setup uses two relays and is dropping short rings as well.

Let me know if there is interest.
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Rene
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MCT-302 + Deurbel = probleem

Post by Rene »

I am definitely interested. Currently I am using the IPPower to catch any doorbel rings. But in my current solution I miss very short rings because the pulse is not long enough to trigger the IPPower digital input.

Rene.
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MCT-302 + Deurbel = probleem

Post by Jeffrey »

I've made a shoppinglist based on kroonen his input:

1x 12VDC Relais (1 NO contact)
(http://www.conrad.nl/goto.php?artikel=502946)
1x Radiale elco 35V 2200F
(http://www.conrad.nl/goto.php?artikel=446210)
4x Siliciumdiode 1N4002 100V 1A
(http://www.conrad.nl/goto.php?artikel=162221)

It is interesting to see that most relays have a changecontact (wisselcontact) instead of a NO/NC. It was hard to find a version with a NO contact. NC would be better, but I was unable to find one .

Can someone tell me if it will work with the proposed components?

Also Willem his idea can be incorporated. Sounds great Willem!

<changed: translated to English>
Jeffrey
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MCT-302 + Deurbel = probleem

Post by Jeffrey »

Willem --> Is there any progress on the pulse-time-enlargement schema?
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MCT-302 + Deurbel = probleem

Post by mo046 »

I found this other application of the MCT-302 where the pusher is connected directly to the MCT-302 with a 47 kOhm resistance, and the doorbell functionality of the Powermax is being used.
Not quite a solution for application in the firts post, but I thought it could be interesting for someone else.
Link (in dutch only): http://www.becu.nl/vragendisc/Nieuwsbrief%20Deurbel.htm

** Maurice **
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MCT-302 + Deurbel = probleem

Post by mo046 »

Conrad has a new time relay on offer that can do the job.
http://www.conrad.nl/goto.php?artikel=506666
The input voltage ranges from 10.8 to 265 V AC or DC, so with a 12 V doorbell system it should work. For 8V systems maybe a separate 12V supply for the doorbell knob and relay input may be used, the relay then switches the 8V AC for the bell.
I don't know how stable 8V supplies are, and how sensitive the bells are for overvoltage, but maybe they could produce the 10.8 V minimun input voltage of the relay.
It has a lot of timing options, of which the delayed switch-off might be very usefull to generate long enough pulses for your domotica interface (MCT-302) to detect the pulse.

** Maurice **
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