Gate control and intercom - fuse blown but why?

[Phantome46]

I have just purchased a new video intercom system which consists of an outdoor unit with key pad, camera and RFID access and then a 7 inch internal monitor.

The monitor is connected with a 12v transformer plugged into the wall and then an RJ45 Ethernet cable running back into my home network switch.

The outside Bell unit is POE from my POE switch and this then runs through the network switch.

Outside unit powers up not a problem and then from inside you are able to view the camera and also talk to outside.

I had a few issues initially getting the wiring from the doorbell intercom right as I needed a NO and Com

connection into the gate controller to trigger opening.

I have attached the initial wiring diagram as reference.

I tested all of the wires and in order to get the Yellow wire NO and Green (COM) to function correctly and switch was to join the Brown per infant 12V feed and then the yellow together - this cable when into one side of the gate control module

The green went into the other.

Initially i enter the code on the intercom and bingo the gate opens and then after 30 secs closes again.

I then tried it from inside and it worked a few times but all of a sudden the gate stopped and I lost control.

I went to the motor to test it and looked and I’ve blown the 250V 1.6A T glass fuse. Very strange.

My guess is i have a connection that is incorrect - but as a DIY guy with a little bit of knowledge I am now out of my depth.

Anyone shed some light on the issue?

 

[Lucien Nunes]

The gate motor probably wants a volt-free contact closure by the intercom, but it sounds like you are sending the intercom's 12V feed into it, which could fry it. Exactly what problems this would cause depend on the polarity of the control input relative to the intercom 12V, and where and through what resistance either end is grounded.

I would disconnect the gate from the intercom, replace the fuse, test whether the gate can be correctly triggered by a closure of the input. Then, separately, test the relay output of the intercom to prove that the N/O contact is closing and that it is volt-free and floating relative to ground. Only then, connect it back up to the gate.