Help Needed: Issue with Dahua VTO2202F and BFT A400 Gate Opener

[yangli]

Hi everyone,

I recently installed a Dahua VTO2202F intercom as an outdoor station and connected it to my gate opener motor, a BFT A400, following the manual's instructions. However, I've encountered a strange problem.

Every day, at around 12:03 PM, my gate mysteriously opens by itself. After a short while, it either closes again or sometimes stays open for a long time before closing.

Upon investigating, I noticed something unusual:
Under normal circumstances, the indicator light on my gate opener’s control board lights up when the COM and NO terminals are connected, signaling the motor to open or close the gate. However, after connecting the intercom (VTO) to the opener, the indicator light on the control board faintly glows instead of lighting up fully. This suggests there’s a weak current between the COM and NO terminals even when no signal is being sent.

I suspect this might be related to the issue of the gate opening and closing on its own. Has anyone else encountered a similar problem or know how to resolve this?

Any advice or insights would be greatly appreciated!

Thank you in advance!

 

[ImTryin]

Not sure if this is the same but am sharing as it may help.

I had a similar problem on my Dahua VTO3221EP with randomly opening gates with an Italian SEAV LR2151 gate controller (which has been bulletproof for 20 plus years). In the middle of the night (usually between 2am and 5am for maximum annoyance to me and my neighbours!) the gates would continuously open and close for hours until I turned the power off. I checked this forum without luck. My experience was this.

I noticed with a multimeter that the voltage passing through the contact button on the SEAV was 28V AC during the day when the VTO was reliable and not playing up. But in the middle of the night the current increased over 30V sometimes over 31V. Input voltage from the grid increased from around 230V to around 250V at night which was obviously causing the ironcore transformer the to create the extra voltage. My thoughts were that the 30V plus was too much for the small relay in the VTO to handle - possibly arcing the relay and keeping it continually open or pressed. I have not been able to find specifications for maximum voltage of the VTO relay but that was my hypothesis.

To solve the problem I installed a separately powered 5V relay in between the VTO and the gate controller as a contactor to test if this was the problem. It appears to have worked and I am not getting random openings of the gates at night for a few days now. I will ultimately buy a proper din rail mounted contactor once I am sure that the relay solves the problem. But for the moment that is my experience. I will update if there is any change.

Your BFT appears to be 24V DC so slightly different but maybe your issue may be the same - especially given DC is more prone to arcing the relay and causing contact. I’d be interested to hear if anyone knows the specifications of the relay in the VTO.

Thanks and Good Luck.