Automatic two door relay for Video systems
- Customer pickup,
- Courier
- In detail
A bi-stable relay with two coils and a permanant magnet, so it will stay in either position indefinatly, untill switched the other way.
The terminals CBP1 & CBP2 (CBP=Common Bell Push) monitor the button feeds at both doors and switch over if required.
There are two 4 pole change over relays, a bistable one switches over; Speech to the door, Speech from the door and the third contact shorts out the internal sensing coil so that there is no current restriction to the bells.
The fourth contact then switches over the conventional second relay, which changes over, the lock button, the power to the camera and the video coax.
There is a terminal contact marked "Toggle" this can be conected to an extra button on the phone which gives the phone user the ability to overide and manually switch between camers / door panels, if this button is pushed and held, the relays will switch back and forth about twice a second. This feature would only be appropiate in control room or private house installations.
Also availble is a Audio version (99RU) without the "Toggle" feature.
Can be cascaded to serve 4 doors using 3 99VRU's maximum