Underground car park entrance - SmartRelay AX Classic

An underground car park entrance is a similar situation to an entrance barrier (see Entrance barrier) since anyone who wants to enter an underground garage from the outside must use the entrance. Some of these people, such as business customers, will not have an identification medium. The outer part is also exposed to the weather, vandalism and sabotage. The main difference is that an underground car park can be secured with elements such as roll-up doors to ensure unauthorised persons cannot walk through the entrance.

The underground car park interior can thus be regarded as a protected area.

The SmartRelay AX Classic can be used to provide a convenient underground car park control. As with all other use cases, the controller is installed in a protected area, such as the engineering room. A reader is also needed in front of the roll-up door, close to the entrance:

  • The reader is installed in a suitable position in an existing housing – in an existing intercom housing, for example. This variant is inconspicuous and offers effective protection against the weather, vandalism and sabotage.
  • The reader is fitted on the wall. This version is visible on the outside and makes it easier for users to position their identification medium. The read range is better compared to a reader fitted inside an existing housing. The anti-vandalism frame (SREL3.COVER) ensures protection against vandalism and sabotage.

The user can use their identification media to check authorisation while in the car. If the user does not have an identification medium, but is expected, they can still announce their arrival, using an intercom, for example. Another person who is in the protected area can then let the user in by pressing the connected button. The button can be installed in a gatehouse, for example, which only allows external customers to enter during business hours while users with identification media can come in at any time.

Users who wish to leave the underground car park are within a protected area. Consequently, there is no need to re-verify authorisation for the door. Greater convenience is provided by connecting one button in a parallel circuit with another button (in the gatehouse) and positioning it near to the exit within the protected area. The button can be conveniently operated from inside the vehicle using a pull cord.

Communication between the reader and the controller is encrypted and secured. This means that no one can tamper with the data. The data read is only processed and evaluated in the controller.

The reader can be powered by the controller and does not require a separate power supply unit in this case. Long cables or cables with excessively thin conductor cross-sections will cause a drop in voltage. Malfunctions may occur if the voltage drop becomes too great. See Information on cabling for details and possible solutions.

IMPORTANT

Manipulation of unprotected electrical connections

Unprotected electrical connections can be short-circuited or manipulated in another way.

  1. Install electrical connections from buttons to the controller within protected areas only.
  2. Install electrical connections from the controller to the contactor or the device being activated within protected areas only.