Underground car park entrance - SmartRelay 3 system

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, do not have an identification medium. The exterior part is also not 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 SREL3 ADV system 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 variant is visible on the outside and makes it easier for users to place their identification medium onto the reader. The read range is better compared to a reader fitted inside an existing housing. The protective housing (SREL2.COVER1) ensures protection against the weather, 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.

No-one can manipulate the data since communication is secured from the reader to the controller and to LSM. When the data reach the controller, the controller evaluates them. If there is a virtual network and connection to LSM (Ethernet), the latest information is retrieved using the identification medium; if not, the system used the last status saved internally. Depending on the result of the evaluation, the controller triggers the required action, such as actuate a relay.

If a virtual network is used, the system is ideal for use as a gateway. The underground car park entrance features a locking device which is heavily used. This means that each identification medium used here is verified on the reader and, consequently, in the LSM database via the controller. Authorisation changes, IDs to be blocked and time budgets are thus efficiently managed.

The controller can be powered either via an external power supply unit or via the network line. The controller, in turn, can power the reader. If the voltage drop is too great, the reader can also be supplied by an external power supply unit (see External power supply).

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.

See Connecting one or more readers and Connecting one or more buttons on wiring.