Ancillaries - Door Control
The use of electric door locking is often a requirement for Access Control systems, and the use of electric door holders for Fire doors is a frequent need. The control of these doors can present difficulties for the fire evacuation plan, and the Failsafe Door Control Module has been designed to overcome these problems.
Access Door Control
The use of electronically-controlled doors often presents problems with the emergency evacuation of buildings. For example, exit doors from an area may be controlled by the Access Control system, or may be fitted with electric lock release mechanisms.
In many installations, the Fire Detection system is linked to these doors, so that when an alarm occurs which might require that door to be used as an emergency exit, the electric lock is overridden, and the door can be used.
Fire Door Control
A similar approach can apply to Fire Doors. These are often designed to be held open (commonly by electro-magnets), to allow easy movement around a building. In the event of a fire alarm, these doors should be closed to prevent the spread of smoke and flames. The Fire detection system will release these doors when needed.
Addressable Systems
Where the fire system uses an addressable protocol, the command to release the doors can be sent using a loop output module. This has cost benefits, and gives programming flexibility, releasing only the doors which are needed in each particular situation. A well engineered system will take account of the possibility of a power failure, and will cause these doors to be set to the unlocked state during such time.
Failsafe Door Release Unit
The PSS module has been designed to operate as a standard programmable output module, releasing the fire door or unlocking the exit when commanded. It also has a failsafe operation such that in the event of a panel failure, the output will release automatically if the address is not polled for 60 seconds.
Compatibility
The module is compatible with the Apollo XP95 protocol, and can be used on any control panel which supports that protocol. The unit takes one address.
Status Indication
The unit includes LEDs to show whether the door is secured (i.e. locked, or held open) or un-secured.
Manual override
The unit also has a manual override (keyswitch or rotary switch), which will unlock or release the door if it is locked, and can also lock the door if it has been incorrectly released.
Remote Switching
The control and indicator plate may be fitted remotely from the module, onto a single-gang backbox.