Digibell Vandal Resistant System Installationsanleitung PDF herunterladen (Seite 21)

Digibell Vandal Resistant System

PD-169 Issue 3B Installation Guide Page 21 of 56

the top and side edges of the front plate on the side touching the wall to prevent water

ingress behind the panel, but not the bottom edge. On construction sites the panel must be

protected from corrosive substances such as ‘brick acid’. The panel should be cleaned only

with a damp cloth containing dilute detergent.

Electric Door Release

Both fail-secure and fail-safe lock releases (including Maglocks) use the same terminals. To

change the lock type, refer to the ‘LOCK’ on page 24. When installing lock releases please

allow a little movement on the door, as operation will be impaired if fitted too tight or the

tongue of the lock extends too deeply into the lock release.

N.B. Magnetic locks (Maglocks) must be fitted with suitable transient voltage suppression

device at the Maglock. Some Maglock manufacturers fit an internal suppressor.

Entry and exit considerations

Most fail-secure exit doors incorporate a mechanical means of egress rather than an exit

button. Fire officers usually specify a door handle or push bar to open a door on a fire exit

route – not, for example, a thumb-turn.

Fail secure lock releases are not generally continuously rated however if the entrance needs

to be unlocked all day and the door entry system only used at night, then a continuously

rated release must be used.

Powered bolt, shoot-bolt, Shear lock or other more secure door locking systems may require

the use of a separate power supply and relay or a suppressor to be fitted.

A not uncommon problem with Maglocks, which cannot be mechanically overridden, is being

locked out of the building due to lost codes, fobs or equipment failure. So consider an

alternative building entrance, or an externally accessible secure key-switch, or a reliable

method of disabling the system during overnight secure lockup.

Exit Button input

The exit button input is used to unlock the door for the set time (default 3 seconds). The input

is designed for use with normally open push buttons.

‘Exit +’ terminal is the input/trigger and ‘Exit –‘ is internally connected to 0V.

The ‘Exit +’ input can also be used for connection to other equipment to open the entrance. It

is recommended that a relay is used to isolate/interface this connection when using third

party equipment.

Door Open Switch

The door open switch is used to provide an indication at the phone that the door has been left

open. This switch can have closed contacts when the door is closed or open contacts when

the door is closed; this selection is described in ‘Panel programming’. The default of ‘contact

open when door closed’ must be selected when this feature is not required.

Time Clock Sharing

In a large system a single time clock can be shared between distributed equipment areas by

borrowing one of the ‘commn –‘ wires in the interconnecting CAT5 to use as the shared ‘Time

clock common’. See the detailed diagram 12.

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