Algo 3226 Betriebsanweisung PDF herunterladen (Seite 13)

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Door or Gate Control Basics

Door control contacts are provided from the Doorphone Controller and are

typically used for door strike activation or gate control. For security, the door

control relay is located in the Controller to avoid entry by tampering. The Door

Station dry contact output (OUT) may be congured for ‘low security’ gate

control requiring a low current dry contact.

Door Release

Door release typically involves energizing or de-energizing a door strike which

pivots to allow a locked door to open without retraction of the latch bolt. There

are two different types of door strikes:

• “Fail Locked” (or “Fail Secure”)

• “Fail Unlocked” (or “Fail Safe”)

24V 0.3A

Door

Strike

“Fail Locked”

24 Vdc 0.2 A Typical

24V 0.3A

“Fail Unlocked”

24 Vdc 0.2 A Typical

Fail Locked / Fail Secure Electric Strike

These require power to release and

remain locked during power failure. The

door may still normally be opened from the

outside with a key, or from inside without

a key. The door control relay is used to

apply power to release the door.

Fail Unlocked / Fail Safe Electric Strike

These (as well as magnetic locks), require

power to lock and become unlocked

during power failure. The door control

relay is used to maintain power to the

door lock (NC and C contacts) which is

interrupted to release the door. Magnetic

locks may require override systems to

allow safety exit in the event of re.

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Algo 3226 Betriebsanweisung Seite 13