CDVI Internal Mortice Magnetic Lock, Monitored, Up to 400kg, 12/24Vdc V4ER

What this lock is for

A maglock keeps a door shut with an electromagnet and a steel armature plate, the flat plate the magnet pulls against. Most magnetic locks are bolted onto the surface of the frame.

This CDVI lock is different because it is recessed. It suits a job where a surface-mounted unit would look out of place, and where the door head has room for it.

How it works

• The lock: power goes to the magnet and the door is held. Remove the power and the hold ends. In the trade, that behaviour is called fail safe.
• The status signal: COM, NO and NC stand for common, normally open and normally closed. Your controller or alarm reads these contacts to see the lock status.

Where to use it

This is an internal flush lock, so plan on indoor doors in dry areas. Office doors, shop doors and internal lobby doors with a transom above are the kind of opening to think about.

If the door is on an escape route, the lock is only part of the job. Agree how it will release with whoever holds the fire strategy.

What the figures mean in practice

• Holding force: this is the straight pull needed to part the plate from the magnet. It is an upper figure, and the frame still has to take the load.
• Current: the magnet draws power all the time the door is locked. Add this load to anything else on the supply, and remember the current halves when you select the higher voltage.
• Stainless steel: the material is high grade stainless steel. That does not make it an outdoor lock, which the rating below settles.

Installing it

• Check the recess first: measure the transom or housing against the lock's dimensions before you order, because a recessed lock leaves little room to adjust later.
• Select the voltage: the unit is selectable, so set it to match the supply before you power it up.
• Alignment: the plate needs to sit flat against the magnet. A door that has dropped on its hinges can lose a lot of holding force.
• Testing: with the door shut and the lock powered, confirm the status contacts change as you expect, then confirm the door releases when power is removed.

Planning your system

The lock does not decide when to open. You will also need a door controller or keypad to switch it, and a power supply sized for the load.

An exit button and an emergency door release are the usual additions on a controlled door. Check fit against your own door.

Ratings explained

• IP42: the 4 means protection against solid objects over 1mm. The 2 means protection against dripping water when tilted, which is why a dry indoor position is the right home for it.