This problem only happens at fail-save lock (magnet
lock and electric bolt lock), because electromagnetic lock do not have unlock
signal, engineer can only use power-off [Relay: NC/COM] to open the door, which
Connect a relay module
which is installed out of the controller.
Add one more capacitor
on the relay NC/COM points.
lock => Product is
electric strike lock. When the power is turned off, , the door will be locked.
This is used for warehouse.
Fail-save lock => Products are magnet lock and
electric bolt lock. When the power is turned off, the door will be unlocked.
This is used for public space. Depends on customer’s requirement, you can
choose UPS to prevent unexpected condition after power off.