The Verkada AC41 access controller is able to provide power to specific locks, as long as their in-rush current does not exceed 350mA at 24V or 700mA at 12V.
Use an external access power controller (APC) (Dry setup) when you wire up a crash bar.
Use an external APC (Dry setup) when you wire up an electromagnetic lock (maglock).
How the integration works
Use an APC
This option uses an external APC, such as the Altronix AL600ULACM (widely available in the US) or the Hfeng Access Control Power Supply Control Switch (available in EMEA, as shown below).
The AC41 runs dry (the toggle on the left side of the cassette is configured to None), and connects the NO and COM ports to IN and GND, respectively. (The IN port is sometimes labeled as PUSH, as shown above). The APC then uses its NC and COM ports to connect to the maglock.
Create a manual release in case of an emergency
Because maglocks are constantly powered, fault tolerance needs to be built in the system. This process permits an exit in case of any emergency, without relying solely on the system.
Install a Glass Break button, in the vicinity of the request to exit (REX), that you can smash in case of an emergency; effectively breaking the circuit and allowing for exit.
Required: You need to install this button in series with the APC and maglock.
Depending on local regulations, you might need to set up the fire alarm system to automatically drop power to the maglocks. To do this, wire the Fire Alarm Control Panel (FACP) Trigger Input in parallel with the AC41's own connections to the APC.
In the event of the FACP detecting a fire, you can configure it to set off the auxiliary relay (or series of relays), and instruct the APC to drop power.
Use a regular power supply
In case APC is not available, you can use a regular power supply unit (PSU), such as the Fortessa DC Boxed Switch Mode PSU, and an additional 12V/24V relay module (as shown below).
The required writing is shown below (note the Glass Break required for manual egress in case of emergency, if the system is not responsive):
AC42 and AC62 Considerations
Most of the recommendations listed in this article also apply to the second-generation controllers. However, the new AC42 and AC62 controllers come with terminal blocks (as opposed to cassettes), resulting in a much higher resistive load (2A at 24V or 4A at 12V). This means that you can use a regular PSU to power a lock up to 2A (at 24V), with an APC only needed over that limit. This is because it has a separate power relay that does not touch (thus damage) the access controller.
With this in mind, here are the 3 ways to power a lock using AC42 or AC62:
Power Lock Method
Locks under 350mA @ 24V
The controller powers them wet. No third-party device is required.
Locks between 350mA and 2A @ 24V
Use a regular PSU in series with the lock and AC unit (Glass Break recommended for NC circuits; see diagram below), or just a regular APC (as per the previous diagrams).
Locks over 2A @ 24V
Use an APC (just as you would for an AC41 running a lock dry).
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