4101-2 Controller Installation Handbook
5-6
Relays (for door lock mechanisms)
The relays each have three terminals: Com (common), NO (normally
open) and NC (normally closed). The relays are electrically isolated
from each other and from everything else. Each relay can be
connected to a power supply of maximum 30V AC or DC passing a
maximum current of 2A.
Module Function
NC Normally closed contact
Com Common
NO Normally open contact
Using a relay to switch inductive DC loads
If you are using a relay to switch an inductive DC load, such as a
mag lock, we recommend that you fit a suppression diode across the
load as shown in the following diagram.
Mag lock
Power supply
NO
NC
Com
-+
If you don’t do this, the relay may wear out quickly due to arcing
across the contacts. Use a diode such as IN4001 and make sure you
connect it so it is not conducting when the lock is energised.
Door open and door exit control (egress) inputs
Each door open monitoring input should be wired to a switch whose
contacts are shorted when the door is closed.
Each door exit control input should be wired to a normally open
pushbutton switch mounted next to the door on the secure side.
When the input is shorted, the relay is activated for the relay time.
Module Function
DO Door open input - normally shorted to ØV - open circuit to activate
ØV ØV
EG Door exit control input (egress) - short to ØV to activate
Note that the DO connection is next to the NO connection on the relay
- do not confuse it with the DØ data connection.
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