
5.4.3 Connecting the relay
1. Fail safe lock
2. Fail secure lock
N.O. (Normally Open): A control signal closes the circuit.
N.C. (Normally Closed): A control signal opens the circuit.
Take care of the direction of the diode.
Make sure to install the diode near to the door lock.
Make sure to use different power supplies for the BioLite Solo and the door lock.
Make sure to install the diode at both ends of the circuit as shown in the figures above (and
below) in order to protect the relay contact from the reverse current that occurs when the
door lock works.