PRT-PX16-PCB
Protege 16 PGM Output Expander
Installation Manual | June 2017
17
5.2
Fail Secure Wiring
The fail secure mode of operation is provided as a solution to provide a high level of security to installations that
require NO access in the case of any failure. This is not recommended for use in modern installations.
The floor control relays must be wired using the NO and COM relay contacts as shown in the following diagram.
This will only allow access to a floor if the relay is activated. Deactivation of the relay or complete power failure
will PREVENT any access to the floor.
Floor
S
election Button
in Elevator Car
Floor Input Terminal
s
in Elevator Control
S
y
s
tem
Loop Terminal added by
Elevator Company
located in Elevator
Control
S
y
s
tem
Normal Connection
Removed
NC
NO
COM
RELA
Y 1
Fail Secure Floor Relay Wiring
i
Correct operation of the Fire Control input will not occur if using the fail secure wiring connection.
