16
PRT-PX16-PCB
Protege 16 PGM Output Expander
Installation Manual | June 2017
5
Elevator Floor Relay Connections
When using the Protege 16 PGM Output Expander as an elevator floor controller the relays can be connected in
either a normally open connection (fail secure) or a normally closed connection (fail safe). It is recommended that
the relays be connected in the fail safe operation and is mandatory if the installation is to comply with UL
specifications.
Fire Control operation will NOT operate when being used in a fail secure mode of operation and it is therefore
not recommended.
i
You must still supply a voltage to the fire control input to allow the floor control relays to activate
during normal operation. Refer to Fire Control Input (see page 12).
5.1
Fail Safe Wiring
The fail safe wiring connection is the most common interface method. By interfacing the floors that require
security to the normally closed connection of the relay as shown below the Elevator Controller will operate in a
fail safe mode Fire, Complete Power Failure or Communications Loss if enabled will still allow access to the
floors that are being controlled.
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 Safe Floor Relay Wiring
Connection is achieved by breaking the button input that comes from the elevator system and connecting either
end to the COM and NC connection for the appropriate floor relay.
Although you can break either side of the button wiring and it will provide the same functionality it is
recommended that the elevator company break the control signal and not the common for the button. This
method will allow a very simple migration to the destination reporting option if required in the future.
i
UL Installations MUST be wired according to the fail safe method.
For fail safe wiring connection to operate correctly the relays must be inverted. This is selected by
turning on the inverted relay configuration option in the reader expander configuration.
