06-2023 dormakaba Canada Inc. RAC5 MFC Installation Guide – PK3738 | 12
4. Relay Expansion Board Configuration
Configure Relay Output SW4
The relay expansion boards are factory configured to a fail secure mode by
default. In the fail secure mode, Switch 4, on each relay expansion board,
is set to Relays OFF. In this mode the relays are normally OFF in the idle
state after power up. When the proper credential is presented to the
reader the coordinating relay will turn ON and activate accordingly. If the
system loses power or the Access Override (J18) is activated, the relays
will remain OFF. In this situation, the elevator buttons will no longer be
available to the user unless the master elevator controller grants access
outside of the dormakaba system.
To reconfigure the system to a fail safe mode, power off system and set Switch 4 on all relay expansion
boards to Relays ON.
In the fail safe mode, Switch 4, on each relay expansion board is set to Relays ON. At the next power up,
all relays will be normally ON in the idle state at power up. When the proper credential is presented the
coordinating relay will turn OFF accordingly. If the system loses power or the Access Override (J18) is
activated, the relays will switch states and turn OFF. In this situation, all buttons in the elevator car will
be available to the user without the requirement of presenting a credential to the reader.
NOTE: All relay expansion boards must be configured the same. If the relay expansion boards are
configured differently (one set to Relays ON, another set to Relays OFF) the system will not function
properly. The system must be power cycled for the configuration change to take effect.
5. Relay Expansion Board Switch Selection
Each REB is factory configured to have a unique ID. If service to a
REB is ever required, ensure to set the switch to the same ID of the
PCB you are replacing.
6. Wire relay expansion board outputs. Refer to Annex B for sample wiring diagram.
The relay expansion board provides 8 relay contacts for wiring and control of relay-enabled elevator. The
board only provides normally open or normally closed dry contacts, so no power is provided by the
board.
Up to 8 expansion boards can be used for total control of 64 floors (secure stops). The relay outputs are
at the wiring input of each three-terminal connector (1, C, 3) on the expansion PCB as well as being
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