Elevator Control - GE Security EST3 Installation And Service Manual

Elevator control

EST3 Installation and Service Manual
Description of the application
An access control system can determine which floors are
available to a given cardholder. This application is shown in
Figure 3-6.
A CRC and independent power source are installed in the
elevator cab. When a cardholder presents his card it is processed
by the CRC. If valid, the CRC sends an access granted event and
a command list request to the CPU via the 3-SAC.
The command list operates the Signature relay modules attached
to the Signature Controller module. The relays are connected to
the elevator controller, and turn on or off access to the correct
floors, according to the cardholder's access level privileges.
The command list includes timing, so the cardholder has a
limited window of opportunity during which he can press the
desired floor button. After the time has lapsed, he must present
his card again.
This application must be used only for floor access, and
Note:
not for elevator control.
Access control applications
3.21