42-02-4022 PRODUCT DESCRIPTION • 1-5
CAR OPERATION CONTROL (COC) - This functional block covers logical car operation and
safety monitoring. An example of logical operation would be operation of the doors and
response to hall and car call demands or special operations such as Inspection/Access, Fire
Service, etc. Additional special operations are provided as required per specifications.
The heart of the COC is the SC-SB2K Main Relay board, which makes it possible to move the
car without computers and satisfies code-required safety functions and redundant relay backup
functions. All computer functions can fail in an ON condition and the car will not move if the
door lock circuits are not closed. Except for calls, most of the individual elevator inputs and
outputs are handled through the Main Relay board and are routed to the HC-PI/O board, which
is the main interface to the computer.
Provisions for eight position indicator outputs are on the HC-PI/O board. If additional position
indicators are required, HC-PIX boards are added. If independent (walk-through) rear doors are
required, the HC-RD board acts as the interface between the computer and the Rear Door
Relay board, which handles all functions associated with the rear doors. Some additional inputs
and outputs, such as load weighers, are handled through the HC-IOX or HC-I4O board.
Hall calls are interfaced to the computer through the HC-CI/O boards which can handle up to
16 calls per board. Car calls are interfaced through the HC-CI/O boards or the MC-NC board
if the controller is equipt with the SmartLINK for Car Operating Panel option. Therefore, all the
input/output boards (HC-PI/O, HC-PIX, HC-RD, HC-IOX, HC-I4O, HC-CI/O and MC-NC) act
as the interface between the MC-MP2-2K Main Computer board and the user. These
input/output boards are linked to the Main Computer board through the ribbon cable attached
to the MC-MP2-2K board, which plugs into the HC-PI/O board. The Main Computer board
contains the main elevator logic program.
CAR COMMUNICATION CONTROL (CCC) - This functional block coordinates the flow of
information between the car controller and other equipment such as terminals, modems,
printers and the Group Supervisor in an M3 Group System.
CAR MOTION CONTROL (CMC) - Car Motion Control (CMC) develops the speed command
which dictates the car's speed. The speed signal is in the form of step input signals which are
applied to the drive unit. The drive responds to the commanded step inputs and runs the
elevator at predefined speed settings stored in the drive unit. The CMC also provides
Inspection/Leveling Overspeed (ILO) monitoring and Emergency Terminal Switch (ETS)
monitoring. These functions are covered by the following devices:
• HC-ACI-D Drive Interface board
• HC-ACIF Additional Flux Vector Drive Interface board
The HC-ACI-D board creates the speed command, controls the brake, monitors overspeed
conditions and is the interface between the COC, CPC and the power equipment such as the
brake, SCR Drive Unit and supporting devices.
CAR POWER CONTROL (CPC) - SCR DRIVE - Car Power Control (CPC) receives the
direction command and speed signal from the CMC and produces the necessary outputs to the
rotating equipment to achieve the desired elevator movement. The SCR Drive Unit receives the
direction(run) and speed command from the HC-ACI-D board, and provides the proper DC
armature voltage and motor field voltage to create the required RPM and torque in the motor.