42-02-2022 PRODUCT DESCRIPTION • 1-5
CAR OPERATION CONTROL (COC) - This functional block covers logical car operation such
as operation of the doors and response to hall and car call demands. This block also covers
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 SafetyRelay board), which 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. 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 and SC-HDIO board.
Provisions for eight position indicator outputs are on the HC-PI/O board. If additional position
indicators are required, HC-PIX boards are added as required. 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 for
Inspection/Leveling Overspeed (ILO) monitoring and Emergency Terminal Switch (ETS)
monitoring. These functions are covered by the following devices:
• HC-ACI AC Drive Interface board
• HC-ACIF Additional Flux Vector Drive Interface board
The HC-ACI 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, VFAC Drive Unit and supporting devices.
CAR POWER CONTROL (CPC) - VVVF 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 AC Drive Unit receives the
direction(run) and speed command from the HC-ACI board, and provides the proper 3-phase
voltage and frequency to create the required RPM and torque in the motor. It also provides for
the dynamic braking when it is necessary.