ABB ACS2000 User Manual page 41

c o n T r o l S y S T e m
—
AMC (Application and Motor Controller) circuit
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board
Location of AMC
circuit boards
The major component of the drive's control system
is the AMC circuit board. The AMC circuit board
is a digital signal processor for general drive
and motor control functions.
The drive control system has two AMC circuit
boards. The AFE (Active Front End) circuit board
and the INU (INverter Unit) circuit board are located
inside the control compartment (see Figure 41).
1 AMC and main INTerface circuit board of the INU
2 AMC and main INTerface circuit board of the AFE
Each circuit board is fitted with a 250 MHz
Motorola DSP processor and features two PPCS
and eight DDCS communication channels. These
communication channels are used for high speed
data transfer via the INT circuit boards to the
Phase INT circuit boards inside the phase
modules (see Figure 42).
The main internal control devices and the
peripheral input and output interfaces to the
customer communicate with the AMC circuit
board via fiber-optic cables.
Control compartment interior
Communication with IOEC I/O system
The AMC circuit board of the INU and the IOEC I/O
system communicate via two DDCS fiber-optic
communication links, DDCS TX (for sending data),
DDCS RX (for reading data), and an optional MCB-
OFF optical input. The fiber-optic cables are
connected to channel 7 of the AMC circuit boards.
Control tasks
Each AMC circuit board has specific control and
closed-loop tasks assigned to it.
• The AMC circuit board of the AFE handles all
rectifier and line-related functions of the drive
• The AMC circuit board of the INU handles all
other control tasks. It processes drive and
status information, performs the speed and
torque control tasks, and monitors the
operation of the drive
1
It continuously monitors all relevant drive variables
(e.g. speed, current, voltage). Pre-programmed
internal protection functions ensure that these
variables remain within safe operating limits.
Optionally, the drive offers monitoring of signals
from external equipment. These can be activated
and adjusted by parameter settings.
2
Other general control, protection and monitoring
tasks are implemented within the drive, including
control and monitoring of the:
• MV switchgear
• Grounding switch
• Cooling system
See Appendix M - Signal and parameter
table, located on the CD, for further
information on control, protection and
monitoring functions.
MV (Medium Voltage) switchgear
The MV switchgear is a major switching and
protection device for the drive system.
This switchgear connects/disconnects the main
power supply to the drive and is required to
operate upon the drive's commands. The drive
must have exclusive control over the switchgear
as part of the pre-charge sequence of
operation and discharging of the DC link.
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