ABB ACS2000 User Manual page 73

3.2.1.1 Communication with IOEC I/O system
3.2.1.2 Control tasks
3.2.1.3 MV (Medium Voltage) switchgear
ACS2000 User manual
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.
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.
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.
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.
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.
NOTICE
The ACS2000 must have exclusive control of closing the MV switchgear.
Uncontrolled closing of the switchgear may cause damage to the drive.
See Appendix G - MV switchgear guide for control details. ACS2000
supplied with the optional integral input contactor disconnect has this
switching integral to the drive. See Appendix P for details.
2UEA001270 Rev. F
Chapter 3 - Control system
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