ACS2000 User manual 2UEA001270 Rev. F 3-5 (26)
Chapter 3 - Control system
3.2.1.1 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.
3.2.1.2 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
t
orque 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 functi
ons
ens
ure that these variables remain within safe operating limits.
Optionally, the drive offers monitoring of signals from exter
nal
equi
pment. These can be activated and adjusted by parameter
settings.
Other general control, protection and monitoring tasks ar
e
i
mplemented within the drive, including control and monitoring of the:
• MV switchgear
• grounding swit
ch
•
cooling system
See Appendix M - Signal and parameter table, located on the CD, for
further information on control, protection and monitoring functions.
3.2.1.3 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.
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.
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