ABB ACS1000i air-cooled, User Manual

Page: 65 / 174

04 CONTROL SYSTEM
3BHS206977 E01 REV H ACS1000I AIR-COOLED USER MANUAL 65/174
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Sequential control mode
: used in processes that require different constant speed settings
and/or different acceleration and/or deceleration settings in addition to an adjustable
speed reference value.
Up to seven constant speed settings and two acceleration and/or deceleration settings are
possible. The selection of the different settings can be automated by a process control
system or can be made manually by selector switches that are connected to the
corresponding digital inputs of the drive.
The preset values of a control mode can be left unchanged or they can be set individually by the
commissioning engineer as required for the application.
4.2.2.7 Operating modes
The drive provides the following operating modes:
- Master-follower operating mode : used for applications with several drives where the
motor shafts are coupled to each other (eg, gearing, chain, belt). Owing to the master-
follower operating mode the load can be evenly distributed between the drives or at some
adjustable other ratio which depends on the process.
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Hand-auto operating mode
: suitable for applications where the speed has to be controlled
automatically by a process automation system and manually by an external control panel.
The active control station is selected via a digital input.
The operating mode is also recommended when two external control stations exist from
where the reference value can be set and the drive can be started and stopped. The external
control station is selected via a digital input.
For more information on control mode settings, see “Appendix G – Signal and
parameter table”.