ABB ACSM1 Series, Руководство по прошивке

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Drive control and features
34
Local control is mainly used during commissioning and maintenance. The control
panel always overrides the external control signal sources when used in local
control. Changing the control location to local can be disabled by parameter
16.01
LOCAL LOCK .
The user can select by a parameter ( 46.03 LOCAL CTRL LOSS ) how the drive
reacts to a control panel or PC tool communication break.
External control
When the drive is in external control, control commands (start/stop and reference)
are given through the fieldbus interface (via an optional fieldbus adapter module),
the I/O terminals (digital and analogue inputs), optional I/O extension modules or the
drive-to-drive link. External references are given through the fieldbus interface,
analogue inputs, drive to drive link and encoder inputs.
Two external control locations, EXT1 and EXT2, are available. The user can select
control signals (e.g. start/stop and reference) and control modes for both external
control locations. Depending on the user selection, either EXT1 or EXT2 is active at
a time. Selection between EXT1/EXT2 is done via digital inputs or fieldbus control
word.
Operating modes of the drive
The drive can operate in speed and torque control modes. A block diagram of the
drive control chain for these modes is presented on page
35 ; more detailed
diagrams are presented in chapter Control chain block diagrams (page 307 ).
Speed control mode
Motor rotates at a speed proportional to the speed reference given to the drive. This
mode can be used either with estimated speed used as feedback, or with an
encoder or resolver for better speed accuracy.
Speed control mode is available in both local and external control.
Torque control mode
Motor torque is proportional to the torque reference given to the drive. This mode
can be used either with estimated speed used as feedback, or with an encoder or
resolver for more accurate and dynamic motor control.
Torque control mode is available in both local and external control.