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External control
When the drive is in external control, control commands are given through
•
the I/O terminals (digital and analog inputs), or optional I/O extension modules
•
the embedded fieldbus interface or an optional fieldbus adapter module
•
the external (DDCS) controller interface
•
the master/follower link, and/or
•
the control panel.
Two external control locations, EXT1 and EXT2, are available. The user can select
the sources of the start and stop commands separately for each location by
parameters
. The operating mode can be selected separately for each
location (in parameter group
) which enables quick switching between different
operating modes, for example speed and torque control. Selection between EXT1
and EXT2 is done via any binary source such as a digital input or fieldbus control
word (see parameter
). The source of reference is selectable for each operating
mode separately.
The control location selection is checked on a 2 ms time level.
Using the control panel as an external control source
The control panel can also be used as a source of start/stop commands and/or
reference in external control. Selections for the control panel are available in the
start/stop command source and reference source selection parameters.
Reference source selection parameters (except PID setpoint selectors) have two
selections for the control panel. The difference between the two selections is in
the initial reference value after the reference source switches to the control panel.
The panel reference is saved whenever another reference source is selected. If the
reference source selection parameter is set to Control panel (ref saved), the saved
value is used as the initial reference when control switches back to the panel. Note
that only one type of reference can be saved at a time: for example, attempting
to use the same saved reference with different operating modes (speed, torque,
etc.) causes the drive to trip on
. The panel reference can be separately limited
by parameters in group
.
With the reference source selection parameter set to Control panel (ref copied),
the initial panel reference value depends on whether the operating mode changes
with the reference source. If the source switches to the panel and the operating
mode does not change, the last reference from the previous source is adopted. If
the operating mode changes, the drive actual value corresponding to the new
mode is adopted as the initial value.
Control locations and operating modes 25
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