Internal Current Control In Vvc Plus Mode; Local (Hand On) And Remote (Auto On) Control - Danfoss VLT AutomationDrive FC 300 Design Manual

FC 300 Design Guide
In the shown configuration, par. 1-01 Motor Control Principle is set to "Flux w motor feedb [3]" and par.
1-00 is set to "Speed closed loop [1]".
The motor control in this configuration relies on a feedback signal from an encoder mounted directly on
the motor (set in par. 1-02 Motor Shaft Encoder Source).
Select "Speed closed loop [1]" in par. 1-00 to use the resulting reference as an input for the Speed PID
control. The Speed PID control parameters are located in par. group 7-0*.
Select "Torque [2]" in par. 1-00 to use the resulting reference directly as a torque reference. Torque
control can only be selected in the Flux with motor feedback (par. 1-01 Motor Control Principle) config-
uration. When this mode has been selected, the reference will use the Nm unit. It requires no torque
feedback, since the actual torque is calculated on the basis of the current measurement of the frequency
converter.
Select "Process [3]" in par. 1-00 to use the process PID control for closed loop control of e.g. speed or a
process variable in the controlled application.
Internal Current Control in VVC
The frequency converter features an integral current limit control which is activated when the motor
current, and thus the torque, is higher than the torque limits set in par. 4-16, 4-17 and 4-18.
When the frequency converter is at the current limit during motor operation or regenerative operation,
the frequency converter will try to get below the preset torque limits as quickly as possible without losing
control of the motor.
Local (Hand On) and Remote (Auto On) Con-
trol
The frequency converter can be operated manually via the local control panel (LCP) or remotely via analog
and digital inputs and serial bus.
If allowed in par. 0-40, 0-41, 0-42, and 0-43, it is possible to start and stop the frequency converter via
the LCP using the [Hand ON] and [Off] keys. Alarms can be reset via the [RESET] key. After pressing the
[Hand On] key, the frequency converter goes into Hand mode and follows (as default) the Local reference
that can be set using arrow key on the LCP.
After pressing the [Auto On] key, the frequency
converter goes into Auto mode and follows (as
default) the Remote reference. In this mode, it is
possible to control the frequency converter via the
digital inputs and
(RS-485, USB, or an optional fieldbus). See more
about starting, stopping, changing ramps and pa-
rameter set-ups etc. in par. group 5-1* (digital
inputs) or par. group 8-5* (serial communica-
tion).
Active Reference and Configuration Mode
The active reference can be either the local reference or the remote reference.
In par. 3-13 Reference Site the local reference can be permanently selected by selecting Local [2].
To permanently select the remote reference select Remote [1]. By selecting Linked to Hand/Auto [0]
(default) the reference site will depend on which mode is active. (Hand Mode or Auto Mode).
22
Introduction to FC 300
plus
Mode
various serial interfaces
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