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

FC 300 Design Guide
In the configuration shown, par. 1-01
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
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
Principle
It requires no torque feedback, since the actual torque is calculated on the basis of the current
measurement of the adjustable frequency drive.
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.

3.2.7. Internal Current Control in VVCplus Mode

The adjustable frequency drive 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 adjustable frequency drive is at the current limit during motor operation or regenerative
operation, the adjustable frequency drive will try to get below the preset torque limits as quickly
as possible without losing control of the motor.

3.2.8. Local (Hand On) and Remote (Auto On) Control

The adjustable frequency drive 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 adjustable fre-
quency drive 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 adjustable frequency drive goes into hand mode and
follows (as default) the local reference that can be set using the arrow key on the LCP.
After pressing the [Auto On] key, the adjust-
able frequency drive goes into auto mode and
follows (as default) the remote reference. In
this mode, it is possible to control the adjust-
able frequency drive via the digital inputs and
various serial interfaces (RS-485, USB, or an
optional serial communication bus). See more
about starting, stopping, changing ramps and
parameter set-ups, etc. in par. group 5-1*
(digital inputs) or par. group 8-5* (serial com-
munication).
) configuration. When this mode has been selected, the reference will use the Nm unit.
MG.33.B9.22 - VLT ® is a registered Danfoss trademark.
Motor Control Principle is set to "Flux w motor feedb [3]"
Motor Shaft Encoder Source ).
Flux with motor feedback
3. Introduction to FC 300
Motor Control
(par. 1-01
130BP046.10
3
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