In
,
parameter 1-01 Motor Control Principle
is
set to
[3] Flux w motor feedb
and
parameter 1-00 Configu-
ration Mode
is set to
[1] Speed closed loop
.
The motor control in this configuration relies on a
feedback signal from an encoder mounted directly on the
motor (set in
parameter 1-02 Flux Motor Feedback Source
).
To use the resulting reference as an input for the speed
PID control, select
[1] Speed closed loop
in
parameter 1-00 Configuration Mode
. The speed PID control
parameters are located in
parameter group 7-0* Speed PID
Ctr.
Select
[2] Torque
in
parameter 1-00 Configuration Mode
to
use the resulting reference directly as a torque reference.
Torque control can only be selected in the
Flux with motor
feedback
(
parameter 1-01 Motor Control Principle
) configu-
ration. When this mode has been selected, the reference
uses the N·m unit. It requires no torque feedback, since the
actual torque is calculated from the current measurement
of the frequency converter.
To use the process PID control for closed-loop control of
speed or a process variable in the controlled application,
for example, select
[3] Process
in
parameter 1-00 Configu-
ration Mode
.
14.6 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
parameter 4-16 Torque Limit Motor Mode
,
parameter 4-17 Torque Limit Generator Mode
, and
parameter 4-18 Current Limit
.
When the frequency converter is at the current limit during
motor operation or regenerative operation, it tries to get
below the preset torque limits as quickly as possible
without losing control of the motor.
14.7 Local and Remote Control
The frequency converter can be operated manually via the
LCP or remotely via analog and digital inputs and fieldbus.
If allowed in
parameter 0-40 [Hand on] Key on LCP
,
parameter 0-41 [Off] Key on LCP
,
parameter 0-42 [Auto on]
Key on LCP
, and
parameter 0-43 [Reset] Key on LCP
, it is
possible to start and stop the frequency converter via the
LCP [Hand On] and [Off]. Press [Reset] to reset the alarms.
After pressing [Hand On], the frequency converter goes
into hand-on mode and follows (as default) the local
reference that can be set using the arrow keys on the LCP.
After pressing [Auto On], the frequency converter goes into
auto-on mode and follows (as default) the remote
reference. In this mode, it is possible to control the
frequency converter via the digital inputs and various serial
interfaces (RS485, USB, or an optional fieldbus). For
information about starting, stopping, changing ramps and
parameter set-ups, see
parameter group 5-1* Digital Inputs
or
parameter group 8-5* Serial Communication
.
130BP046.10
Hand
on
Off
Auto
on
Reset
Illustration 14.5 LCP Control Keys
Active reference and configuration mode
The active reference can be either the local reference or
the remote reference.
The local reference can be permanently selected by
selecting
[2] Local
in
parameter 3-13 Reference Site
.
To permanently select the remote reference, select
[1]
Remote
. By selecting
[0] Linked to Hand/Auto
(default), the
reference site depends on whether hand-on mode or auto-
on mode is active.
Remote
reference
Local
reference
Auto mode
Hand mode
Linked to hand/auto
Local
Remote
Reference
130BA245.11
LCP Hand on,
off and auto
on keys
P 3-13
Reference site
Illustration 14.6 Active Reference
Controls
Design Guide
MG37N102
Danfoss A/S © 6/2016 All rights reserved.
133
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Summary of Contents for VLT 380-500 V
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