Danfoss VLT AutomationDrive FC 300 Series - Internal Current Control in VVC Plus Mode; Local (Hand On) and Remote (Auto On) Control

3.2.7
Internal Current Control in VVC
plus
Mode
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
4-16 Torque Limit Motor Mode, 4-17 Torque Limit Generator
Mode and 4-18 Current Limit.
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.
3.2.8
Local (Hand On) and Remote (Auto
On) Control
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 0-40 [Hand on] Key on
LCP, 0-41 [Off] Key on LCP, 0-42 [Auto on] Key on LCP, and
0-43 [Reset] Key on LCP, it is possible to start and stop the
frequency converter via the LCP pressing [Hand On] and
[Off]. Alarms can be reset via [Reset]. After pressing [Hand
On], 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 [Auto On], 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 various serial
interfaces (RS-485, USB, or an optional fieldbus). See more
about starting, stopping, changing ramps and parameter
set-ups etc. in parameter group 5-1* Digital Inputs or
parameter group 8-5* Serial communication.
130BP046.10
Hand
on
O
Auto
on
Reset
Illustration 3.6 Operation Keys
Active Reference and Configuration Mode
The active reference can be either the local reference or
the remote reference.
In 3-13 Reference Site the local reference can be
permanently selected by selecting [2] Local.
To permanently select the remote reference select [1]
Remote. By selecting [0] Linked to Hand/Auto (default) the
reference site will depend on which mode is active. (Hand
Mode or Auto Mode).
Remote
reference
Local
reference
Auto mode
Hand mode
Linked to hand/auto
Local
Remote
Reference
130BA245.11
LCP Hand on,
o and auto
on keys
P 3-13
Reference site
Illustration 3.7 Active Reference
Torque
Speed open/
closed loop
Scale to
RPM or
Hz
Scale to
Nm
Scale to
process
unit
Process
closed loop
Local
ref.
Local
reference
Conguration
mode
Local
conguration
mode
130BA246.10
P 1-00
P 1-05
Illustration 3.8 Configuration Mode
Hand On AutoLCP Keys
3-13 Reference
Site
Active Reference
Hand Linked to Hand/
Auto
Local
Hand → Off
Linked to Hand/
Auto
Local
Auto Linked to Hand/
Auto
Remote
Auto → Off
Linked to Hand/
Auto
Remote
All keys Local Local
All keys Remote Remote
Table 3.2 Conditions for Local/Remote Reference Activation
Introduction
VLT
®
AutomationDrive FC 300 Design Guide, 0.25-75 kW
MG33BE02 - VLT
®
is a registered Danfoss trademark 21
3
3
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