Internal Current Control In Vvc + Mode; Local (Hand On) And Remote (Auto On) Control - Danfoss VLT Midi Drive FC 280 Design Manual

Product Overview
is received and fed through the ramp limitation and speed limitation before being sent to the motor control. The output of
the motor control is then limited by the maximum frequency limit.
2 2
If parameter 1-00 Configuration Mode is set to [1] Speed closed loop, the resulting reference is passed from the ramp
limitation and speed limitation into a speed PID control. The speed PID control parameters are in parameter group 7-0*
Speed PID Ctrl. The resulting reference from the speed PID control is sent to the motor control limited by the frequency limit.
Select [3] Process in parameter 1-00 Configuration Mode to use the process PID control for closed-loop control of speed or
pressure in the controlled application. The process PID parameters are in parameter groups 7-2* Process Ctrl. Feedb and 7-3*
Process PID Ctrl.
2.3.4 Internal Current Control in VVC
Mode
The frequency converter features an integral current limit
control. This feature 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, the frequency
converter tries to get below the preset torque limits as
quickly as possible without losing control of the motor.
20
®
VLT Midi Drive FC 280
2.3.5 Local (Hand On) and Remote (Auto
+
Operate the frequency converter manually via the local
control panel (graphic LCP or numerical LCP) or remotely
via analog/digital inputs or fieldbus.
Start and stop the frequency converter by pressing the
[Hand On] and [Reset] keys on the LCP. Set-up is required
via the following parameters:
•
•
•
Reset alarms via the [Reset] key or via a digital input, when
the terminal is programmed to Reset.
Hand
Illustration 2.11 GLCP Control Keys
Illustration 2.12 NLCP Control Keys
Local reference forces the configuration mode to open
loop, independent of the setting in parameter 1-00 Configu-
ration Mode.
Local reference is restored when the frequency converter
powers down.
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On) Control
Parameter 0-40 [Hand on] Key on LCP.
Parameter 0-44 [Off/Reset] Key on LCP.
Parameter 0-42 [Auto on] Key on LCP.
Auto
O
on on
Hand Off
On Reset
Reset
Auto
On
MG07B102