Lenze LDEC Series - Frequency Limitation Function (Speed Limit)

Function library
Motor control
"Frequency limitation" function (speed limit)
8
l
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LDEDS−CCU210B EN 4.0
8.5.3 "Frequency limitation" function (speed limit)
In order to interrupt the main functions "Motor V1−V8", the "Frequency limitation"
function can be used. If the function is active, it limits the drive frequency to the maximum
value that is respectively set (C0441/1 ... C0441/4). For this purpose, four independent
functions are provided (C0410/20 ... C0410/23):
ƒ The functions are activated via digital signal sources (e. g. digital inputs).
ƒ For the deceleration of Vx to the limited speed VLx there are separate deceleration
ramps (C0444/1 ... C0444/4).
ƒ For each function you can set deceleration times for the acceleration ramps
(C0442/1 ... C0442/4) and deceleration ramps (C0443/1 ... C0443/4).
ƒ You can set each function so that the frequency limitation only is activated in the
case of one direction of rotation of the drive.
Codes for parameter setting
Code Possible settings Description
No. ñò < Byte Lenze Selection
C0440 Configuration of function ...
^ 55
1
RW EXT 4
3 ... Frequency limitation 1
2 3 ... Frequency limitation 2
3 3 ... Frequency limitation 3
4 3 ... Frequency limitation 4
Possible values
1 Frequency limitation only active in
the case of CW rotation
2 Frequency limitation only active in
the case of CCW rotation
3 Frequency limitation active in the
case of CW and CCW rotation
C0441 Drive frequency for ...
^ 55
1
RW EXT 4
0
0 {Hz} 120.0
... Frequency limitation 1 (VL1)
2 0 ... Frequency limitation 2 (VL2)
3 0 ... Frequency limitation 3 (VL3)
4 0 ... Frequency limitation 4 (VL4)
C0442 delay time:
acceleration VLx ðVx after
deactivation of ...
^ 55
1
RW EXT 4
0
0 {ms} 20000
... Frequency limitation 1
2 0 ... Frequency limitation 2
3 0 ... Frequency limitation 3
4 0 ... Frequency limitation 4
C0443 delay time:
start of deceleration ramp Vx ð VLx
after command ...
^ 55
1
RW EXT 4
0
0 {ms} 20000
... Frequency limitation 1
2 0 ... Frequency limitation 2
3 0 ... Frequency limitation 3
4 0 ... Frequency limitation 4