User guide

5 Motor control (MCTRL)
5.3 Defining current and speed limits
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Lenze · 8400 BaseLine C · Reference manual · DMS 1.6 EN · 01/2014 · TD05
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5.3 Defining current and speed limits
Limitation of the speed setpoint
Parameterising the reference speed in C011
means that the drive must rotate at the set speed if a
speed setpoint of 100% is specified
All speed setpoint selections are provided in % and always refer to the reference speed set in C011
.
 Tip!
For reasons of achievable resolution and the accuracy involved, the reference speed should
be geared to the speed range required for the respective application.
Lenze recommendation: Reference speed (C011
) = 1500 ... 3000 rpm
Irrespective of the selected motor control, there are more limitation options:
Current limitation in motor and generator mode
In the various motor control modes, the controller is provided with functions which determine the
dynamic behaviour under load and counteract exceedance of the maximum current in motor or ge-
nerator mode.
The current limits must be selected depending on
• the permissible maximum current of the motor  recommendation: I(Mot)
N
< 1.5 ... 2.0
• the permissible maximum current of the inverter
• the torque in motor/generator mode required for the application
Parameter Info Lenze setting
Value Unit
C909/1 Max. positive speed 120 %
C909/2
Max. negative speed 120 %
C910/1
Max. positive output frequency 1000 Hz
C910/2
Max. negative output frequency 1000 Hz
Parameter Info Lenze setting
Value Unit
C022 Imax in motor mode 47.00 A
C023
Imax in generator mode
• 100 % ≡ Imax in motor mode (C022
)
100 %