Lenze 8400 motec - Manual (Page 94)

5 Motor control (MCTRL)
5.4 Defining current and speed limits
94 Lenze · 8400 motec · Reference manual · DMS 4.1 EN · 08/2013 · TD05
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5.4 Defining current and speed limits
Limitation of the speed setpoint
Parameterising the reference speed in
C00011 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
C00011 .

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 (
C00011 ) = 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
generator 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
C00909/1 Max. positive speed 120 %
C00909/2 Max. negative speed 120 %
C00910/1 Max. positive output frequency 300 Hz
C00910/2 Max. negative output frequency 300 Hz
Parameter Info Lenze setting
Value Unit
C00022 Imax in motor mode 47.00 A
C00023 Imax in generator mode
• 100 % ≡ Imax in motor mode ( C00022 )
100 %