Firmware ≤ 11.00 - DMS 8.0 EN - 10/2011 L 123
8400 StateLine C | Reference manual
Motor control (MCTRL)
Defining current and speed limits
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
C00022 Imax in motor mode 47.00 A
C00023
Imax in generator mode
• 100 % ≡ Imax in motor mode (C00022
)
100 %
Note!
Highly dynamic applications
(that have e.g. too short acceleration/deceleration times or excessively changing
loads)
The overcurrent disconnection may respond (fault message OC1 or OC11) if the
setting of the maximum current in motor mode in C00022
approximately
corresponds to the maximum permissible value of the respective inverter.
Remedies:
• Increase of the acceleration and deceleration ramp times
• Reduction of the maximum current in motor mode (C00022
)
• Reduction of the maximum current in generator mode (C00023
)
• Adaptation of the indirect peak current limitation (procedure depends on the
selected motor control mode, see below)
• Reduction of the reset time of the current limiting controller (C00074/1
)
Influencing the torque in motor/generator mode
The torque in motor and generator mode can be limited via the nTorqueMotLim
and nTorqueGenLim process signal inputs.
• If V/f characteristic control (VFCplus) is selected, limitation is indirectly
performed via a so-called I
max
controller.
• If sensorless vector control (SLVC) and sensorless control for synchronous
motors (SLPSM) have been selected, limitation has a direct
effect on the
torque-producing current component.
If keypad control is selected, the nTorqueMotLim and nTorqueGenLim process
signals can be parameterised via C00728/1...2
.
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