Lenze 8400 - Manual (Page 186)

5 Motor control (MCTRL)
5.7 Sensorless vector control (SLVC)
186
Lenze · 8400 protec HighLine · Reference manual · DMS 3.0 EN · 03/2013 · TD05
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Motor current limitation
A cross current setpoint is calculated from the torque setpoint which is limited depending on the
magnetising current, the max. current in motor mode ( C00022 ) and the max. current in generator
mode ( C00023 ). The total current injected into the motor does not exceed the max. currents in
motor mode and in generator mode.
Slip compensation
The slip of the machine is reconstructed using the slip model. An influencing parameter is the slip
constant ( C00021 ).  Slip compensation ( 252)

Note!
For synchronous motors, the Lenze setting of the torque limits nTorqueMotLimit_a and
nTorqueGenLimit_a to 100 % can result in the activation of the torque limitation for
motor temperature < max. motor temperature before the set current limit values
( C00022 , C00023 ) are reached.
• With a motor temperature of approx. 20°C and maximum load, the maximum current
will then be set to approx. 15 % below the set current limit values.
• Remedy: If the torque limits nTorqueMotLimit_a and nTorqueGenLimit_a are
increased to 115 %, the set current limit values can also be reached for a motor
temperature of 20°C and maximum load.