Lenze 8400 TopLine - Manual (Page 233)

Lenze · 8400 TopLine · Reference manual · DMS 6.0 EN · 06/2014 · TD05/TD14
233
5 Motor control (MCTRL)
5.9 Servo control (SC)
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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.

Note!
To avoid instabilities during operation, the torque limit values are internally processed
as absolute values.

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. Alternatively, the motor temperature
compensation can be switched off via C02878 . In this case, however, the torque
accuracy decreases.