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5
Motor control (MCTRL)
5.9
Servo control (SC)
236
Lenze · 8400 HighLine · Reference manual · DMS 12.0 EN · 06/2017 · TD23
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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 (
) and the max. current in generator
mode (
). 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
(
) 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.