July 2013 6.8 The control loop 887
Feed axis in EcoDyn mode—medium load (MP2160 = 2) ((8) in the
commissioning flow chart)
After you have found the desired acceleration and jerk for the axis concerned,
check the axis load during motion. To do so, reverse the axis up to maximum
feed rate and record the torque current Inoml on the internal oscilloscope. If
the amount of torque current never exceeds approx. 70 % of the maximum
current, there are enough reserves for the magnetizing components—the
setting of MP2160 (=2) is completed. Please note: The maximum current is
the lesser of maximum motor current and maximum power stage current.
Feed axis in EcoDyn mode—high load (MP2160 = 2) ((9) in the
commissioning flow chart)
However, if the torque current is greater than 70 % of the maximum current,
record the actual current Iactl on the internal oscilloscope to check whether it
approaches the maximum current. The actual current contains both the torque
current component as well as the magnetizing current component. If the
amount of actual current never exceeds approx. 90 % of the maximum
current, there are still enough reserves for the magnetizing components—the
setting of MP2160 (=2) is completed here, too.
Feed axis in EcoDyn mode—high load (MP2160 = 10) ((10) in the
commissioning flow chart)
With the entry MP2160 = 10 you can activate an alternative algorithm for
determining magnetizing current. This can lower the magnetizing current. The
total actual current in the field weakening range falls with it.
Feed axis in EcoDyn mode—high load (MP2160 = 10) ((11) in the
commissioning flow chart)
If you succeed with MP2160 = 10 in limiting the actual current to less than 90
% of the maximum current, there are enough reserves again for the
magnetizing component—the setting of MP2160 (=10) is completed here.
Feed axis in EcoDyn mode—high load (MP2160 = 10) ((12) in the
commissioning flow chart)
If the actual current stays over 90 % of the maximum current, the load on the
drive can be reduced through a reduction of the acceleration and/or jerk.
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