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Unexpected motor movement when identifying the motor
When motor identification is selected, movements of the motor can be initiated after the
drive is commissioned.
• Observe the general safety instructions.
• Ensure that the EMERGENCY OFF functions are functional during commissioning.
9.3.1.2
Rotating measurement and speed controller optimization
Description
"Rotating measurement" can be activated using p1960 or using p1900 = 1.
The main difference between rotating measurement and standstill measurement is speed
control optimization, with which the drive's moment of inertia is ascertained and the speed
controller is set. In addition, the saturation characteristic and rated magnetization current of
induction motors are measured.
If the rotating measurement is not to be carried out using the speed set in p1965, this
parameter can be changed before the measurement is started. Higher speeds are
recommended.
The same applies to the speed in p1961, at which the saturation characteristic is determined
and the encoder test is carried out.
The speed controller is set to the symmetrical optimum in accordance with dynamic factor
p1967. p1967 must be set before the optimization run and only affects the calculation of the
controller parameters.
If, during the measurement, it becomes clear that the drive cannot operate in a stable
manner with the specified dynamic factor or that the torque ripples are too great, the
dynamic response is reduced automatically and the result displayed in r1968. The drive must
also be checked to ensure that it is stable across the entire range. The dynamic response
might need to be reduced or Kp/Tn adaptation for the speed controller configured
accordingly.
When commissioning induction machines, you are advised to proceed as follows:
● Before connecting the load, a complete "rotating measurement" (without encoder:
p1960 = 1; with encoder: p1960 = 2) should be carried out. Since the induction machine
is idling, you can expect highly accurate results for the saturation characteristic and the
rated magnetization current.
● When the load is connected, speed controller optimization should be repeated because
the total moment of inertia has changed. This is done by selecting parameter p1960
(without encoder: p1960 = 3; with encoder: p1960 = 4).
The saturation characteristic recording is automatically deactivated in parameter p1959
during the speed tuning run.
When permanent-magnet synchronous motors are commissioned, the speed controller
should be tuned (p1900 = 3 or p1960 > 0) when the load is connected.
Converter cabinet units
Operating Instructions, 11/2017, A5E36652151A
WARNING
Functions, monitoring and protective functions
9.3 Drive functions
495
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