Shortened Rotating Measurement - Siemens SINAMICS S120 Function Manual

Vector control
5.13 Motor data identification and rotating measurement
5.13.4

Shortened rotating measurement

A normal rotating measurement cannot always be performed when a load is connected.
When switching the motor on for the first time, a short measurement of the moment of inertia
and the measurement of the magnetizing current and the saturation characteristic can be
performed with a simplified measuring procedure. The following settings are possible:
● Measurement shortened (p1959.12 = 1)
● After measurement: Direct transition to operation (p1959.13 = 1)
During the rotating measurement, the drive is not run up to the rated speed, but up to the
value in p1965 related to the rated speed (p0310). In the factory setting, this is 40 %.
Parameter p1965 can be adapted to the operational requirements, but must be large enough
so that the machine can safely leave the open-loop controlled mode. The machine should
still be operated as far as possible in no-load operation (torque < 30 % M
During the rotating measurement, the saving of parameters is blocked because automatic
parameter adjustments made for the measurement are withdrawn again after the
measurement.
Measurement shortened (p1959.12 = 1)
If you have set bit 12 in parameter p1959, a shortened rotating measurement is performed
with reduced accuracy for the measurement of the moment of inertia. In this case, the
magnetizing current is measured only once instead of twice. The measurement of the
acceleration processes and the vibration test are not used at all.
After the end of the measurement, the drive is shut down and all the parameters modified for
performing the measurement are reset to their original values.
p1959.12 does not have any effect on p1960 = 3, 4.
After measurement: Direct transition to operation (p1959.13 = 1)
In this case, the drive is not stopped at the end, but run up directly with the acceleration
ramp up to the desired speed setpoint.
Do not change controller parameters during the measurement (p1959.11 = 1)
During rotating measurement, the drive automatically changes its speed controller
parameters during ramp-up. This is also performed when bits 3 (recalculate speed controller
parameters) and 4 (speed controller tuning) are not set. On many plants, the decoupling of
the drives requires a lot of work. The loads have high moments of inertia. The controller
parameters set by the drive do not always correspond to the drive application and may
therefore potentially cause damage to the mechanical system.
If you have set bit 11 in parameter p1959, the recalculation of the speed controller
parameters is prevented.
256
rated
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
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Drive functions