Shortened Rotating Measurement - Siemens SINAMICS S120 Function Manual

4.14.4

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. There are two variants for this shortened
rotating measurement:
● 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 p1961 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 still 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automatic parameter adjustments made for the measurement are withdrawn again after the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 carried out.
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.
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 optimization) 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.
Drive functions
Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
4.14 Motor data identification and rotating measurement
Vector control
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