Siemens Sinamics G120 Series Parameter Manual page 195

p1960 Speed control optimisation / Speed control opt.
CU240E Access level: 3
CU240S
Quick comm. YES
CU240S DP
Can be changed: C, T
CU240S DP-F
CU240S PN
PM240
Min
0
Description: The drive should be set into a vector mode (P1300 = 20) to carry out speed controller optimisation.
When speed controller optimisation is enabled (P1960 = 1) the warning A0542 will become active.
When the drive is next started it will do the optimisation tests.
The drive will accelerate the motor to 20 % of P0310 (rated motor frequency) using the ramp up time P1120 and
then under torque control go to 50 % of P0310 (rated motor frequency).
The drive will then ramp back down to 20 % using the ramp down time P1121.
This procedure is repeated several times and then average time taken.
From this an estimation of the inertia of the load on the motor can be derived.
From this the inertia ratio parameter (P0342) and the Kp gains for SLVC (P1470) are modified to give a response
suitable for the measured inertia.
Values: 0:
1:
Notice: If there is a problem due to instability the drive may trip with an F0042 fault if a stable value has not been obtained
on the ramp up within a reasonable time.
It should be noted that the Dc link controller should be enabled whilst doing the test as otherwise overvoltage trips
maybe experienced.
This will however depend on the ramp down time and the system inertia.
The speed loop optimisation may not be suitable for some applications due to the nature of the test i.e. accelerating
under torque control from 20 % to 50 %.
Note: When the test is complete P1960 will be cleared to zero.
In SLVC (P1300 = 20) the drive will set the motor model to start in open loop (P1750.0 = 1) when the speed control
optimisation is selected (P1960 = 1) and will be set to its old state
after the end of the optimisation (P1960 = 0).
© Siemens AG 2007 All Rights Reserved
SINAMICS G120 Control Units CU240S, Edition 05/2007
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Enable
P-Group: Motor
Active: NO
Max
1
Parameters
List of Parameters
Data type: Unsigned16
Data set: -
Factory setting
0
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