Siemens SINAMICS S120 Function Manual page 201

4. The result can be improved by compensating the voltage emulation error (only for
synchronous motors).
– To do this, activate function module "Extended torque control (Page 442)" (r0108.1).
– Determine the voltage emulation error with the stationary motor data identification
– Activate the compensation of the voltage emulation error (p1780.8 = 1).
5. If, after reaching the current setpoint, the current actual value dips, correct the current actual
value via p1734 or p1735 (see the subsequent diagram).
Figure 5-39
Optimizing parameters p1734 and p1735
Proceed as follows to optimize parameters p1734 and p1735:
1. Set the current controller P gain (p1715) lower by a factor of 10.
2. Set the current controller integral time (p1717) higher by a factor of 10.
3. Set the decrease of the eddy current compensation p1734 = 0.
Drive functions
Function Manual, 06/2019, 6SL3097-5AB00-0BP2
(p1909.14 = 1 and p1910).
Example: Voltage precontrol before optimization (with dip)
Servo control
5.23 Voltage precontrol
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