Siemens SIMATIC ET 200pro Series Operating Instructions Manual page 148

Advanced commissioning
7.11 Motor control
If the motor exhibits the following response, the speed control is well set and you do not
have to adapt the speed controller manually:
Control optimization required
In some cases, the self optimization result is not satisfactory, or self optimization is not
possible as the motor cannot freely rotate.
In the two cases describe above, we recommend that you manually optimize the speed
control.
The most important parameters
Table 7- 30
Parameter
p0342
p1496
p1452
p1470
p1472
Optimizing the speed controller
Requirements
● Torque precontrol is active: p1496 = 100 %.
● The load moment of inertia is constant and independent of the speed.
148
The speed setpoint (broken line) increases with the set ramp-
up time and rounding.
The speed actual value follows the setpoint without any over-
shoot.
Initially, the speed actual value follows the speed setpoint
with some delay, and then overshoots the speed setpoint.
First, the actual speed value increases faster than the speed
setpoint. Before the setpoint reaches its final value, it passes
the actual value. Finally, the actual value approaches the
setpoint without any significant overshoot.
Encoderless speed control
Description
Moment of inertia ratio, total to motor (factory setting: 1.0)
Acceleration precontrol scaling (factory setting: 0 %)
For the rotating measurement of the motor data identification the inverter sets the
parameters to 100 %.
Speed controller speed actual value smoothing time (without encoder) (factory setting:
10 ms)
Speed controller operation without encoder P gain (factory setting: 0.3)
Speed controller operation without encoder integral action time (factory setting: 20 ms)
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34257324B AE
SIMATIC ET 200pro FC-2 converter