Checking The Encoder Signal; Select Motor Control - Siemens SINAMICS G120D Original Instructions Manual

8.5.2.1

Checking the encoder signal

If you use an encoder to measure the speed, you should check the encoder signal before the
encoder feedback is active.
Procedure
Proceed as follows to check the encoder signal using STARTER:
1. Set the control mode "encoderess vector control": p1300 = 20.
2. Switch-on the motor with an average speed.
3. Compare parameters r0061 (speed encoder signal in rpm) and r0021 (calculated speed
4. If the signs do not match, invert the speed encoder signal: Set p0410 = 1.
5. If the absolute values of the two values do not match, check the setting of p0408 and the
You have ensured that the scaling and polarity of the encoder signal are correct.
8.5.2.2

Select motor control

Vector control is already preset
To achieve a good controller response, you must adapt the elements marked in gray in the
figure in the overview diagram above. If you selected vector control as control mode in the
basic commissioning, you will have already set the following:
● The maximum speed for your application.
● The motor and current model: If the motor data in the inverter correspond to the motor
● The inverter calculates the torque limits matching the current limit that you have set for
● The inverter has a preset speed controller with self-optimization (rotating measurement).
Select encoderless vector control
Set p1300 = 20.
Select vector control with encoder
Set p1300 = 21.
Converter with control units CU250D-2
Operating Instructions, 04/2014, FW V4.7, A5E34261542B AA
in rpm) regarding the sign and absolute value.
encoder wiring.
data on the rating plate, then the motor and current model in the inverter are correct and
the vector control can operate satisfactorily.
the basic commissioning.
Regardless of it, you can also set additional positive and negative torque limits or limit the
power of the motor.
If you want to continue to optimize this setting, follow the instructions further down in this
chapter.
Setting functions
8.5 Motor control
141