Checking The Encoder Signal; Select Motor Control - Siemens SINAMICS G120 Operating 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. Go online.
2. Select closed-loop speed control without encoder in the "Speed controller" screen form.
3. Switch-on the motor with an average speed.
4. Compare parameters r0061 (speed encoder signal in rpm) and r0021 (calculated speed
5. If the signs do not match, invert the speed encoder signal: Set p0410 = 1.
6. 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.
Proceed as follows to check the encoder signal using the operator panel:
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

Speed 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 speed control as control mode in the
basic commissioning, you will already have 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
Converter with the CU250S-2 Control Unit (vector)
Operating Instructions, 06/2013, FW V4.6, A5E31759476B AB
in rpm) regarding the sign and absolute value.
encoder wiring.
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.
Setting functions
8.5 Motor control
249