Checking The Encoder Signal - Siemens SINAMICS G120D Series Operating Instructions Manual

Advanced commissioning
7.5 Motor control
To achieve a satisfactory response of the controller, you must set at least the subfunctions
shown with a gray background in the figure above to adapt them to your application:
● Motor and current model: In the basic commissioning, set the motor data correctly for the
connection type (Y/Δ) according to the nameplate and perform stationary motor data
identification.
● Speed limits and torque limits: In the basic commissioning, set the maximum speed
(p1082) and current limit (P0640) for your application. When you have completed basic
commissioning, the inverter calculates the torque and power limits to match the current
limit. The actual torque limits result from the converted current and power limits and the
set torque limits.
● Speed controller: Use rotating measurement of the motor data identification. If rotating
measurement is not possible, you must optimize the controller manually.
Vector control with encoder
Instead of the calculated speed from the motor model, the vector control with encoder
evaluates an encoder.
7.5.2.1

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
in rpm) regarding the sign and absolute value.
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
encoder wiring.
You have ensured that the scaling and polarity of the encoder signal are correct.
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Converter with control units CU240D-2
Operating Instructions, 04/2015, FW V4.7.3, A5E34262100B AB