Advanced commissioning
6.15 Motor control
Converter with the control units CU240D-2
Operating Instructions, 04/2018, FW V4.9 SP10, A5E34262100B AF
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6.15.2.2
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
1.
Set the control mode "encoderless 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.
❒
6.15.2.3
Optimizing the speed controller
Optimum control response - post optimization not required
Preconditions for assessing the controller response:
●
The moment of inertia of the load is constant and does not depend on the speed
●
The inverter does not reach the set torque limits during acceleration
●
You operate the motor in the range 40 % … 60 % of its rated speed
If the motor exhibits the following response, the speed control is well set and you do not
have to adapt the speed controller manually:
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.
