Power Electronics SD 300 Series, Getting Started Manual

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POWER ELECTRONICS SD300
COMMONLY USED CONFIGURATIONS
311
7. Speed and flux estimator loops
Set these parameters to change the speed estimator gain during a PM
synchronous motor operation in sensorless vector control mode.
If fault trips occur or excessive oscillation is observed at low speed,
decrease the Cn.41 value in 10% decrements until the motor operates
stably.
If ripples occurs during normal operation, increase the value at Cn. 42.
The values at Cn.43 and Cn.44 are used for low speed operations in 200
V motors.
Set the high speed portion of the forward speed versus the counter the
back-EMF during a PM synchronous motor operation in sensorless vector
control mode. Feed forwarding enhances operation of the speed
estimator.
Increase the value at Cn.45 in 10% increments to suppress motor
oscillation under load. A fault trip may occur if this value is set too high
It is not recommended modifing these parameters, the default values are
valid for the 90% of the applications.
Parameter
Default
value
Description Set value
Cn.41 100
PM speed estimator proportional gain
100
Cn.42 10
PM speed estimator integral gain
10
Cn.43 300
PM speed estimator proportional gain 2
300
Cn.44 30
PM speed estimator integral gain 2
30
Cn.45 300%
Speed estimator feedforward high speed range (%)
300%