Power Electronics SD 300 Series, Getting Started Manual

Page: 147 / 354

POWER ELECTRONICS SD300
DESCRIPTION OF PROGRAMMING PARAMETERS
145
Cn.33
PM D-axis
back-EMF
estimated gain
(%)
100.0%
0 –
300.0%
Adjusts the gain of the velocity speed
estimator on the D axis of the back EMF for
the permanent magnet motor control. Set
these values as a percentage of the
proportional gain to have a stable polarity
estimator. Higher values result in faster
responses, with greater possibilities of
motor vibration. Excessively low values can
cause motor starting failure due to a slow
response rate.
For short acceleration ramps, a low value in
Cn.33 is recommended (less than 100%),
but the initial torque could decrease. With
fast ramps, it is recommended to increase
the value of Cn.33
Note: Visible parameter if dr.9 = PM
Sensor-less
NO
Cn.34
PM Q-axis
back-EMF
estimated gain
(%)
100.0%
0 –
300.0%
Adjusts the gain of the speed estimator on
the Q axis of the back EMF for the
permanent magnet motor control. Set these
values as a percentage of the proportional
gain to have a stable polarity estimator.
Higher values result in faster responses,
with greater possibilities of motor vibration.
Note: Visible parameter if dr.9 = PM
Sensor-less
NO
Cn.35
Nº de
reintentos
estimación
posición inicial
del polo
2 0 – 10
Allows adjusting the number of retries to
estimate the initial position of the pole.
The initial detection of the pole position is a
process that coincides with the position of
the rotor calculated by the drive and the
actual position of the rotor in a motor. In a
permanent magnet synchronous motor
(PM), the rotor flux is generated by the
permanent magnet attached to the rotor.
Therefore, to operate the motor in vector
control mode, the exact position of the rotor
(flow position) must be detected for a
precise control of the torque generated by
the motor.
Note: Visible parameter if dr.9 = PM
Sensor-less
NO