Appendix: Permanent magnet synchronous motors (PMSMs) 433
Start mode
The default value of parameter
is 1 (AUTO). In most cases
this is suitable for starting the rotation. If fast start with low inertia is required, it is
recommended to set parameter
to 2 (DC MAGN).
Smooth start
The Smooth start function can be used if the motor is not able to start or when
rotation at low speeds needs to be improved. The following table lists the needed
parameter settings.
Speed controller tuning
In vector control mode, it is recommended to tune the speed controller. In
applications where the motor can be rotated freely, automatic tuning can be used.
See parameter
for more information.
Usually it is enough to adjust the proportional gain (parameter
) of
the speed controller to a higher value. The default value is 5 which results in rather
conservative speed controller tuning. Increase the proportional gain value by 5 until
the performance is satisfactory. If the application becomes unstable, divide the last
gain value by 2, and you have reached rather robust speed controller tuning.
Note:
It is recommended to use encoder feedback if accurate torque control, high
torque production, or sustained operation is required at low speeds (below 20% of the
motor nominal speed).
Adjusting motor speed estimation gain in case of an over current
failure
The inertia of the PM motor application may cause over current trips. If the drive fails
constantly to over current with the PM motor (Fault 01), the speed estimation gain
may need to be adjusted. This is done by changing the parameter
No.
Name
Value
Description
Default
0
1
2
Disabled
Enabled always
Start only
0
10…100% Current applied to the motor when the Smooth start
is active. Increasing the current helps enable starting
with a load or with a large inertia. Decreasing the
current can prevent the rotor from turning into a
wrong direction during the start.
50%
2…100%
Set the smooth start frequency range as small as
possible. This should be tuned so that the rotation is
stable throughout the whole speed range.
10%
Summary of Contents for ACS355 series
Page 1: ...ABB machinery drives User s manual ACS355 drives ...
Page 4: ......
Page 16: ...16 ...
Page 32: ...32 Operation principle and hardware description ...
Page 58: ...58 Electrical installation ...
Page 74: ...74 Start up control with I O and ID run ...
Page 106: ...106 Control panels ...
Page 120: ...120 Application macros ...
Page 178: ...178 Program features ...
Page 338: ...338 Fieldbus control with embedded fieldbus ...
Page 368: ...368 Fault tracing ...
Page 404: ...404 Dimension drawings ...
Page 410: ...410 Appendix Resistor braking ...
Page 434: ...434 Appendix Permanent magnet synchronous motors PMSMs ...