134 Functional description CG Drives & Automation 01-7492-01r1
11.3.8 PI Speed Control [370]
The AC drive has an internal speed controller, which is used
to keep the shaft speed equal to the set speed reference. This
internal speed controller works without an external
feedback.
With the parameters speed P gain [372] and speed I time
[373] the controller can be optimized manually.
Speed PI Autotune [371]
The function speed autotune will perform a torque step
change, and measures the reaction on shaft speed.
It automatically sets the internal speed I time to its optimum
value. The speed PI autotune must be done during
operation with the motor load connected and the motor
running. “Autotune” will be flashing in the display during
the autotune operation. When the test is successfully
concluded, the display will show “Autotune OK!” for 3 s.
Speed P Gain [372]
For adjusting the P gain of the internal speed controller. The
speed P gain must be manually tuned for a faster reaction to
load changes. The speed P gain can be increased until there
is audible noise from the motor and then decreased until the
noise disappears.
Speed I Time [373]
To adjust the time of the internal speed controller see
parameter Speed PI Autotune [371].
371 Spd PI Auto
Default: Off
Off 0
On 1
NOTE: Run the autotune at speed lower than 80% of
the nominal motor speed. Otherwise autotune will fail.
NOTE: RUN command must be activated manually
via Keyboard button.
NOTE: The setting will automatically return to Off
when the autotuning is finished.
NOTE: This menu is only visible if AC drive Mode =
Speed or V/Hz.
372 Spd P Gain
Default: See note
Range: 0.0–60.0
373 Spd I Time
Default: See note
Range: 0.05–100 s
NOTE: The default settings are calculated for a
standard 4-pole motor without load according to the
nominal power of the AC drive.
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