6. Control Functions and Parameter Settings
6-78
6-7-5 Current regulator (IM)
The current regulator (ACR) is a PI type control, including the following parameters.
Parameter
No.
Parameter
Function
A11-0
ACR response
Set the ACR response in radians.
If the response is too low or too high, the current will become
unstable, and the over current protection will function.
A11-1
ACR time constant
The ACR time constant is set.
If the time constant is too long or too short, the current will
become unstable, and the over current protection will
function.
B13-7
ACR gain compensation in
constant power range
This sets the ACR Proportional gain compensation value at
the max. speed. (above base speed)
B32-4
ACR voltage model FF
selection
The voltage fluctuation caused by the leakage inductance is
feed forward controlled.
The current regulator (ACR) response speed will be
increased. Select this if the current hunts in the high-speed
operation range during sensor-less control.
6-7-6 Flux observer and speed estimation mechanism (IM)
These are parameters used with speed sensor-less vector control.
Parameter
No.
Parameter
Function
B31-0
Flux observer gain
This is the feedback gain for the flux observer.
If hunting occurs at the estimated speed in the high-speed
operation range, adjust within the range of 1.2 to 0.9.
B31-1
Speed estimated
proportional gain
This is the proportional gain for the adaptive speed
estimation mechanism. To increase the speed estimation
response, set a large value. Note that if the value is too high,
the speed estimation value will hunt.
B31-2
Speed estimated integral
gain
This is the integral gain for the adaptive speed estimation
mechanism. To increase the speed estimation response, set
a large value. Note that if the value is too high, the speed
estimation value will hunt.
