7.5 Control parameters
BU 0750 GB Technical design subject to change 91
Setting value / Description / Note
The field weakening limit defines the speed / voltage upwards of which the controller will start to
weaken the field. If the value is set to 100%, the controller will start to weaken the field approxi-
mately at the synchronous speed.
If the settings made in P314 and/or P317 are considerably higher than the default values, it is rec-
ommended to reduce the field weakening limit accordingly to ensure that current controller action will
be possible throughout the control range.
The I component of the speed controller will be increased for as long as it takes to release the me-
chanical brake (P107/P114). As a result the load is taken up more securely and effectively especially
if the motion is vertical.
0 = P311 x 1
1 = P311 x 2
2 = P311 x 4
3 = P311 x 8
4 = P311 x 16
The actual speed information transmitted from an incremental shaft encoder to the inverter can be
used to execute a number of functions, such as:
0 = Speedmeas. servomode: The actual motor speed value is used in the servo mode of the
inverter. It is not possible to disable ISD control.
1 = PID actual frequency: Speed control is performed on the basis of the actual speed value of
a system. Possible uses of this function include the speed control of a motor with a linear
characteristic curve. Even an incremental encoder which is not installed directly on the mo-
tor can be used to control the motor speed. P413 to P416 will determine the mode of con-
trol.
2 = Frequency addition: The measured speed is added to the current setpoint.
3 = Freq. subtraction: The measured speed is subtracted from the current setpoint.
4 = Maximum frequency: The maximum output frequency / speed available is limited accord-
ing to the speed the shaft encoder will allow.
If the incremental shaft encoder is not mounted directly on the motor shaft, the correct transmission
ratio between motor speed and encoder speed should be selected in this parameter.
speed encoder
speed motor
P326
Not unless P325 = 1, 2, 3 or 4, in other words not in the servo mode (control of motor speed)
The admissible contouring error can be limited to a definite maximum value. When the limit value set
here is reached, the FI will disconnect the output signalling error no. E013.1.
0 = OFF
Not unless P325 = 0, that is in the servo mode (control of motor speed)
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