NORD Drivesystems BU0750 - Manual (Page 92)

NORDAC SK 750E Manual
92 Subject to technical amendments BU 0750 GB-3311
Parameter Setting value / Description / Note
Parameter
set
Available with option
P320 Field weakening controller limit P
ENC POS
0...110 %
[ 100 ] The field weakening limit determines at which speed / current the controller will begin to weaken the
field. At a set value of 100% the controller will begin to weaken the field at approximately the
synchronous speed.
If values much larger than the standard values have been set in P314 and/or P317, then the field
weakening limit should be correspondingly reduced, so that the control range is actually available to
the current controller.
P321 Increase speed control I P
ENC POS
0... 4
[ 0 ] During the brake release time (P107/P114), the I-component of the speed control is increased. This
results in better load take-up, especially with hanging loads.
0 = P311 x 1
1 = P311 x 2
2 = P311 x 4
3 = P311 x 8
4 = P311 x 16
P325 Encoder function P
ENC POS
0...4
[ 0 ] The actual speed list value supplied by an incremental encoder to the FI can be used for various
functions in the FI.
0 = Speed measurement Servo mode: The actual motor speed list value is used for the FI
servo mode. In this function the ISD control cannot be switched off.
1 = PID actual frequency value: The speed list value of a system is used for speed control.
This function can also be used for controlling a motor with a linear characteristic curve. It is
also possible to use an incremental encoder for speed control which is not mounted directly
onto the motor. P413
– P416 govern the control.
2 = Frequency addition: The determined speed is added to the actual setpoint value.
3 = Frequency subtraction: The determined speed is subtracted from the actual setpoint.
4 = Maximum frequency: The maximum possible output frequency / speed is limited by the
speed of the encoder.
P326 Encoder transformation ratio P
ENC POS
0.01...200.0
[ 1.00 ] If the incremental encoder is not mounted directly onto the motor shaft, then the respectively correct
transformation ratio of motor speed to encoder speed must be set.
speed encoder
speed motor
P326

Only when P325 = 1, 2, 3 or 4, therefore not in Servo mode (motor speed control)
P327 Slip error limit P
ENC POS
0..0.3000 rpm
[ 0 ] The limit value for a permitted maximum slip error can be set. If this value is reached, the FI
switches off and indicates error E013.1.
0 = OFF
Only when P325 = 0, therefore in Servo mode (motor speed control)