NORDAC SK 5xxE Manual
84 Subject to technical alterations BU 0500 GB
Parameter Set value / Description / Note Device Supervisor
Parameter
set
P320 Weak field control limit
SK 520E
and above
S P
0 ... 110 %
[ 100 ]
The weak field 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 reduce 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
weak limit should be correspondingly reduced, so that the control range is actually available to the
current controller.
P321 Speed control I brake off
SK 520E
and above
S P
During brake ventilation time (P107/P114), the I-component of the rotation speed control is
increased. This leads to better load take-up, especially with vertical movements.
0 ... 4
[ 0 ]
0 = P311 x 1
1 = P311 x 2
2 = P311 x 4
3 = P311 x 8
4 = P311 x 16
P325 Encoder function
SK 520E
and above
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 = Rotation speed measurement Servo mode: The actual motor speed list value is used
for the FI servo mode. The ISD control cannot be switched off in this function.
1 = PID actual frequency value: The actual rotation speed of a system is used for rotation
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
that is not mounted directly onto the motor. P413 – P416 determine the control.
2 = Frequency addition: The rotation speed deduced is added to the current 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
SK 520E
and above
0.01 ... 100.0
[ 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, speed control
SK 520E
and above
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)
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