NORD Drivesystems BU0200 - Manual (Page 191)

SK 200E Manual for frequency inverters
190 Subject to technical alterations BU 0200 GB-4411
Parameter
{Factory setting}
Setting value / Description / Note Device Supervisor Parameter set
P318
P-Weak
(Field weakening controller P)
S P
0 ... 800 %
{ 150 }
The field weakening controller reduces the field setpoint when the synchronous speed is
exceeded. Generally, the field weakening controller has no function; for this reason, the field
weakening controller only needs to be set if speeds are set above the nominal motor speed.
Excessive values for P318 / P319 will lead to controller oscillations. The field is not weakened
sufficiently if the values are too small or during dynamic acceleration and/or delay times. The
downstream current controller can no longer read the current setpoint.
P319
I-Weak
(Field weakening controller I)
S P
0 ... 800 % / ms
{ 20 } Affects only the field weakening range, see P318 >Field weakening controller P<
P320
Weak border
(Field weakening controller border)
S P
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
Speedctr.I brake off
(Speed control I brake delay off)
S P
0 ... 4
{ 0 }
During the brake release 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 = P311 speed ctrl I x 1
1 = P311 speed ctrl I x 2
2 = P311 speed ctrl I x 4
3 = P311 speed ctrl I x 8
4 = P311 speed ctrl I x 16
P325
Function encoder
(Function encoder)
S
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 meas servo mode, "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, "PID actual frequency value": The actual speed 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 that is not mounted directly onto the motor. P413
– P416 determine the control.
2 = Frequency addition: The speed determined is added to the actual setpoint value.
3 = Freq subtraction, "Frequency subtraction": The speed determined is subtracted from
the actual setpoint.
4 = Maximum frequency: The maximum possible output frequency / speed is limited by the
speed of the encoder.