NORD Drivesystems BU0200 User 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)

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)

0 ... 800 % / ms

{ 20 }

Affects only the field weakening range, see P318 >Field weakening controller P<

P320

Weak border

(Field weakening controller border)

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)

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)

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.