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NORDAC FLEX (SK 200E ... SK 235E) – Users Manual for Frequency Inverters

Field current controller limit

P317

(field current controller limit)

0 ... 400 V

Determines the maximum voltage span of the field current controller. The higher the value, the

greater the maximum effect that can be exercised by the field current controller. Excessive values

{ 400 }

in P317, in particular, can lead to instability during transition to the field weakening range (see

P320). The values for P314 and P317 should always be set roughly the same so that the field and

torque current controllers are balanced.

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P-Weak

P318

(field weakening controller P)

0 ... 800 %

The field weakening controller reduces the field setpoint when the synchronous speed is

exceeded. The field weakening controller has no function in the basic speed range. For this

{ 150 }

reason, the field weakening controller only needs to be set if speeds are set above the rated

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.

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I-Weak

P319

(field weakening controller I)

0 ... 800%/ms

Only affects the field weakening range, see P318 >Field weakening controller P<

{ 20 }

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Field weakening limit

P320

(field weakening controller limit)

0 ... 110 %

The field weakening limit determines the speed/current at which the controller begins to weaken

the field. At a set value of 100% the controller begins to weaken the field at approximately the

{ 100 }

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 reduced accordingly so that the control range is actually available to

the current controller.

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Speed ctr. I brake off

P321

(speed controller I release time)

0 ... 4

The I component of the speed controller is increased during the brake release time (P107/P114).

This leads to better load take-up, especially with suspended loads.

{ 0 }

0 = P311 speed control l x 1

1 = P311 speed control l x 2

2 = P311 speed control l x 4

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