NORDAC FLEX (SK 200E ... SK 235E) – Users Manual for Frequency Inverters
160
BU 0200 en-US-4920
P317
Field current controller limit
(field current controller limit)
S
P
0 ... 400 V
{ 400 }
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
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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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. The field weakening controller has no function in the basic speed range. For this
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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P319
I-Weak
(field weakening controller I)
S
P
0 ... 800%/ms
{ 20 }
Only affects the field weakening range, see P318 >Field weakening controller P<
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P320
Field weakening limit
(field weakening controller limit)
S
P
0 ... 110 %
{ 100 }
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
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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P321
Speed ctr. I brake off
(speed controller I release time)
S
P
0 ... 4
{ 0 }
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 =
P311 speed control l x 1
1 =
P311 speed control l x 2
2 =
P311 speed control l x 4
3 =
P311 speed control l x 8
4 =
P311 speed control l x 16
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