NORDAC FLEX (SK 200E ... SK 235E) – Users Manual for Frequency Inverters
152 BU 0200 en-3118
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P219
Automatic flux optimisation
(Automatic flux optimisation)
S
25 ... 100 % / 101
{ 100 }
With this parameter, the magnetic flux of the motor can be automatically matched to the motor load,
so that the energy consumption is reduced to the amount which is actually required. P219 is a
limiting value, to which the field in the motor can be reduced.
As standard, the value is set to 100 %, and therefore no reduction is possible. As minimum, 25 %
can be set.
The reduction of the field is performed with a time constant of approx. 7.5 s. On increase of load the
field is built up again with a time constant of approx. 300 ms. The reduction of the field is carried out
so that the magnetisation current and the torque current are approximately equal, so that the motor
is operated with “optimum efficiency”. An increase of the field above the setpoint value i
intended.
This function is intended for applications in which the required torque only changes slowly (e.g.
pumps and fans). Its effect therefore replaces a quadratic curve, as it adapts the voltage to the
load.
This parameter does not function for the operation of synchronous motors (IE4 motors).
NOTE: This must not be used for lifting or applications where a more rapid build-
torque is required, as otherwise there would be overcurrent switch-offs or inversion of
the motor on sudden changes of load, because the missing field would have be
compensated by a disproportionate torque current.
101 = automatic, with the setting P219 =
101 an automatic magnetisation current controller is
activated. The ISD controller then operates with a subordinate magnetizing controller,
which improves the slippage calculation, especially at higher loads. The control times
are considerably faster compared to the Normal ISD control (P219 = 100)
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P2xx Control/characteristic curve parameters
NOTE:
"typical"
Settings for the...
Current vector control (factory setting)
P201 to P209 = Motor data
P210 = 100%
P211 = 100%
P212 = 100%
P213 = 100%
P214 = 0%
P215 = no significance
P216 = no significance
Linear V/f characteristic curve
P201 to P209 = Motor data
P210 = 100% (static boost)
P211 = 0%
P212 = 0%
P213 = no significance
P214 = no significance
P215 = 0% (boost precontrol)
P216 = 0s (time dyn. boost)
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