nord NORDAC FLEX SK 200E Series User Manual page 154

NORDAC FLEX (SK 200E ... SK 235E) – Users Manual for Frequency Inverters
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Auto. magn. adjustment
P219
(automatic magnetization adjustment)
25 ... 100 %/101 With this parameter, magnetization can be automatically matched to the motor load so that energy
consumption is reduced to the actual requirement. P219 is a limiting value, to which the field in the
{ 100 }
motor can be reduced.
The value is set to 100% by default and therefore no reduction is possible. A minimum of 25% can
be set.
The field is reduced with a time constant of approx. 7.5 s. Upon load increase 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
magnetization current and the torque current are approximately equal, so that the motor is operated
with optimum efficiency. No field increase above the setpoint is provided.
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 since it adapts the voltage to the
load.
This parameter does not function for the operation of synchronous motors (IE4 motors).
NOTE:
101 = automatic, with the setting P219=101 an automatic magnetization current controller is
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P2xx Control/characteristic curve parameter
NOTE:
"typical"
Settings for... Current vector control (factory setting)
P201 to P209 = motor data
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154
This must not be used for lifting gears or applications where a more rapid build-up of
the torque is required, as otherwise there would be overcurrent switch-offs or motor
stalling on sudden changes of load because the missing field will have to be
compensated by a disproportionate torque current.
activated. The ISD controller then operates with a subordinate flow controller which
improves the slippage calculation, especially at higher loads. Rise times are
considerably faster compared to normal ISD control (P219 = 100).
Output
voltage
P204
P215
P210
P216
P210 = 100%
P211 = 100%
P212 = 100%
P213 = 100%
P214 = 0%
P215 = no significance
P216 = no significance
P211
P201
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 derivative action)
P216 = 0 s (dyn. boost time)
S
Output frequency
Time
BU 0200 en-US-4920