Nord Drivesystems NORDAC FLEX SK 200E Series User Manual page 150

NORDAC FLEX (SK 200E ... SK 235E) – Users Manual for Frequency Inverters
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Slip compensation
P212
(slip compensation)
0 ... 150 % Slip compensation increases the output frequency depending on load in order to keep the DC
asynchronous motor speed approximately constant.
{ 100 }
The factory setting of 100% is optimal when using DC asynchronous motors and correct motor data
has been set.
If several motors (different loads or outputs) are run with one VFD, set slip compensation P212 to
0%. This excludes any negative effects. With PMSM motors, the parameter must be left at the
factory setting.
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With certain applications, particularly those with high centrifugal mass (e.g. fan drives), it may be
necessary to control the motor with the aid of a U/f characteristic curve. In order to do this, set
parameters P211 and P212 each to 0%.
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ISD ctrl. loop gain
P213
(amplification ISD control)
25 ... 400 % This parameter affects the control dynamics of the VFD current vector control (ISD control). Higher
settings make the controller faster, lower settings slower.
{ 100 }
Depending on the type of application, this parameter can be adjusted to avoid unstable operation
for example.
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Torque precontrol
P214
(torque derivative action)
-200 ... 200 % This function allows a value for the expected torque requirement to be set in the current controller.
This function can be used in lifting gears for better load transfer during startup.
{ 0 }
NOTE:
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Boost precontrol
P215
(boost derivative action)
0 ... 200 % Only advisable in linear characteristic curves (P211 = 0% and P212 = 0%).
{ 0 } For drives that require a high starting torque, this parameter provides an option for adding an
additional current during the start phase. The operative time is limited and can be selected in
parameter P216 >Boost derivative action time<.
All current and torque current limits that may have been set (P112, P536, P537) are deactivated
during the boost derivative action time.
NOTE:
With active ISD control (P211 and/or P212 ≠ 0%), parameterization of P215 ≠ 0 results in incorrect
control.
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150
Information
In clockwise rotary field direction, motor torques are entered with a positive sign, while
regenerative torques are entered with a negative sign. The reverse applies to
counterclockwise rotation.
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V/f characteristic curve
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BU 0200 en-US-3118
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