NORD Drivesystems BU0750 - Manual (Page 88)

NORDAC SK 750E Manual
88 Subject to technical amendments BU 0750 GB-3311
Parameter Setting value / Description / Note Parameter
set
Available with option
P207 Motor circuit P Always visible
0 ... 1
[

]
0 = Star 1 = Delta
The motor circuit is decisive for stator resistance measurement and therefore for current vector
control.
P208 Stator resistance P Always visible
0.00...300.00

[

]
Motor stator resistance

resistance of one line in the DC motor.
Has a direct influence on the current control of the FI. Too high a value will result in a possible
overcurrent; too low a value will result in a motor torque which is too low.
For simple measurement, this parameter can be set to "Zero". Pressing the ENTER key initiates
the automatic measurement between two motor phases. In the FI, the resistance on the line is
measured on the basis of the delta or star circuit (P207) and the value saved.
Note: For optimum functioning of the current vector control, the stator resistance must be
automatically measured by the FI.
The motor must not be disconnected from the FI during the measurement!
P209 No load current P Always visible
0.1..00.5400.0 A
[

]
This value is always calculated automatically from the motor data if there is a change in the
parameter >cos

< P206 and the parameter >Nominal current< P203.
Note: If the value is to be entered directly, then it must be set as the last motor data. This is
the only way to ensure that the value will not be overwritten.
P210 Static boost increase P Always visible
0 ... 400 %
[ 100 ] The static boost affects the current which generates the magnetic field. This is equivalent to the
no load current of the particular motor and is therefore independent of the load The no load
current is calculated using the motor data. The factory setting of 100% is sufficient for normal
applications.
P211 Dynamic boost increase P Always visible
0 ... 150 %
[ 100 ] The dynamic boost affects the torque generating current and is therefore a load-dependent
parameter. The factory 100% setting is also sufficient for typical applications.
Too high a value can result in an overcurrent in the FI. Under load therefore, the output voltage
will be raised too sharply. Too low a value will result in insufficient torque.
P212 Slip compensation P Always visible
0 ... 150 %
[ 100 ] The slip compensation increases the output frequency, dependent on load, to keep the speed of
an asynchronous motor approximately constant.
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 operated with one FI, the slip compensation P212
must be set to 0%. This excludes any negative influences. This also applies to synchronous
motors which do not have slip due to their design.
P213 ISD control loop gain P Always visible
25 ... 400 %
[ 100 ] This parameter influences the control dynamics of the FI current vector control (ISD control).
Higher settings make the controller faster, lower settings make it slower.
Dependent on application type, this parameter can be altered, e.g. to avoid unstable operation

These setting values depend on the selection in parameter P200.