Nord Drivesystems SK 510P - Page 97

5 Parameter
BU 0600 en-2319 97
P244 Peak current PMSM S P
Setting range
0.1 … 1000.0 A
Factory setting { 5.0 }
Description
This parameter contains the peak current of a synchronous motor. The value must be
obtained from the motor data sheet.
P245 Power system stabilisation PMSM VFC S P
Setting range
5 … 250 %
Factory setting
{ 25 }
Description
"Oscillation damping PMSM VFC". In VFC open-loop mode, PMSM motors tend to
oscillate due to insufficient intrinsic damping. With the aid of oscillation damping this
tendency to oscillate is counteracted by electrical damping.
P246 Mass Inertia PMSM S P
Setting range
0.0 … 1000.0 kg*cm²
Factory setting { 5.0 }
Description
The mass inertia of the drive system can be entered in this parameter. For most
applications the default setting is sufficient. However, for highly dynamic systems the
actual value should ideally be entered. The values for the motors can be obtained
from the technical data. The portion of the external centrifugal mass (gear unit,
machine) must be calculated or determined experimentally.
P247 Switchover frequency VFC PMSM [%] S P
Setting range
1 ... 100 %
Factory setting
{ 25 }
Description
"Switchover frequency VFC PMSM". In order to provide a minimum amount of torque
immediately in case of spontaneous load changes, in VFC mode the setpoint of I
d
(magnetisation current) is controlled depending on the frequency (field increase mode)
The value of this additional field current is
determined by parameter (P210). This
reduces linearly to the value "zero", which
is reached at the frequency which is
governed by P247. In this case, 100 %
corresponds to the rated motor frequency
from P201.