NORD Drivesystems BU0200 - Manual (Page 187)

SK 200E Manual for frequency inverters
186 Subject to technical alterations BU 0200 GB-4411
Parameter
{Factory setting}
Setting value / Description / Note Device Supervisor
Parameter
set
P219
Auto. magn. adjustment
(Automatic magnetisation adjustment)
S
25 ... 100 % / 101
{ 100 }
With this parameter, an automatic adjustment of the magnetic flux to the motor load can be
made. 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 sec. 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 t
hat the motor is operated with “optimum efficiency”. An increase of the field above the
setpoint value is not 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.
NOTE: This must not be used for lifting or applications where a more rapid build-up of the
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 need to
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)
P2xx Control/characteristic curve parameters
NOTE: "typical"
P211
P210
P204
P201
P216
P215
Output
voltage
Output frequency
Time
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% (dynamic boost)
P216 = 0s (time dyn. boost)