NORD Drivesystems BU0180 - Manual (Page 118)

SK 180E Manual for frequency inverters
118 Pre-series version BU 0180 GB-0914
Parameter
{Factory setting}
Setting value / Description / Note Device Supervisor
Parameter
set
P525 … P529 Load monitoring
With the load monitoring, a range can be specified within which the load torque may change
depending on the output frequency. There are three auxiliary values for the maximum
permissible torque and three auxiliary values for the minimum permissible torque. A frequency
is assigned to each of these auxiliary values. No monitoring is carried out below the first and
above the third frequency. In addition, the monitoring can be deactivated for minimum and
maximum values. As standard, monitoring is deactivated.
P527 [-01] P527 [-02] P527 [-03]
f
soll
I
sq
P525 [-01]
P525 [-03]
P526 [-03]
P525 [-02]
P525 [-02]
P525 [-01]
The time after which a fault is triggered can be set with parameter (P528). If the permissible
range is exceeded (Example diagram: Infringement of the area marked in yellow or green), the
error message E12.5 is generated unless parameter (P529) does not suppress the triggering of
an error.
A warning C12.5 is always given after the elapse of half of the set error triggering time (P528).
This also applies if a mode is selected for which no fault message is generated. If only a
maximum or minimum value is to be monitored, the other limit must be deactivated or must
remain deactivated. The torque current and no the calculated torque is used as the reference
value. This has the advantage that monitoring in the "non field weakened range" is usually more
accurate. Naturally however, it cannot display more than the physical torque in the weakened
field range.
All parameters depend on parameter sets. No differentiation is made between motor and
generator torque, therefore the value of the torque is considered. As well as this, there is no
differentiation between "left" and "right" running. The monitoring is therefore independent of the
prefix of the frequency. There are four different load monitoring modes (P529).
The frequencies, and the minimum and maximum values belong together within the various
array elements. The frequencies do not need to be sorted according to their magnitude in the
elements 0, 1 and 2, as the frequency inverter does this automatically.