Functional Software description
DCS 500 Software Description
73
0.5
1.0
5.0
10
100
100
120
140
160
180
200
240
260
Current
Id/ %
Time (min
Figure
50
Example of motor loadability curve.
Note
. This is an example and does not necessarily
correspond to any actual motor.
Example:
The drive should trip if motor current rises above 170% of motor
nominal current for a time longer than 1 minute. Motor’s preload is
50% of nominal armature current. See the following figure. Pa-
rameter
MODEL1.TC (1409)
value is
150
.
Selected tripping base level is 106%.
MODEL1.TRIP L (1408)
=
1062 /100 = 102.
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