Siemens SINAMICS PERFECT HARMONY GH180 Function Manual page 106

Advanced Motor Protection and RTD Protection Functions
6.18 Device 51 - Fixed Inverse Time Overcurrent
Figure 6-37
104
2
10
1
10
0
10
-1
10
1
1.5
IAC Extremely Inverse Pickup Time
IAC
extremely inverse curve
TDM=1.0
2
2.5 3
stator current to pickup current ratio
Advanced Motor Protection for Variable Speed Operation
4
3.5 4.5
Manual, AA, A5E46373908A
5