Function 51 Iac Pickup And Reset - Siemens SINAMICS PERFECT HARMONY GH180 Function Manual

Advanced Motor Protection and RTD Protection Functions
6.18 Device 51 - Fixed Inverse Time Overcurrent
Figure 6-34
6.18.4

Function 51 IAC Pickup and Reset

Pickup and Reset Curve Equations and Tables
Pickup time as a function of current as well as the reset time are shown for IAC curves as shown
in the following paragraphs.
102
5.5
5
4.5
4
3.5
3
2.5
2
1.5
0 0.1 0.2
stator current to pickup current ratio
ANSI Moderately Inverse Reset Time
ANSI
moderately inverse reset time
TDM=1.0
0.3 0.4 0.5
Advanced Motor Protection for Variable Speed Operation
0.6 0.7 0.8
Manual, AA, A5E46373908A
0.9