Siemens 7SR105 Rho - Page 176

7SR105 Rho and 7SR17 Rho Applications Guide
©2018 Siemens Protection Devices Chapter 7 Page 3 of 31
List of Figures
Figure 2-1 Thermal Overload Protection ........................................................................................................ 5
Figure 2-2 Summary of Protection Settings Calculation Procedure ................................................................. 6
Figure 2.1-3 Thermal Heating (Cold) Characteristics ......................................................................................... 8
Figure 2.1-4 Effect of Hot/Cold Curve Ratio Setting on Thermal Overload Operate Time .................................... 9
Figure 2-5 Thermal Overload Protection ...................................................................................................... 10
Figure 2.1-6 Start Time Less Than Stall Withstand Time ................................................................................. 11
Figure 2.1-7 Start Time Greater Than Locked Rotor Withstand Time ............................................................... 11
Figure 2.2-1 Setting Example – Motor Circuit Data .......................................................................................... 13
Figure 2.2-2 Summary of Thermal Settings ..................................................................................................... 16
Figure 2.5-1 Earth Fault Protection Applications.............................................................................................. 18
Figure 2.6-1 Restricted Earth-fault protection .................................................................................................. 19
Figure 4-1 Logic Diagram: Trip Circuit Supervision Feature (74TCS) ............................................................ 24
Figure 4-2 Logic Diagram: Close Circuit Supervision Feature (74CCS) ......................................................... 24
Figure 4-3 Trip Circuit Supervision Scheme 1 (H5) ....................................................................................... 25
Figure 4-4 Trip Circuit Supervision Scheme 2 (H6) ....................................................................................... 25
Figure 4-5 Trip Circuit Supervision Scheme 3 (H7) ....................................................................................... 26
Figure 4-6 Close Circuit Supervision Scheme .............................................................................................. 26