Siemens 3RS2

7.3 Connection systems........................................................................................................... 63
7.4 Sensor types ...................................................................................................................... 63
7.5 Operator control ................................................................................................................ 64
7.5.1 LEDs .................................................................................................................................. 64
7.5.2 Status display..................................................................................................................... 65
8 Thermocouples .................................................................................................................................... 67
8.1 De󹪝nition........................................................................................................................... 67
8.2 Characteristic curves of thermocouples .............................................................................. 67
9 Resistance sensors............................................................................................................................... 69
9.1 De󹪝nition........................................................................................................................... 69
9.2 Characteristic curves .......................................................................................................... 69
10 Circuit diagrams................................................................................................................................... 71
10.1 Using the 3RS25 analog device to implement a simple 2-step controller.............................. 71
10.2 Using the digital device to implement a simple 2-step controller with simultaneous output
of an alarm value............................................................................................................... 72
10.3 Using the digital device to implement a simple 3-step controller with simultaneous output
of an alarm value............................................................................................................... 73
11 Connection........................................................................................................................................... 75
11.1 Warning notices................................................................................................................. 75
11.2 General information........................................................................................................... 75
11.3 Connection data for terminals ............................................................................................ 76
11.4 Terminal assignment.......................................................................................................... 76
11.5 Connection tool ................................................................................................................. 78
11.6 Connecting the screw terminals ......................................................................................... 79
11.7 Disconnecting screw terminals........................................................................................... 80
11.8 Wiring rules for spring-type terminals (with push-in technology)......................................... 80
11.9 Connect the spring-type terminal (push-in) ........................................................................ 81
11.10 Disconnect the spring-type terminal (push-in) .................................................................... 82
11.11 Attaching the terminals...................................................................................................... 83
11.12 Removing the terminals ..................................................................................................... 84
11.13 Connection of thermocouples and resistance sensors ......................................................... 85
12 Mounting ............................................................................................................................................. 87
12.1 Warning notices................................................................................................................. 87
12.2 Mounting position, installation width/overall depth, layout................................................. 87
12.3 Terminal coding ................................................................................................................. 88
12.4 Mounting on a standard rail ............................................................................................... 88
Table of contents
3RS2 temperature monitoring relay
Equipment Manual, 02/2022, A5E42462552002A/RS-AB/002 5