Temperature Limiter Tb - Siemens 3RS2 Manual

Digital devices
5.4 Special functions
A1/A2
hyst.
11C/14NO
Figure 5-1
A1/A2
ϑ1
hyst
reset
K1
11C/14NO
Figure 5-2
5.4.2

Temperature limiter TB

The temperature limiter (TB) is a device function that locks the device continuously after
tripping. If the sensor temperature overshoots or undershoots the limit by the amount of the
hysteresis, a reset is possible.
This function is only available if at least two sensors are activated and the expansion module is
therefore active. In this case the inputs for the TC sensors and the analog input 4 ... 20 mA are
deactivated.
The following settings can be specified:
• Monitoring for overshoot
• Monitoring for undershoot
• Hysteresis
If the relay output (K1) between the terminals 11C and 14NO is switched off (quiescent current
principle), the device is in the safe state. This status is maintained in the valid range of the device
until manually unlocked.
A parameter change is prevented by a 3-digit code.
28
DEV.MODE = TW
MON.MODE = Over
ϑ1
init
K1
1 1
Safety function temperature monitor
DEV.MODE = TB/ATEX
MON.MODE = Over
init
1 1
Temperature limiter safety function
DEV.MODE = TW
MON.MODE = Under
A1/A2
hyst.
ϑ1
init
K1
1
11C/14NO
DEV.MODE = TB/ATEX
MON.MODE = Under
A1/A2
hyst.
ϑ1
reset
init
K1
1
11C/14NO
Equipment Manual, 02/2022, A5E42462552002A/RS-AB/002
1
1
3RS2 temperature monitoring relay