Temperature Monitor Tw - Siemens 3RS2 Manual

Digital devices
5.4 Special functions
5.4.3

Temperature monitor TW

The temperature monitor (TW) is a device function in which the device is automatically reset on
activation, as soon as the sensor temperature has overshot or undershot the set limit by the
hysteresis value.
The possible settings include the monitoring for limit value overshoot and undershoot, as well
as the monitoring of the hysteresis. If the relay output (K1) between terminals 11C and
14NO (quiescent current principle) is switched off, the device is in the safe operating state.
A parameter change is prevented by a 3-digit code.
ϑ1> 2
ϑ1<ϑ2
Figure 5-5
30
DEV. MODE = TW
MON. MODE = Over
A1/A2
ϑ1
hyst.
ϑ2
hyst.
ϑ
init
K1
1
K2
2
A1/A2
ϑ2
hyst.
ϑ1
hyst.
init
K1
1
K2
2
K1
11C/14NO
11C/12NC
11C
12NC
Temperature monitor time diagram
DEV. MODE = TW
MON. MODE = Under
A1/A2
hyst.
ϑ 1
hyst.
ϑ2
init
K1
1 1
K2
2 2
A1/A2
hyst.
ϑ2
hyst.
ϑ1
init
1 K1
1
2 K2
2
K2
1
21C/24NO
21C/22NC
14NO 12NC 21C
14NO 11C 22NC 24NO
Equipment Manual, 02/2022, A5E42462552002A/RS-AB/002
1
2
1
2
2
24NO 22NC
21C
3RS2 temperature monitoring relay