West Control Solutions TB 45 Temperature Monitor - Manual (Page 21)

. 6 Functions
The signal data flow of temperature monitor TB 45 is shown in the following diagram:
6.1 Limiting functions
TB 45 can be configured for various functions:
• as a temperature monitor
• as a limit signaller
6.1.1 Temperature monitor
The selected temperature monitor function monitors the process value. When the process value is above the adjusted
high limit value LC or below the adjusted low limit value LC (configurable), output relay LC is opened and disabled.
Release is automatic, when
– the process value is below the adjusted high limit value LC (minus any adjusted hysteresis) again with setting
”Temperature monitor max.”, or when the process value is above the adjusted low limit value LC (plus any
adjusted hysteresis) again with setting “Temperature monitor min.”.
g
When display element TB is lit, a temperature monitor function is selected.
a
Please, note that the adjusted filter time t.F1 can increase the response time for the process value. The
DIN-tested response times were tested with t.F1 = 0,5 s.
Limit values Lim.2, Lim.3 can be used as pre-alarms for (optional) output on OUT.2, OUT.3.
6.1.2 Limit signaller
A selected limit signalling function monitors the process value. When exceeding the adjusted limit values L.1 / H.1 ,
output relay LC is opened (see also chapter Limit values!)
Limit values Lim.2, Lim.3 can be used as pre-alarms for (optional) output on Out.2, Out.3.
Functions
TB 45 Limiting functions 21