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

. 6 Functions
The signal data flow of temperature limiter TB 45 is shown in the following diagram:
6.1 Limiting functions
TB 45 can be configured for various functions:
• as a temperature limiter
• as a temperature monitor
• as a limit signaller
6.1.1 Temperature limiter
If selected, a temperature limiter fun ction monitors the process value. When exceeding the (configurable) low or high
limit value LC, the output relay LC is opened and disabled.
Releasing is possible only, when
– the process valueis below the adjusted high limit value LC (minus any adjusted hysteresis) again with setting
” Temperature limiter max. (latch) ”, or when the process value is above low limit value LC (plus any adjusted
hysteresis) again with setting “Temperature limiter min. (latch)”.
– reset via digital input di1 or via the reset key combination (selectable) occurred. The reset key combination can
be disabled by means of a password (setting in BlueControl ® : Configuration / Others / IRES = 1).
g
When display element TB is lit, a temperature limiter 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.
Functions
TB 45 Limiting functions 21
Linearization
Scaling/
Correction
INP1
Min*
Max*
Func 1
Limit value
Scaling
INP
OUT3*
(analog)
OUT2
Display
di1
* Option
OUT3*
LC