West Control Solutions TB 45 Temperature Limiter - Manual (Page 25)

6.4 Filter
A first order mathematic filter can be used for the input values. The time constant is adjustable. This low-pass filter is
used for suppression of process-dependent interference on the input leads. The higher the value, the better the filter
effect, but the longer the input signal delay.
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.
monitoring is possible via the limit values.
6.5 Limit value processing
The main alarm acts on the process value and is firmly allocated to relay output LC the output action of which is set to
inverse continuously. With the temperature limiter/monitor function, the limit value is adjusted by means of parameter
LC. With the limit signaller function, the limit value is adjusted via
L.1 / H.1. The limit value switching difference
HYS.1 is adjustable.
Max. two further limit values can be configured as pre-alarms and allocated to the individual outputs Out.2....
Out.3.
Several signals assigned to an output are logically ORed.
g
The signal to be monitored can be selected separately for each alarm via configuration. The following
signals are available:
Main alarm LC
• Process value (display value)
Pre-alarms Lim.2 / Lim.3
• Process value (display value)
•
Measured value INP1
Functions
TB 45 Filter 25