West-control-solutions TB 45 Temperature Limiter Manuel d'utilisateur télécharger pdf (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.

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.

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

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West-control-solutions TB 45 Temperature Limiter Manuel d'utilisateur Page 25