Eurotherm 3116 PID Podręcznik Użytkownika Pobierz pdf (Strona 33)

ENG

3116 User Guide Part No. HA028005ENG Issue 2.0 May 04

6.5 Dwell Timer

A dwell timer (TI.CFG = DWELL) is used to control a process at a fixed temperature for a defined period. The action

which occurs at the end of the timed period depends on the configuration of the END.T parameter.

Notes:

1. If THRES = 2

(for example) timer will show TIMER RUNNING with the RUN beacon on but will not start counting

down until the temperature is, first, within 2

of SP. Then the threshold is ignored.

2. The DWELL period can be reduced or increased when the timer is running. If it is reduced to meet the Time

Elapsed the timer will change to the End state.

3. A-M can only be selected when in reset

4. If the timer is re-configured to a different type or the End Type is re-configured (a dwell, for example), it may be

necessary to reselect Auto mode

RESET Digital Input

TIMER END

OFF

End State end. t =

OFF SP2 dwel

SP2

Temp

SP1

Time

THRES = + n

RUN Digital O/P = t.run

END Digital O/P = t.End

OFF TIMER RUNNING OFF

Scrolling message

Counting

down

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 39 40

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Eurotherm 3116 PID Podręcznik Użytkownika Strona 33