Eurotherm 3116 PID User's Guide Page 75

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3100/3200 Series
Part No HA028651 Issue 3.0 Mar-06 73
Assume the following settings
SP1 = 70
o
C End.T = SP2 = 20
o
C Ramp Rate (SP.RAT) = 20
o
C/min
The threshold value behaves like a holdback value and can be turned off. A digital output can be configured to operate an external
buzzer, or other form of indication, to alert the operator to the end of the process. It is cancelled by pressing ‘Ack ’
and
.
Threshold value turned off
Threshold value turned on
This now behaves as a simple four segment programmer of two ramps two dwells
Servo to
PV start
THRES = OFF
RUN/RESET
Digital input
RUN Digital O/P = trun
END Digital O/P = t.End
Temp
SP1 (70
o
C)
Time
SP2 (20
o
C)
Ramp
to SP1
at
SP.RAT
DWELL
Ramp
to SP2
at
SP.RAT
This point will also
Servo to PV
TIMER RUNNING
Scrolling
message
TIMER END
Ramp
to SP1
at
SP.RAT
Ramp
to SP2
at
SP.RAT
Servo to
PV start
THRES = +
n
RUN/RESET
Digital input
RUN Digital O/P = t.run
END Digital O/P = t.End
Temp
SP1 (70
o
C)
Time
SP2 (20
o
C)
DWELL
Counting down
TIMER RUNNING TIMER END
Scrolling
message
PV
SP
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