Honeywell DCP551 Mark ΙΙ User Manual page 113

PA17
(PID computation initialize manipulated variable)
Under the conditions listed below, a PID computation starts using the value set in
PA17
• When there is a mode change from READY AUTO to RUN AUTO.
• When the controller is powered up in RUN (or HOLD, FAST, END) AUTO mode.
• When auto-tuning ends.
Since the PV, SP and PID parameters affect a PID computation, the first manipulated
variable of a PID computation may not be the same as the value set in
PA31 PA38
to (event on delay groups 1 to 4, event/delay time)
• On delay can be performed on up to 4 events.
•
• In a code event involving several event outputs, event on delay has to be set separate-
• All processes including event output standby on/off are processed before on delay
• This is shown in the diagram below.
Event output turns off
PA41
(EG1 LED display event number)
The console EG1 LED lights when an event number set in
when it goes off. Note, however, that the EG1 LED is off when
PA42
(EG2 LED display event number)
The console EG2 LED lights when an event number set in
when it goes off. Note, however, that the EG2 LED is off when
PA43
(PID computation initialize)
When SP changes abruptly due to ADV, the derivative action of a PID computation,
may cause an excessive change in the manipulated variable of the computation.
For this reason, the initialization of a PID computation is performed to suppress an
excessive change.
But the initialization of a PID computation means that PID computation continuity is
lost which may affect operating conditions. A
off initialization and determine its conditions.
.
PA31 PA33 PA35
, , and
ly for each output.
processing. When the event output ON condition remains on for longer than the on
delay time, the event output stays on.
The requirement
event turns off The requirement event turns on
On delay time
Chapter 7. PARAMETER SETUP
PA37
determine which events are to be processed.
Event output turns on
PA43
setting allows the user to turn on or
PA17
.
The requirement event turns off
Event output turns off
Time
PA41
goes on and is off
PA41
is set to 0.
PA42
goes on and is off
PA42
is set to 0.
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