CONTROL MODULES
Cont.
Integral Action Method
This settin
determines the method of control b
the IAC.
Mode A or B A
Mode "A" controls such that the IAC takes into account the deadzone
and uses the end of the appropriate sta
e deadzone as the set value
point.
Mode "B" controls usin
the actual set value.
Integral Action Dumping
The IAC allows the use of inte
ral action in two different modes.
On or Off Off
If the parameter is set to Off then the IAC holds the current control
level when it enters its deadzone. This is done to avoid the IAC
droppin
strai
ht back out of the deadzone a
ain. Therefore, if the
IAC enters its deadzone with Sta
e 1 in operation, the IAC will hold the
Sta
e 1 at its current position rather than force the sta
e to a zero
position. If the controller exits the deadzone back to Sta
e 1, the
control action will resume at the previous point. If the controller exits
the deadzone in Sta
e 2, then Sta
e 1 and its inte
ral time would be
forced to zero before Sta
e 2 was allowed to run.
The opposite would be true if the controller went into deadzone with
Sta
e 2 operatin
.
If the parameter is set to On then the IAC zeros the operational sta
e
as the controller enters the deadzone. In some s
stems this ma
cause huntin
.
Boost Stage
This parameter selects which sta
e is boosted when the controller is in
a boost condition.
1 or 2 1
Boost in Occupied Period 1
This parameter selects whether the controller sta
e should be boosted
to 100% when it enters the first occupied period of each da
. The
boost will be held until the set value is reached if Inte
ral Action
Dumpin
is OFF. Controls to deadzone if Inte
ral Action dumpin
is
ON.
Yes or No No
Boost in Occupied Period 2
As for Boost is Occupied Period 1 but for the second occupied period
of each da
.
Yes or No No
Boost
review onl
This parameter shows the influence boost is havin
on the currentl
active sta
e. As boost overrides the sta
e full
on.
On or Off –
OPTIMISER MODULE
x 2
The optimiser module is self learnin
with optimum on and off,
selectable linear or BRESTART
lo
arithmic
optimisation and
histo
ram displa
. The optimiser can also be selected for heatin
or
coolin
plant operation.
The module has its own time schedule to set the occupanc
times.
Inputs to the module include space sensor, outside sensor
s
and
remote settin
. The module outputs are boost on and plant on which
would be connected to the controllers boost and occupied override
inputs respectivel
.
Main Sensor
review onl
Displa
s the actual space sensor value.
–10,000 to 10,000 –
Actual Setpoint
review onl
This displa
s the actual setpoint used b
the optimiser.
–10,000 to 10,000 –
Integral Action Dumping On
The optimiser set point must be e
ual to the controller set value minus
the appropriate deadzone.
Integral Action Dumping Off
The optimiser set point must e
ual the controller set value.
NOTE:-
If the remote set point input is used then it will set this value
and it will override the "Occupanc
Set point".
Remote Setpoint
review onl
This is the actual value on the setpoint input of the optimiser module
and is usuall
set from an RPW.
–10,000 to 10,000 –
Optimum On Influence
review onl
, optional
This parameter displa
s the actual amount of time to be added to the
calculated boost time. This value is usuall
used to suppl
the
optimiser with an outside influence to take account of low
usuall
below 10
°
C
outside temperatures. This value is supplied to the
optimiser throu
h the influence analo
ue input. If this is an outside
influence it is derived from a look-up table module that is fed b
an
outside temperature sensor. This value is subtracted from the
optimum ON time.
–10,000 to 10,000
mins
–
Optimum Off Influence
review onl
, optional
As for Optimum On influence but the value is subtracted from the
calculated optimum off time.
–10,000 to 10,000
mins
–
MODULES AND FUNCTIONS
Bubbleland
Symbol Module Range Default
DS 2.951A 8 - 24 05/98
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