Satchwell IAC 600, Manual

Page: 8 / 24

CONTROL MODULES
(Cont.)
Integral Action Method
This setting determines the method of control by 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 stage deadzone as the set value
point.
Mode "B" controls using the actual set value.
Integral Action Dumping
The IAC allows the use of integral 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
dropping straight back out of the deadzone again. Therefore, if the
IAC enters its deadzone with Stage 1 in operation, the IAC will hold the
Stage 1 at its current position rather than force the stage to a zero
position. If the controller exits the deadzone back to Stage 1, the
control action will resume at the previous point. If the controller exits
the deadzone in Stage 2, then Stage 1 and its integral time would be
forced to zero before Stage 2 was allowed to run.
The opposite would be true if the controller went into deadzone with
Stage 2 operating.
If the parameter is set to On then the IAC zeros the operational stage
as the controller enters the deadzone. In some systems this may
cause hunting.
Boost Stage
This parameter selects which stage 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 stage should be boosted
to 100% when it enters the first occupied period of each day. The
boost will be held until the set value is reached if Integral Action
Dumping is OFF. Controls to deadzone if Integral Action dumping 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 day.
Yes or No No
Boost (review only)
This parameter shows the influence boost is having on the currently
active stage. As boost overrides the stage fully on. On or Off –
OPTIMISER MODULE
x 2
The optimiser module is self learning with optimum on and off,
selectable linear or BRESTART (logarithmic) optimisation and
histogram display. The optimiser can also be selected for heating or
cooling plant operation.
The module has its own time schedule to set the occupancy times.
Inputs to the module include space sensor, outside sensor(s) and
remote setting. The module outputs are boost on and plant on which
would be connected to the controllers boost and occupied override
inputs respectively.
Main Sensor (review only)
Displays the actual space sensor value. –10,000 to 10,000 –
Actual Setpoint (review only)
This displays the actual setpoint used by the optimiser. –10,000 to 10,000 –
Integral Action Dumping On
The optimiser set point must be equal to the controller set value minus
the appropriate deadzone.
Integral Action Dumping Off
The optimiser set point must equal the controller set value.
NOTE:- If the remote set point input is used then it will set this value
and it will override the "Occupancy Set point".
Remote Setpoint (review only)
This is the actual value on the setpoint input of the optimiser module
and is usually set from an RPW.
–10,000 to 10,000 –
Optimum On Influence
(review only, optional)
This parameter displays the actual amount of time to be added to the
calculated boost time. This value is usually used to supply the
optimiser with an outside influence to take account of low (usually
below 10
°
C) outside temperatures. This value is supplied to the
optimiser through the influence analogue input. If this is an outside
influence it is derived from a look-up table module that is fed by an
outside temperature sensor. This value is subtracted from the
optimum ON time.
–10,000 to 10,000
mins –
Optimum Off Influence (review only, 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