1592010880 XWEB3000_5000 EVO OPR GB r1.0 2014.11.28
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Worst case threshold
: allows for the defining of the intervention threshold for the C.R.P. algorithm (in
%)
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Neutral zone
: specifies an oscillation band (centred on the percentage of the worst possible case) inside
which the algorithm does not intervene.
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Initial value
: initial set-point value. The value can be an estimate: in time, the set-point value sent to the
plant will change -according to the algorithm (typically in °C).
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Min. and Max. Set-points
: safety limit values associated with the minimum and maximum suction
pressure: to prevent C.R.O. from excessively increasing or lowering the pressure to avoid the safety
devices from triggering. (typically in °C). It is good for the minimum value to be as high as possible in
order to optimise energy consumption.
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Release and Call Gain
: the call and release gain are two parameters that decide by how much the
current set-point must be increased/decreased. The call-gain parameter is used should the set-point
need to be decreased. It is useful to set a higher call-gain value than the release-gain in order to quickly
decrease the temperature (typically in m°C/%).
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Post Defrost Time out:
the duration after a defrosting event that is ignored in calculating the percentage
(in minutes).
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Simulation Mode:
The enabling of simulation mode does not send the set-point values calculated by the
algorithm
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Cycling Mode:
The enabling of cycling mode, combined with cycle time (in hours) continuously enables
and disables the algorithm. This mode is useful for checking the quality, when applied to the system.
Usually, cycle times of no more than three days are set. When the algorithm is disabled, a reset
command is sent to the plant for its repositioning to its initial state.
Typically, the units of measure of the plant are expressed in °C, however, C.R.O. adapts to the plant's unit of
measure. However, should the unit of measure be modified in the next phase, it will be necessary to re-
configure the CRO starting with the disabling of the set-point variable from the algorithm parameters,
subsequently re-configuring the unit of measure in "Devices Setup" and re-configuring the CRO parameters.
