Fullmotion Settings; Set Point Control; Speed Table Configuration - Carel ir33+FMC Guía Rápida

3.1

Set point control

The main physical basis for control is the set point, defined by setting parameter St.
The controller starts working with the soft start frequency set by csc if T> St + rd.
After this soft start, the PID control algorithm manages the correct speed table according to the actual room
temperature.
Frequency
MAX freq.
Start freq.
MIN freq.
Key
St = Set point (target temperature)
rd = Temperature control differential
csc = Soft Start frequency
Whenever the compressor switches ON, the soft start frequency will be set according to parameter csc, as
shown in the graph above. This parameter allows the starting frequency to be changed if the system requires
a fast or slow start up, due to oil or temperature recovery.
Cod. Parameter
St Set point
rd Set point differential
csc Soft Start frequency
cPd Maximum compressor pull down time
AH High temperature alarm threshold
AL Low temperature alarm threshold
3.2

Speed table configuration

The most important configuration in the final applications involves the how find the right speed table.
This can be done using the dedicated parameters cPr; ctI; cdt; cmf; cMf, csc; cct, cdF; cPd to drive a Fullmotion
compressor.
The parameters cPr; ctI; cdf are dedicated to PID control, and define the speed table.
cmf & cMf are the parameters used to limit the speed range of the Embraco system.
The systems starts with a soft start frequency, selectable by parameter csc.
The Fullmotion compressor switches OFF when T< St and the time cct expires.
If cct is set to 0 the compressor switchs OFF immediately when reaching T=St.
If cct is set to 255 the compressor never switches OFF
3.

FULLMOTION SETTINGS

St+rd
csc
Fig. 3.a
9
PID regulation
Temperature
UOM Dis. Type
°C/°F F A
°C/°F F A
Hz C I
Hours C I
°C/°F C F
°C/°F C F
ir33+ wide Fullmotion - +040000055 - rel. 1.0 - 09.06.2014
ENG
Def. Max Min
-20 50 -50
1 0,1 20
53 255 0
1 240 0
-14 200 -50.0
-26 200 -50.0
Tab. 3.a