Carel ir33+FMC Guía Rápida página 30

ENG
The "Low temperature alarm threshold" AL forces the Fullmotion compressor OFF.
The "High temperature alarm threshold" AH forces the Fullmotion compressor to perform a Pull Down cycle.
See the section on Temperature Pull Down.
The cut ON – cut OFF hysteresis describes the compressor status and is similar to ON/OFF compressor control,
except for the use of parameters cct, AL.
ON
VCC Compressor
Status
OFF
Key
AL = Low temperature threshold
St = Set point
rd = Temperature control differential
Temperature
Compressor status
Key
AH= High temperature alarm threshold
St + rd= Set point + differential
St= Set point
AL= Low temperature alarm threshold
ir33+ wide Fullmotion - +040000055 - rel. 1.0 - 09.06.2014
AL / cct
AH
Cooling capacity / compressor speed modulation
St + rd
St
AL
ON
OFF
Compressor at minimum speed (frequency)
St
rd
Temperature
Fig. 3.b
Compressor ON at MAXIMUM speed
Compressor OFF
Fig. 3.c
10
Time
Time
cct