9
ENG
ir33+ VCC
+040000058 - rel. 1.2 - 15.02.2018
3. IR33+
VCC
FUNCTIONS
3.1
Functions common to all ir33+ VCC models
3.1.1
VCC compressor confi guration
All the parameters used to confi gure the VCC are expressed as frequency (Hz). The corresponding compressor
rotation speed (rpm) is determined based on the following relationship:
Compressor speed (rpm) = Frequency (Hz) * 30
Each model of VCC works between two limit operating frequencies, the switch-off frequency and the
maximum rotation frequency.
ir33+ VCC uses the following default values:
•
switch-off frequency = 30 Hz (thermostat detected signal, but VCC is off , 0 rpm)
•
maximum rotation frequency = 150 Hz (4500 rpm)
For VCCs that use values that are diff erent from these, see the chapter “Advanced VCC confi guration”.
To adapt VCC cooling capacity to the actual needs of the application, set the following parameters:
•
cmf = minimum control frequency;
default value= 52 Hz (1560 rpm)
•
cMf = maximum control frequency;
default value= 100 Hz (3000 rpm)
During normal control, when the conditions require the restart of the VCC, the compressor runs at the soft-start
frequency for a few seconds. To adapt this frequency to the VCC oil recovery specifi cations, set the following
parameter:
•
cSc = soft-start frequency;
default value= 53 Hz (1590 rpm)
During defrosting, if set in hot gas mode, the compressor runs at a fi xed frequency, defi ned by the following
parameter:
•
cdf = frequency for hot gas defrost;
default value= 140 Hz (4200 rpm)
Code Parameter
UOM
Dis.
Def.
Max
Min
cmF Minimum control frequency
Hz
C
52
255
0
cMF Maximum control frequency
Hz
C
100
255
0
cSc
Soft-start frequency
Hz
C
53
255
0
cdF
Frequency for hot gas defrost
Hz
C
140
255
0
Tab. 3.a