12
ENGLISH
EVD
4
+030220227 - rel. 2.1 - 12.06.2008
3.1.2 List of parameters
Below is the list of parameters visible on the EVD4-UI, divided into write and read; the meaning of each
parameter is described in APPENDIX II, while APPENDIX III shows a list of the values of the reference
parameters in relation to certain typical applications.
Key:
= Main parameters required to start operation;
= Secondary parameters required for optimum operation;
— = Advanced parameters.
WRITE
Mode Parameter name Description of the parameter
Mode dependent parameters (Fig. 3.5)
COOL
CH-Superheat set
superheat set point in CH mode
CH-Proportional gain
PID proportional factor in CH mode
CH-Integral time
integral time for superheat control in CH mode
CH-Low Superheat
low superheat value in CH mode
LOP Cool Mode
temperature at minimum operating pressure (MOP) in CH mode
MOP Cool Mode
temperature at maximum operating pressure (MOP) in CH mode
HEAT
HP-Superheat set
superheat set point in HP mode
HP-Proportional gain
PID proportional factor in HP mode
HP-Integral time
integral time for superheat control in HP mode
HP-Low Superheat
low superheat value in HP mode
LOP Heat Mode
temperature at minimum operating pressure (LOP) in HP mode
MOP Heat Mode
temperature at maximum operating pressure (MOP) in HP mode
DEFROST
DF-Superheat set
superheat set point in DF mode
DF-Proportional gain
PID proportional factor in DF mode
DF-Integral time
integral time for superheat control in DF mode
DF-Low Superheat
low superheat value in DF mode
LOP Defr. Mode
temperature at minimum operating pressure (LOP) in DF mode
MOP Defr. Mode
temperature at maximum operating pressure (MOP) in DF mode
COMMON
Circuit/EEV ratio
percentage of the maximum capacity managed by the valve in the circuit where it is installed
Dynamic proportional gain
attenuation coeffi cient with change in capacity
—
SHeat dead zone
dead zone for PID control —
Derivative time
PID derivative time
—
Low SHeat int. time
integral time for low superheat control —
LOP integral time
integral time for low evaporation pressure (LOP) control —
MOP integral time
integral time for high evaporation pressure (MOP) control —
Hi TCond. int. time
integral time for high condensing pressure control (HiTcond) —
Hi TCond. protection
maximum condensing temperature —
Alarms delay Low SH
low superheat alarm delay —
Alarms delay LOP
low evaporation pressure (LOP) alarm delay —
Alarms delay MOP
high evaporation pressure (MOP) alarm delay —
MOP startup delay
MOP delay time —
Alarms delay probe error
probe error alarm delay —
Global parameters (Fig. 3.5)
MODE
READ ONLY, received from µC
2
—
REGULATION
READ ONLY, received from µC
2
—
Refrigerant
number indicating the type of refrigerant used
l
EVD probes type
number indicating the combination of sensors used to calculate the superheat —
Valve type
number that defi nes the type of electronic valve used
l
EEV mode man.
enable/disable manual valve positioning —
Requested steps
required motor position in manual control
—
Open relay low SH
enable/disable relay opening following low superheat
—
Open relay MOP
enable/disable relay opening following MOP
—
Valve alarm enable/disable valve alarm (valve not closed at shutdown alarm) o
S1 probe limits Min value
‘zero’ scale for pressure sensor on input S1
l
S1 probe limits Max value
end scale for pressure sensor on input S1
l
S2-Pt1000 calib.
calibration index for PT1000 sensor
—
Probes offset S1
correction of the lower limit of S1 —
Probes offset S2
correction of the lower limit of S2 —
Probes offset S3
correction of the lower limit of S3 —
Enable reset to dafault
enable restore default parameters —
Reset to default
confi rm enable default parameters —
Standby steps
number of valve standby steps —
Blocked valve check
time after which, in certain conditions, the valve is considered as being blocked
—
Go ahead
enable restart following error
—
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