Carel EVD4 - Application with Modbus Protocoll (EVD0001460) Via RS485

24
ENGLISH
EVD
4
+030220227 - rel. 2.1 - 12.06.2008
Fig. 3.26
3.6 Application with Modbus® protocoll (EVD0001460) via RS485
3.6.1 Connections
Communication: connect GNX, RT+ and RT- to the corresponding ends of the RS485 serial interface
connected to the pCO controller (see the pCO sistema manual) (Fig 3.22).
Confi guration: Connect the converter (CVSTDUTTL0 or CVSTD0TTL0) to the service serial port
and to a PC with USB or RS232 serial port (Fig. 3.18).
Power supply: connect G and G0 to the 24 Vac power supply (Fig 3.19)
Valve: connect the valve according to the type set for the “Valve type” parameter (Fig. 3.20).
Probes: Connect the ratiometric pressure sensors and NTC temperature sensors to S1 and S3
respectively.
Sporlan
SEI
SEH
CAREL
DANFOSS
ETS
ALCO
EX5/6
2
1
4
3
1
2
3
4
Green
Black
Red
White
Green
Yellow
Brown
White
Green
White
Red
Black
Blue
White
Brown
Black
for code:
EVD00004**
Sporlan
SEI
SEH
CAREL
DANFOSS
ETS
ALCO
EX5/6
2
1
4
3
3
4
1
2
Green
Yellow
Brown
White
Green
Black
Red
White
Green
White
Red
Black
Blue
White
Brown
Black
for code:
EVD00014**
3.5.2 List of parameters
Below is the list of parameters visible from the EVD4-UI, divided into write and read; the meaning of each is
detailed in APPENDIX II, while APPENDIX III shows a list of the values of the reference parameters in relation to
certain applications. Key: = Main parameters required to start operation; = Secondary parameters required
for optimum operation; — = Advanced parameters.
WRITE
Mode Parameter name Parameter description
Mode dependent parameters (Fig. 3.21)
Main
Circuit/EEV ratio
percentage of the maximum capacity managed by the valve 
CH-Superheat set
superheat set point 
CH-Prop. gain
PID proportional factor 
CH-Integral time
integral time for superheat control 
Advanced I
SH dead zone
dead zone for PID control —
Derivative time
PID derivative time 
CH-Low Superheat
low superheat value 
LOP Cool Mode
temperature at minimum operating pressure (LOP) in CH mode 
MOP Cool Mode
temperature at maximum operating pressure (MOP) in CH mode 
Low SH 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 —
Alarms del. Low SH
low superheat alarm delay —
Alarms del. LOP
low evaporation pressure (LOP) alarm delay —
Alarms del. MOP
high evaporation pressure (MOP) alarm delay —
MOP startup delay
MOP delay time when starting control —
Advanced II
EEV mode man.
enable/disable manual valve positioning —
Requested steps
required motor position in manual control —
BlockedValve check
time after which the valve is considered as being blocked —
EVD probes type
type of sensors used —
S2-Pt1000 calib.
calibration index for PT1000 sensor —
Probes offset S1
correction of S1 —
Probes offset S2
correction of S2 —
Probes offset S3
correction of the lower limit of S3 —
Al. delay probe err.
probe error alarm delay —
Open relais low SH
enable/disable relay opening following low superheat —
Open relais MOP
enable/disable relay opening following MOP —
Valve alarm
enable/disable valve alarm 
System
Minimum steps
minimum control steps —
Maximum steps
maximum control steps —
Closing steps
steps completed in total closing —
Standby steps
number of valve standby steps —
Steprate
motor speed —
Phase current
peak current per phase —
Still current
current with the motor off —
Duty cycle
motor duty cycle —
Global parameters (Fig. 3.21)
Refrigerant
number indicating the type of refrigerant used

Valve type
number that defi nes the type of electronic valve used

S1 probe limitsMin barg
‘zero’ scale for pressure sensor on input S1

S1 probe limitsMax barg
end scale for pressure sensor on input S1

Stand alone
enable StandAlone

Go ahead enable restart following error 
GNX RT+ RT-
PHOENIX
®
MC1,5/3-ST-3,81
Supervisor
(RS485)
Fig. 3.22
G Vbat DI1 S4V S3 S2 S1
G0 GND DI2 S4I Vr1 Vr2 OC
NTC -50T105 °C
S3
Temperature
NTC*WF*
Digital input
DI1
GND
GNDDI1
ratiometric +
OUT
Vr1
Ratiometric
pressure SPKT*R*
GND
P
S1
For other types of probes or connections, change the value of
the “EVD probes type” parameter and see technical leafl et.
Fig. 3.23
USB
convertitore /
converter
CVSTDUTTL0
A
GNX RT+ RT-
B
Key:
A Service serial port
B Main serial port
Fig. 3.24
G
G0
G Vbat DI1 S4V S3 S2 S1
G0 GND DI2 S4I Vr1 Vr2 OC
EVD
4
0,8 A T
24 Vac
µC
2
230 Vac
Fig. 3.25