APPENDICE II. DESCRIZIONE PARAMETRI 28
IV.V L’azione derivata
Kd IN DEFINITIVA
Aumentando il valore del tempo dell’azione derivata Kp, diminuiscono le oscillazioni ma possono sorgere vibrazioni attorno al set point.
L’azione derivata fa dipendere il controllo dal “futuro” dell’errore, cioè dalla direzione in cui esso si muove e dalla velocità con cui varia. Infatti, l’azione derivata calcola una stima dell’errore che si compierà dopo t secondi sull’andamento della curva all’istante t (fi gura seguente) e fa così dipendere il controllo da una sorta di predizione dell’errore Td istanti di tempo in avanti.
L’azione derivativa “cerca di capire da che parte e con che velocità va l’errore” e di reagire di conseguenza, il parametro Td dà la misura di quanto lontano nel futuro si spinge la predizione.
L’azione derivativa è la più pronta a reagire (anche ai rumori di misura, purtroppo) e aiuta solo se la predizione è buona, ossia se Td non è troppo grande rispetto alle dinamiche temporali dell’errore: la differenza si nota osservando i casi A e B in Fig. 6
L’azione derivativa è idealmente nulla a regime, ove in realtà però segue e tende ad amplifi care il rumore di misura; aiuta pertanto solo nelle fasi iniziali dei transitori. Può essere di grande aiuto ma è anche pericolosa, soprattutto se la misura della variabile controllata è rumorosa.
Legenda A azione integrale B azione proporzionale C Ti tempo dell’azione integrale
User manual
We wish to save you time and money!
We can assure you that the thorough reading of this manual will guarantee correct installation and safe use of the product described.
INFORMATION FOR USERS ON THE CORRECT HANDLING OF WASTE ELECTRICAL AND ELECTRONIC EQUIPMENT (WEEE)
In reference to European Community directive 2002/96/EC issued on 27 January 2003 and the related national legislation, please note that:
1. WEEE cannot be disposed of as municipal waste and such waste must be collected and disposed of separately;
2. the public or private waste collection systems defi ned by local legislation must be used. In addition, the equipment can be returned to the distributor at the end of its working life when buying new equipment.
3. the equipment may contain hazardous substances: the improper use or incorrect disposal of such may have negative effects on human health and on the environment;
4. the symbol (crossed-out wheeled bin) shown on the product or on the packaging and on the instruction sheet indicates that the equipment has been introduced onto the market after 13 August 2005 and that it must be disposed of separately;
5. in the event of illegal disposal of electrical and electronic waste, the penalties are specifi ed by local waste disposal legislation.
IMPORTANT WARNINGS
CAREL bases the development of its products on several years’ experience in the HVAC fi eld, on continuous investment in technological innovation of the product, on rigorous quality procedures and processes with in-circuit and function tests on 100% of its production, on the most innovative production technologies available on the market. CAREL and its branch offi ces/affi liates do not guarantee, in any case, that all the aspects of the product and the software included in the product will respond to the demands of the fi nal application, even if the product is built according to state-of-the-art techniques.
The client (builder, developer or installer of the fi nal equipment) assumes every responsibility and risk relating to the confi guration of the product in order to reach the expected results in relation to the specifi c fi nal installation and/or equipment. CAREL in this case, through specifi c agreements, can intervene as consultant for the positive result of the fi nal start-up machine/application, but in no case can it be held responsible for the positive working of the fi nal equipment/apparatus.
The CAREL product is a state-of-the-art product, whose operation is specifi ed in the technical documentation supplied with the product or can be downloaded, even prior to purchase, from the website www . carel . com.
Each CAREL product, in relation to its advanced technological level, needs a phase of defi nition/
confi guration / programming / commissioning so that it can function at its best for the specifi c application. The lack of such phase of study, as indicated in the manual, can cause the fi nal product to malfunction of which CAREL can not be held responsible.
Only qualifi ed personnel can install or carry out technical assistance interventions on the product.
The fi nal client must use the product only in the manner described in the documentation related to the product itself.
Without excluding proper compliance with further warnings present in the manual, it is stressed that in any case it is necessary, for each Product of CAREL:
• To avoid getting the electrical circuits wet. Rain, humidity and all types of liquids or condensation contain corrosive mineral substances that can damage the electrical circuits. In any case, the product should be used and stored in environments that respect the range of temperature and humidity specifi ed in the manual.
• Do not install the device in a particularly hot environment. Temperatures that are too high can shorten the duration of the electronic devices, damaging them and distorting or melting the parts in plastic. In any case, the product should be used and stored in environments that respect the range of temperature and humidity specifi ed in the manual.
• Do not try to open the device in any way different than that indicated in the manual.
• Do not drop, hit or shake the device, because the internal circuits and mechanisms could suffer irreparable damage.
• Do not use corrosive chemical products, aggressive solvents or detergents to clean the device.
• Do not use the product in application environments different than those specifi ed in the technical manual.
All the above reported suggestions are valid also for the control, serial unit, programming key or never- theless for any other accessory in the product portfolio of CAREL. CAREL adopts a policy of continuous development. Therefore, CAREL reserves the right to carry out modifi cations and improvements on any product described in the present document without prior notice. The technical data in the manual can undergo modifi cations without obligation to notice. The liability of CAREL in relation to its own product is regulated by CAREL’s general contract conditions edited on the website www . carel . com and/or by specifi c agreements with clients; in particular, within the criteria consented by the applicable norm, in no way will CAREL, its employees or its branch offi ces/affi liates be responsible for possible lack of earnings or sales, loss of data and information, cost of substitute goods or services, damage to things or persons, work interruptions, or possible direct, indirect, incidental, patrimonial, of coverage, punitive, special or consequential in any way caused damages, be they contractual, out-of-contract, or due to negligence or other responsibility originating from the installation, use or inability of use of the product, even if CAREL or its branch offi ces/affi liates have been warned of the possibility of damage.
Content
1. INTRODUCTION 7
1.1 Codes and accessories ...7 1.2 Connecting to the main serial port ...8 1.3 Operation of the service serial port ...8 1.4 Setting the network address ...8 1.5 Control functions ...8
2. INPUTS AND OUTPUTS 9
2.1 Power supply, sensors, digital I/O ...9 2.2 Main serial port ...9 2.3 Stepper motorr ...9 2.4 Relay ...10 2.5 Service serial port ...10 3.1 Application with µC2 (EVD000040* and EVD000043*) via tLAN ...11
3. EVD
4APPLICATIONS: CONNECTIONS, LIST OF PARAMETERS
AND OPERATING MODE S 11
3.2 Application with pCO (EVD000040* and EVD000043*) via tLAN ...14 3.3 Application as positioner (EVD000040* and EVD000043*) ...17 3.4 Application with pCO (EVD000041* and EVD000044*) via pLAN ...19 3.5 Application with supervisor (EVD000042* and EVD000045*) via RS485 ...22
4. TECHNICAL AND CONSTRUCTIONAL SPECIFICATIONS 24
5. TROUBLESHOOTING 25
APPENDIX I. INSTALLING AND USING THE EVD4-UI PROGRAM 26
I.I Installation ...26 I.II Preparing the connections...26 I.III Preparing the user interface ...26 I.IV Saving the data ...26 I.V Loading the data ...27 I.VI Modifying the parameters ...27 I.VII Confi gurations available ...27
APPENDIX II. DESCRIPTION OF THE PARAMETERS 28
APPENDIX III. PARAMETER SETTINGS 34
APPENDIX IV. SUMMARY OF PID CONTROL 35
IV.I Symbols used ...35 IV.II Pid control law ...35 IV.III Proportional action ...35 IV.IV Integral action ...36 IV.V Derivative action...37
EVD4 +030220225 - rel. 1.0 - 21.03.2006
ENGL ISH
1. INTRODUCTION
EVD4 is an evolved PID controller complete with driver for stepper motors specially designed for the ma- nagement of electronic expansion valves in refrigerant circuits. It features sophisticated control functions and can be used in many operating confi gurations in refrigeration and air-conditioning systems, such as:
- PID control of superheat with protection and safety compensation functions;
- PID control on one measurement (pressure or temperature);
- positioner for electronic expansion valves controlled by 4 to 20 mA or 0 to 10 Volt signal.
The device is confi gured and the address set via serial interface and the user interface software is stored in non-volatile memory.
1.1 Codes and accessories
Code Description
EVD000040* Controller with tLAN serial already confi gured for operation with µC2 and µC2 SE (address 2) universal for EEV1 valves EVD000041* Controller with RS485 serial already confi gured for operation with pCO in pLAN (address 30) universal for EEV1 valves EVD000042* Controller with RS485 serial already confi gured for operation with supervisor (address 250) universal for EEV1 valves EVD000043* Controller with tLAN serial already confi gured for operation with µChiller (address 2) for CAREL valves
EVD000044* Controller with RS485 serial already confi gured for operation with pCO via pLAN (address 30) for CAREL valves EVD000045* Controller with RS485 serial already confi gured for operation with supervisor (address 250) for CAREL valves EVD00004*1 Multiple packages of 10 pcs, without connectors
EVBAT00200 Battery charger module and step-up transformer for backup power supply EVBAT00300 System made up of EVBAT00200 + 12 V 1.2 Ah battery + cable and connectors EVBATBOX10 Metal battery case
CVSTDUTTL0 USB converter to connect a PC to the service serial port CVSTD0TTL0 RS232 converter to connect a PC to the service serial port
EVDCAB0500 Package of 14 cables with terminals for MINIFIT connector, length 5 m, cross-section 1 mm2 EVDCON0001 Packaging of connectors for 10 EVD4 for multiple packages of 10 pcs
(1): See the table on the corresponding instruction sheet or APPENDIX II “DESCRIPTION OF THE PARAMETERS”, “valve type” parameter
(2): For the other types of probes, see Chap. 4 “Technical and constructional characteristics”
RT–
RT+
GNX NO COM
GVba t DI1 S4 V S3 S2S1 G0 GND DI2S4 I Vr1Vr2OC
3 4
1 2
NTC: low temperature probes CVSTDUTTL0: converter
E2V*: CAREL electronic expansion valve
EVDCON0001:
10 connector kits solenoid
valve
alarm signal
EVDCON0001:
10 connector kits personal computer for configuration
0 to 10 V
Probe1 Signal4
SPKT: 0 to 5 V ratiometric probes
External controller
Probes(2)
Important
Probe3 4 to 20 mA
1
digital input
EVBAT00200 EVBAT00300 battery modules
MC2*: µC2 controller
PlantVisor for configuration
PCO*: programmable controllers
PCO*: programmable controllers S
GD1user interface GD1user interface
RS485
voltage-free relay output for utilities up to 230 Vac NB: DANFOSS, SPORLAN and
ALCO electronic expansion valves can be connected
EVDCAB0500:
14 pre-crimped cables
EVD*40* and EVD*43*:
tLAN version EVD*41* and EVD*44*:
pLAN version EVD*42* and EVD*45*:
RS485 version
EVD4
PC
EVD4 service USB adapter
EEV driver4
Fig. 1.1
EVD4 +030220225 - rel. 1.0 - 21.03.2006
GD1user interface
EV driver
E2V
T P
GD1user interface
EV driver
E2V
T P
EV driver
E2V
T P
Master control Supervisor
Fig. 1.1
Fig. 1.2
Fig. 1.3
ENGL ISH
1.2 Connecting to the main serial port
EVD4 can operate independently (stand alone), connected to a supervisor to control the fundamental parameters, or connected to the LAN with other CAREL controllers, according to the following diagrams:
1.2.1 TLAN connection with µC2 or µC2 SE or pCO (codes EVD000040* and EVD000043*)
Fig. 1.1.
1.2.2 pLAN connection with pCO (codes EVD000041* and EVD000044*) Fig. 1.2.
1.2.3 Stand alone in the RS485 network with supervisor (codes EVD000042* and EVD000045*)
Fig. 1.3.
1.3 Operation of the service serial port
The service serial port (par. 2.5) is used to access all the EVD4 parameters even when the instrument is already installed and operating; to do this, the special converter is required (CVSTDUTTL0 or CVSTD0TTL0), plus a PC with USB or RS232 serial port. “APPENDIX I - Installing and using the EVD4-UI program” describes the installation and operation of the EVD4_UI software that is used to confi gure the controller.
The converter can power the logical section of the EVD4 (but not the expansion valve), and therefore this can be confi gured from the PC without having to connect the instrument to the 24 Vac power supply.
1.4 Setting the network address
The EVD4 operating parameters, including the network address, reside on the EEPROM; to modify the values, access the service serial port using the EVD4-UI software: connect the special converter (CVSTDUT- TL0 or CVSTD0TTL0) to the service serial port (Fig. 2.8) and a PC with USB or RS232 serial port, then start the “EVD4_U Key” connection, as described in “APPENDIX I - Installing and using the EVD4-UI Address”
and set the Net address parameter; in the box at the top right of the interface, the “Network address” item will show the new value of the address. If not changed by the user, the Net address parameter will have the following default values:
Net address EVD000040* and EVD000043*
EVD000041* and EVD000044*
EVD000042* and EVD000045*
1.5 Control functions
EVD4 can operate in different modes:
• PID superheat control with protection and safety compensation functions
• PID control based on one measurement (pressure, temperature)
• Positioner for EEV valves controlled by a 4 to 20 mA or 0 to 10 Volt signal
EVD4 +030220225 - rel. 1.0 - 21.03.2006
MOLEX® Mini-Fit 538-39-01-2140
G Vbat DI1 S4V S3 S2 S1 G0 GND DI2 S4I Vr1 Vr2 OC
Fig. 2.1
2 1
4 3
MOLEX
®MiniFit 538-39-01-2060
Fig. 2.4
GN X RT+ RT -
PHOENIX® MC1,5/3-ST-3,81
Fig. 2.3
ENGL ISH
Below is a description of the connectors supplied with the EVD00004*0 or purchased in separate packages (EVD400CON0 for the EVD00004*1). The drawings represent the connectors as seen after having been fi tted on the EVD4.
2.1 Power supply, sensors, digital I/O
The main 14-pin MINIFIT® connector is used to connect the main and auxiliary power supply (if the EVBAT00200/300 module is fi tted), as well as the sensors, digital inputs and transistor output.
This connector accepts wires with cross-section up to 1 mm2 with MOLEX® 5556-T barrel.
A kit of pre-crimped 14 x 1 mm2 cables, length 5 m, is available for purchase (EVDCAB0500).
line Function
G, G0 24 Vac power supply
GND Earth for all signals, in electrical contact with GND and the GNX terminal on the main serial connector
Vbat Emergency power supply generated by the EVBAT00200 module
DI1, DI2 Digital inputs to be activated by voltage-free contact or transistor to GND, 5 V no-load and 5 mA short-circuited
Vr1, Vr2 5 V references used as power supply to the ratiometric probes S1 Analogue input for ratiometric probe or NTC low temperature probe S2 Analogue input for ratiometric probe, NTC high temperature probe or Pt1000 S3 Analogue input for ratiometric probe or NTC low temperature probe S4I Analogue input for 4 to 20 mA signal
S4V Analogue input for 0 to 10 Volt signal
OC Open-collector transistor output, for up to 100 mA
Table 2.1 For the power supply in particular, observe the diagram shown:
2.2 Main serial port
Removable terminal for connection to the MASTER unit (µChiller, pCO) or the supervisor (PlantVisor).
line Function
GNX Signal earth, in electrical contact with GND on the I/O connector
RT+ + signal for the RS485 connection (pLAN, supervisor) or DATA signal for the tLAN connection RT– v signal for the RS485 connection (pLAN, supervisor)
Table 2.2
2.3 Stepper motorr
6-pin MINIFIT® connector. Accepts cables up to 1 mm2 with MOLEX® 5556-T barrel.
Line Function
GND Earth electrically connected to GND on the I/O connector, and with the earth connector on the electrical panel
1 + Phase A
2 + Phase B
3 – Phase A
4 – Phase B
Table 2.3
2. INPUTS AND OUTPUTS
G Vbat DI1 S4V S3 S2 S1 G0 GND DI2 S4I Vr1 Vr2 OC
EVD4
G B- B+
G0 OUT GND
4 A T
power supply module EVD
12 V 1,2 Ah 0,8 A T
0,8 A T
24 Vac 230 Vac
optional backup EVBAT00200/300
do not connect if EVBAT* is fitted
Fig. 2.2
EVD4 +030220225 - rel. 1.0 - 21.03.2006
NO CO M
relay
PHOENIX® GMSTB 2,5/2 ST Fig. 2.6
Sporlan SEI SEH
CAREL
&
ALCO
DANFOSS ETS
ALCO EX5/6 Green
Black Red White
Green Yellow Brown White
Green White Red Black
2 1
4 3
1 2 3 4
Blue White Brown Black
Fig. 2.7
USB
convertitore
CVSTDUTTL0 A
GNX RT+ RT-
B
Fig. 2.8
Fig. 2.5
ENGL ISH
2.4 Relay
Plug-in terminal line Function
COM Common
NO Normally open contact, 5 A 250 Vac resistive load; 2 A 250 Vac, inductive load (PF= 0.4)
2.5 Service serial port
Allows access to the functions of the EVD4; via PC. To access this connector:
1) Remove the cover by levering it with a screwdriver on the central notch (Fig. 2.7).
2) Locate the white 4-pin connector and insert the special converter cable (Fig. 2.8).
Connect the USB cable to the PC; if the EVD4 is not powered by the 24 Vac line, it will take its power supply from the serial converter.
Once the supervisor has been connected, start an application with the supervisor protocol at 4800 baud on network address 1, for example via EVD4_UI (see APPENDIX I).
This serial port can be connected and disconnected without needing to remove the USB cable from the PC.
EVD4 +030220225 - rel. 1.0 - 21.03.2006
Fig. 3.1
GN X RT+ RT -
PHOENIX® MC1,5/3-ST-3,81
USB
convertitore
CVSTDUTTL0 A
GNX RT+ RT-
B
Fig. 3.2
G G0
G Vbat DI1 S4V S3 S2 S1 G0 GND DI2 S4I Vr1 Vr2 OC
EVD4
0,8 A T
24 Vac
µC2
230 Vac
Fig. 3.3
Sporlan SEI SEH
CAREL
&
ALCO
DANFOSS ETS
ALCO EX5/6 Green
Black Red White
Green Yellow Brown White
Green White Red Black
2 1
4 3
1 2 3 4
Blue White Brown Black
Fig. 3.4
ENGL ISH
Below is a description of the connections, confi guration parameters, UI graphics and operating modes of the six codes available for the EVD4 in the different applications.
3.1 Application with µC
2(EVD000040* and EVD000043*) via tLAN
3.1.1 Connections
Communication: with reference to Fig. 3.1, connect GNX and RT+ to the µC2 unit.
Confi guration: the EVD4-UI software is used to access the parameters; connect the converter (CVSTDUTTL0 or CVSTD0TTL0) to the service serial port (Fig. 3.2).
Power supply: with reference to Fig. 3.3, connect G and G0 to the 24 Vac power supply side; to connect an auxiliary battery see the EVD4 Instruction Sheet.
Valve: with reference to Fig. 3.4, connect the valve according to the type set for the “Valve
type” parameter.
Probes: Connect the ratiometric pressure sensors and NTC temperature sensors to S1 and S3 respectively.
For other types of probes or connections, change the value of the “EVD probes type”
parameter and see chap. 4
WARNING: if a EVD4 unit is erroneously connected to a controller with a different communication protocol (e.g. EVD000040* with pCO via pLAN) and is then connected to a unit with the same protocol (e.g. EVD000040* with pCO or µC2 via tLAN), the fi rst time that the EVD4 is connected with the correct protocol it may take a few minutes to recognise the protocol; if this waiting time seems excessive, disconnect power to the controller and the EVD4 (including any connections via CVSTDUTTL0 or CVSTD0TTL0 converter), and then reconnect the devices (including any connection via CVSTDUTTL0 or CVSTD0TTL0 converter) and wait a few minutes for the connection to be restored independently. In the event of connection to µC2, after having reconnected the devices to the power supply, connect the EVD4 to a PC and activate the EVD4_UI using the “EVD4_UI MCH2”
connection, set En. reset to default = 14797, then Reset to default = Yes (the box changes from green to red).
3. EVD
4APPLICATIONS: CONNECTIONS, LIST OF PARAMETERS AND OPERATING MODE S
G Vbat DI1 S4V S3 S2 S1 G0 GND DI2 S4I Vr1 Vr2 OC
NTC -50T105 °C
S3
NTC*WF*
Temp.
GND
ratiometric + OUT Vr1
SPKT*R*
Press.
GND
P S1
Key:
A Service serial port B Main serial port