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H i g h E f f i c i e n c y S o l u t i o n s

EVD mini

NO POWER

& SIGNAL

CABLES

TOGETHER

READ CAREFULLY IN THE TEXT!

User manual

Superheat control for unipolar electronic
expansion valve

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Summary of Contents for EVD mini

Page 1: ...H i g h E f f i c i e n c y S o l u t i o n s EVD mini NO POWER SIGNAL CABLES TOGETHER READ CAREFULLY IN THE TEXT User manual Superheat control for unipolar electronic expansion valve ...

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Page 3: ...ot use corrosive chemicals solvents or aggressive detergents to clean the device do not use the product for applications other than those speciﬁed in the technical manual All of the above suggestions likewise apply to the controllers serial boards programming keys or any other accessory in the CAREL product portfolio CAREL adopts a policy of continual development Consequently CAREL reserves the ri...

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Page 5: ...al functions 17 5 5 Regolazione speciale smooth lines 17 5 6 Control parameters for protection functions 18 5 7 Service parameters 18 6 PROTECTORS 19 6 1 Protectors 19 7 PARAMETERS TABLE 21 8 NETWORK CONNECTION 23 8 1 RS485 serial conﬁguration 23 8 2 Network connection for commissioning via PC 23 8 3 Visual parameter manager 23 8 4 Restore default parameters 24 8 5 Setup by direct copy 24 8 6 Setu...

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Page 7: ...trol via digital input or remote control via serial connection controller and valve power supply incorporated 230 V 115 V RS485 serial communication incorporated Modbus protocol IP65 operating conditions 25T60C 13T140 F compatible with Carel E2V and E3V single pole valves From software revision 1 6 and higher new functions have been introduced hot gas bypass by pressure hot gas bypass by temperatu...

Page 8: ...STALLATION 2 1 Dimensions and mounting mm in Mounting on DIN rail with screws EVD mini 24 V YES YES EVD mini 230 V YES NO EVD mini 24 V Fig 2 a EVD mini 230 V Fig 2 b On DIN rail mounting 1 Fasten the DIN rail and ﬁt the controller from point A 2 24V model use a screwdriver to remove the two side slots before installing any other controllers alongside EVD mini 24 V Fig 2 c EVD mini 230 V Fig 2 d S...

Page 9: ...olar valve ENG EVD mini 0300036EN rel 1 2 23 04 2018 2 2 Description of the terminals EVD mini 24 V EVD mini 230 V Fig 2 f Fig 2 a Key Ref Terminal Description Ref Terminal Description A ExV Single pole valve connection H2 24 Vdc power supply G Power supply 24 Vdc B 13 V in Ultracap module connection accessory G0 Power supply 0 Vdc 13 V out DI Digital input to enable control GND H3 230 V power sup...

Page 10: ...connect the valve cable it is recommended to use a maximum cable length of 1 m for E2V and E3V valves 4 the 24 V models can be powered at 24Vac use a class II safety transformer adequately protected against short circuits and overload Transformer power must be between 20 and 50 VA as shown in the technical speciﬁcations table 24 Vdc use an external power supply the see technical speciﬁcations tabl...

Page 11: ...in the panel if this supplies diﬀerent devices such as contactors solenoid valves etc which will require a separate transformer EVD mini ice is a controller to be incorporated into the ﬁnal equipment it must not be wall mounted DIN VDE 0100 protective separation must be guaranteed between the SELV circuits Safety Extra Low Voltage and the other circuits The requirements of DIN VDE 0100 must be com...

Page 12: ...es greater than 99 are displayed in two steps ﬁrst the hundreds followed by H then the tens and units 3 values less than 9 are displayed in two steps ﬁrst the sign then the tens and units GASType Mode Super Heat GASType Mode Super Heat 123 GASType Mode Super Heat GASType Mode Super Heat 99 Fig 3 c 3 3 Programming mode The parameters can be modiﬁed using the front keypad Access depends on the user ...

Page 13: ... the display 1 Refrigerant default 3 R404A 2 Type of control default 1 multiplexed showcase cold room 3 Superheat set point default 11 K Procedure GASType Mode Super Heat 1 The display shows the bar at the top refrigerant GAS Type GASType Mode Super Heat 2 Press PRG Set to display the refrigerant setting GASType Mode Super Heat 3 Press UP DOWN to modify the value GASType Mode Super Heat 4 Press PR...

Page 14: ... selectable for the GAS Type refrigerant parameter 1 set any refrigerant e g R404 2 select the type of main control the superheat set point and complete the initial commissioning procedure 3 use the VPM program Visual Parameter Manager see the chapter Network connection and set the type of refrigerant 0 custom and the Dew point a f high low parameters that deﬁne the refrigerant 4 start control for...

Page 15: ...shold Integra tion time 1 Multiplexed cabinet cold room 15 150 11 5 15 50 0 50 20 2 Air conditioner chiller with plate heat exchanger 3 40 6 2 2 5 50 4 50 10 3 Air conditioner chiller with tube bundle heat exchanger 5 60 6 2 2 5 50 4 50 10 4 Air conditioner chiller with ﬁnned coil heat exchanger 10 100 6 2 10 50 10 50 20 5 Analogue positioner 0 to 10 V 6 Superheat control with 2 temperature probes...

Page 16: ... point 11 20 LowSH threshold 55 99 K F CP PID proport gain 15 0 800 ti PID integral time 150 0 999 s Note when selecting the type of Mode the PID control values suggested by CAREL will be automatically set for each application Control parameters for protection functions See chapter on Protectors 5 2 Analogue positioner 0 10 Vdc The valve will be positioned linearly depending on the value of the 0 ...

Page 17: ...ee the General connection diagram This is PID without any protection LowSH LOP MOP see the chapter on Protectors no valve unblock procedure and no auxiliary control functions The function uses the hot gas bypass temperature probe read by input S2 compared against the Hot gas bypass temperature set point Control is reverse as the temperature increases the valve closes and vice versa Par Description...

Page 18: ...rk connection Unit of measure par Si The unit of measure used by the driver can be selected S I C K barg Imperial F psig Par Description Def Min Max UOM Si Unit of measure 1 C K barg 2 F psig 1 1 2 Note lthe unit of measure K or F relates to degrees Kelvin or Fahrenheit adopted for measuring the superheat and the related parameters When changing the unit of measure all the values of the parameters...

Page 19: ...alls below the threshold the system enters low superheat status and the intensity with which the valve is closed is increased themorethesuperheatfallsbelowthethreshold themoreintenselythevalve will close The LowSH threshold must be less than or equal to the superheat set point The low superheat integration time indicates the intensity of the action the lower the value the more intense the action T...

Page 20: ...the threshold until the load conditions change Par Description Def Min Max U M C5 MOP protection threshold 50 122 Protection LOP threshold 200 392 C F C6 MOP protection integration time 20 0 800 s The integration time is set automatically based on the type of main control When the evaporation temperature rises above the MOP threshold the system enters MOP status superheat control is interrupted to...

Page 21: ...ass pressure set point 3 20 290 200 2900 barg psig A 23 22 R W _t Hot gas bypass temperature set point 10 85 121 200 392 C F A 22 21 R W SERVICE P1 Probe S1 reading 85 290 200 2900 barg psig A 6 5 R P2 Probe S2 reading 85 121 200 392 C F V A 7 6 R tE Evaporation temperature converted 85 121 200 392 C F A 4 3 R tS Suction temperature 85 121 200 392 C F A 3 2 R Po Valve opening 0 100 A 1 0 R CP PID ...

Page 22: ...parity odd 8 19200 2 stop bit parity even 17 19200 1 stop bit parity odd 2 0 17 I 20 147 R W Si Unit of measure 1 C K barg 2 F psig 1 1 2 I 16 143 R W IA Enable operating mode modiﬁcation 0 1 yes no 0 0 1 I 15 142 R W U1 Enable manual valve positioning 0 1 no yes 0 0 1 D 11 10 R W U2 Manual valve position 0 0 999 step I 7 134 R W U3 Valve control steps 1 2 480 960 steps 1 1 2 I 11 138 R W U4 Valve...

Page 23: ...atibility a shielded cable suitable for RS485 data transmission is used The RS485 converter is used to connect a computer running the VPM software to the EVD mini driver via a serial network for commissioning the controllers The system allows a maximum of 99 units with a maximum network length of 500 m Connection requires the standard accessories RS485 USB converter CAREL P N CVSTDUMOR0 and a 120 ...

Page 24: ...d a list of project parameters hex modify and save a new project Setup summary Display the default values for the current list of parameters Prepare custom setup See online help Update device Select list of parameters and then Upload to controller Upload ﬁrmware Select ﬁrmware and Upload Synoptic and graphs Overview with position of probes and probe and superheat readings in real time Tab 8 b 8 4 ...

Page 25: ...on page parameters p_GAS_TYPE refrigerant and p_SUPER_MAIN_REGULATION type of control b on the Conﬁguration page parameter p_SH_SET Fig 8 m 3 Save the list of parameters with a new name for example NEW_ NAME hex To load and display a list saved by the user select Load and navigate to the path where the ﬁle is saved On the other hand to load a list of parameters supplied by CAREL select Load and na...

Page 26: ...W Gas custom dew_e_h Dew point e high 16378 32768 32767 I 32 159 R W Gas custom dew_e_l Dew point e low 15910 32768 32767 I 33 160 R W Gas custom dew_f_h Dew point f high 2927 32768 32767 I 34 161 R W Gas custom dew_f_l Dew point f low 17239 32768 32767 I 35 162 R W Net_alarm Network alarm 0 0 1 D 1 0 R al E6 Emergency_closing_alarm No power supply 0 0 1 D 2 1 R al E5 S1_alarm Probe S1 alarm 0 0 1...

Page 27: ...uccessfully Note lthe user can only select the resolution of the valve control signal 480 or 960 steps Par Description Def Min Max UoM U3 Valve control steps 1 2 480 960 steps 1 1 2 Standby Standby corresponds to a situation of rest in which no signals are received to control the electronic valve it is closed and manual positioning can be activated This status is normally set on the driver when th...

Page 28: ...ion until reaching 0 steps plus a further number of steps so as to guarantee complete closing Following the stop phase the valve returns to standby t t t t OFF ON R OFF ON ST OFF ON S OFF ON A T4 Fig 8 q Key A Control request R Control S Standby T4 Stop position time ST Stop t Time 8 10 Special control states As well as normal control status the driver can have three special states related to spec...

Page 29: ... unblock procedure may or may not succeed depending on the extent of the mechanical problem with the valve If for 10 minutes the conditions are such as to assume the valve is blocked the procedure is run a maximum of 5 times The symptoms of a blocked valve do not necessarily mean a mechanical blockage They may also represent other situations mechanical blockage of the solenoid valve upstream of th...

Page 30: ... event as during the delay the protection function will have an eﬀect Low suction temperature alarm Thelowsuctiontemperaturealarmisnotlinkedtoanyprotectionfunction It features a threshold and a ﬁxed delay 300 seconds and is useful in the event of probe or valve malfunctions to protect the compressor using the relay to control the solenoid valve or to simply signal a possible risk In fact incorrect...

Page 31: ...hes LOP protection activated automatic Protection action already in progress Check parameter LOP protection threshold E3 ﬂashes LowSH protection activated automatic Protection action already in progress Check parameter LowSH protection threshold E4 ﬂashes Low suction temperature automatic No eﬀect Check the threshold parameter E5 ﬂashes Chiusura di emergenza LowSH LOP MOP bassa T P di aspirazione ...

Page 32: ... temperature measured by the driver does not reach low values but there is still return of liquid to the compres sor rack Set more reactive parameters to bring forward the closing of the valve increase the proportional factor to 30 increase the integration time to 250 s Many cabinets defrosting at the same time Stagger the start defrost times If this is not possible if the conditions in the previo...

Page 33: ... protection ineﬀective Make sure that the LOP protection threshold is at the required saturated evaporation temperature between the rated evaporation temperature of the unit and the corre sponding temperature at the calibration of the low pressure switch and decrease the value of the LOP integration time Solenoid blocked Check that the solenoid opens correctly check the electrical connections and ...

Page 34: ...temperature NTC 10kΩ a 25 C 50T90 C Measurement error 1 C in the range 50T50 C 3 C in the range 50T90 C Input 0 10V max 12V Resolution 0 1 fs Measurement error 9 fs maximum 8 typical Power to active probes V REF 5Vdc 2 RS485 serial connection Modbus Lmax 500 m shielded cable earth both ends of the cable shield Assembly on DIN rail or with screws on DIN rail Connectors wire size 0 35 2 5 mm2 12 22 ...

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Page 36: ...REL INDUSTRIES HeadQuarters Via dell Industria 11 35020 Brugine Padova Italy Tel 39 049 9716611 Fax 39 049 9716600 e mail carel carel com www carel com Agenzia Agency EVD mini 0300036EN rel 1 2 23 04 2018 ...

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