User manual ALFANET 95
Contents
1. User manual ALFANET 95 OOOOOOOOOOOO ALARM COOL FAN 1 DEF 2 TER ALFA 95 1 Defr 2 Fan Cool Alarm Ry5 Ry4 Cool Freeze thermostat with a temperature sensor two defrost sensors a day night digital input relays for defrost 1 defrost 2 fan cool and alarm OOOOWWOOOWOOO VDH doc 041617 Version v1 6 Date 10 04 2012 Software 050182 ALFANET 95 RTDF File Do041617 wpd Range 50 0 50 0 C Description The ALFANET 95 is a cooling heating thermostat with various automatic defrost and fan control It can be programmed through the ALFANET PC INTERFACE on the PC Installation On the connection diagram of the ALFANET 95 is show how the sensor the digital input the RS485 network the power supply and the relays should be connected After the ALFANET 95 has been connected to the power supply a self test function will take place after which the measured temperature will appear in the display Operation The ALFANET 95 thermostat can be operated by means of four pushbuttons on the front These pushbuttons are SET view change the setpoint UP raise the setpoint DOWN lower the setpoint C hidden key under the C text Normal operation status During normal operation the temperature of the control sensor Temp is shown in the display Status of the Relays INDICATION LED S RELAY STATUS Press the C key The three lower segments light up and the Se ee eee u2. Connection via screw terminals on supply relay module Special models available on request Fan control settings The ALFANET 95 has various adjustment possibilities for the Fan Normally the fan is always running unless one of the parameters below is set at 1 Parameter 20 1 Fan switch differential active The fan runs only if the temperature of the defrost sensor is lower than the control sensor temperature minus the temperature of the switch differential fan P21 Fan on if T getrost lt T contro a Tranaitt Parameter 25 26 Fan switching on delay after defrosting To prevent the fan from running immediately after defrosting and draining of the evaporator and thus blowing warm air into the cell the following two conditions can be set a The fan is blocked until the defrost sensor measures a temperature that is lower than the set switch on temperature of the fan P25 b The fan is blocked until the switch on delay of the fan P26 is passed When the defrost sensor reaches the switch on temperature P25 within the switch on delay then the fan is released again Parameter 22 1 Fan is off when the compressor is off The fan is turned off if the compressor is off This happens with a delay of parameter 23 Defrost control possibilities The automatic defrost is started on a real time P60 clock basis and stops after the maximal defrost time P30 or earlier if the defrost sensor has reached the set defrost en
3. 3 hours 0 23 off Hrs off 66 Defrost time 3 minutes per 10 min 0 50 off Min 0 67 Defrost time 4 hours 0 23 off Hrs off 68 Defrost time 4 minutes per 10 min 0 50 off Min 0 69 Defrost time 5 hours 0 23 off Hrs off 70 Defrost time 5 minutes per 10 min 0 50 off Min 0 2 Defrost time 6 hours 0 23 off Hrs A Defrost time 6 a per 10 min 0 50 off Min Network number Software version Production year Production week series number x1000 Series number units Dimensions of ALFANET 95 Control unit O unit Connection data Diagram 042527w2 _ SENSORS x zm 3x SM811 SIE I lt ded d 5 s 2 5 5 3 5 2 2 wi AF 1 wire cable QOOWVWDOWOOOO0OO0O 648 Le 4 m lt e 00000 ALFA 95 Modulbox VO UNIT 1 Defr 2 Fan Cool Alarm RySjRy4 Se rde FRONT HOUS ING CONNECTOR no no c no p 17 18 19 20 21 22 23 24 rd TERMINAL HOUSING aa RS485 Network Cable QDDOOMDWDOOOO E eee ee Ooi RS485 Connections L JN NONO C JNO CINOFNCINO Pair l Line A to Line A and RyIRy 3 Ry 1 Ry RyIRy Line B to Line B S147 473 2 21111 Pair 2 2x Gnd to Gnd 5 Shield only at one side to Earth Connect a 250 Ohm Terminator Resistor SUPPLY 5x RELAY OUTPUTS between Line A and Line B at both cable ends RS 485 NETWORK CONNECTIONS 2 twisted pair shielded cable One of the Controllers can be the PC Interface Repeater is
4. also a contr Place Terminator resistor of 250 Ohm only at both Rn ends of the RS485 cable between line A and line B May be provided in the controller with a jumper For signal conditioning Place Pullup down resistors Network connections pet Shield only at lt Shield only at only at one point in the air 1 one side of d onesideof Network May be provided in Connect A HI to A HI T the cable S T thecable the controller with jumpers Connect B LO to B LO to Earth to Earth Pair 2 Or use ALFA 1 TERMINATOR Connect GND 0V to GND 0V Shield Connect Shield to clean Earth ECE ECCE NT Endpoint Network cable Connection Network cable Endpoint only on one side of cable Network _ 2 twised pair shielded point 2 twised pair shielded Network min 0 5mm Network min 0 5mm Pair 1 A B Pair 2 Gnd Max Cable lenath 1KM Pair 1 A B Pair 2 Gnd Note 1 AVOID LONG STUB CABLES No longer than 0 5M otherwise use a Repeater Function diagram Function COOL Temp Diff Setpoint Address VDH Products BV Tel 31 0 50 30 28 900 Produktieweg 1 Fax 31 0 50 30 28 980 9301 ZS Roden Email info vdhproducts nl Netherlands Internet www vdhproducts nl
5. d temperature P31 The ALFANET 95 has a number of automatic defrost possibilities that can be set with the following parameters Parameter 24 Type of defrost The ALFANET 95 has three possibilities for defrosting P24 0 At defrost only the relay FAN is switched on natural defrosting P24 1 At defrost only the relay DEFR is switched on hot gas electrical defrosting P24 2 At defrost the DEFR and the FAN relays are both switched on hot gas electrical fan defrosting Parameter 60 1 Defrosting on the real time clock Here the defrosting is started at fixed times P61 up to and including P72 Adjusting the sensor The control sensor can be adjusted by means of the Offset control sensor parameter 05 The defrost sensors can be adjusted by means of the Offset defrost sensor parameters 08 and 11 For readout the temperature of the defrost sensors choose parameters 07 and 10 Should a sensor of the ALFANET 95 indicates 2 C too much for example Then the according Sensor Offset must be lowered by 2 C Operation of the Alarm When there is an error or an alarm a error code message appears in the display The ALFANET 95 remembers this error message even if the problem has already been solved The error message can be reset with the SET key lf after pressing the SET key reset alarm the alarm is not yet resolved then the ALFANET 95 shows the temperature and error code alternately if the alarm has been resolved the
6. ed automatically by internal parameters Defrosting can also be done manually Stop If defrosting is taking place defrosting can be stopped manually by pressing the DOWN and UP keys simultaneously Start If defrosting is not taking place then defrosting can be started manually by pressing the DOWN and UP keys simultaneously Technical data Type ALFANET 95 Cool Defrosting Thermostat CONTROL UNIT Range 50 0 50 0 C Read out 93 digit 7 segments display Accuracy 0 5 of the range Status LEDs ALARM COMPR FAN DEFR 1 and DEFR 2 On display via C key Operation via pushbuttons on the front Front Polycarbonate IP65 Network RS485 network 2x twisted pair shielded at the back A B Gnd Dimensions 35x 77x 71 5mm hbd Panel cutout 29x 70mm hb O UNIT Supply 230 Vac 50 60Hz 5 10 Max 3VA Relays These two relays have one common Ry 1 Alarm SPDT NO NC 250V 8A cos p 1 Ry 2 Cool SPST NO 250V 8A cos p 1 And these three relays have one common Ry 3 Fan SPST NO 200V 8A cos p 1 Ry 4 Defrost 2 SPST NO 250V 8A cos p 1 Ry 5 Defrost 1 SPST NO 250V 8A cos p 1 Sensors 3x SM 811 2 wire Temp Defr 1 Defr 2 PTC 10000 25 C Contact input 1x Day night contact input open night shift active Dimensions 90x71x58mm hbd for rail mounting Equipped with memory protection in case of power failure Equipped with a self testing function Equipped with sensor failure detection
7. n the error code disappears and the temperature is shown again Error messages The following error messages may appear in the display of the ALFANET 95 LO Minimum alarm solution E1 E2 E3 HI Maximum alarm Check if sensor is properly connected E1 Control sensor defect Check sensor 10000 25 C E2 Defrost sensor 1 defect Replace sensor ES Defrost sensor 2 defect solution EEE EEE Settings have been lost Program the settings again L Incase of a short circuited sensor the error codes E and L will alternate in the display indicating a short circuited sensor H Incase of a disconnected sensor the error codes E and H will alternate in the display indicating a disconnected sensor NOTE Parameters 12 and 13 can be used to prevent or delay occasionally occurring E1 messages Setting internal parameters In addition to adjusting the setpoint a number of internal adjustments can be made including the differentials sensor offsets setpoint range compressor settings fan settings and the defrosting settings By pressing the DOWN key for longer than 10 seconds it is possible to enter the internal programming menu In the left hand display the upper and lower segment will blink to indicate this mode Using the UP and DOWN keys the desired parameter can now be selected see the parameter table When the desired parameter has been selected the value of the parameter can be read
8. out by pressing the SET key The parameter value can now be changed by pressing the SET key together with the UP or DOWN key If after 20 seconds no key has been pressed the ALFANET 95 will revert to the normal operation mode Parameters ALFANET 95 Para Description of Parameter Range Standard meter value Switching differential Minimum adjustable setpoint Maximum adjustable setpoint Readout above 10 C in whole degrees 0 1 15 0 C 50 50 C 50 50 C 0 No 1 Yes Offset control sensor Defrost sensor 1 present Readout defrost sensor 1 15 0 15 C 0 No 1 Yes Offset defrost sensor 1 15 0 15 C Defrost sensor 2 present 0 No 1 Yes Readout defrost sensor 2 Offset defrost sensor 2 15 0 15 C Extra damping on control sensor E1 control sensor defect delay Readout change only at control unit not on ALFANET 0 No 1 Yes 0 99 Seconds 15 Compressor anti shuttle time 0 99 Minutes 10 belonging to parameter 16 16 Compressor shuttle protection 0 3 0 0 start up delay in seconds 1 start up delay in minutes 2 delay between switch off and switch on minutes 3 delay between switch on and switch on min Para Description of Parameter Range o Standard meter value 1 Control alarm 50 Current time hours 0 23 Hours 51 Current time minutes 0 59 Minutes Fan switch differential active 0 No 1 Ye
9. pper vertical segments show the status of the five relays see diagram Relay is active when the segment lights up The lower three segments are always on during status display and the upper segments light up as a relay is active Viewing the setpoint By pressing the SET key the setpoint becomes visible At the same time the decimal point of the right hand display will blink as an indication that the setpoint is being read A few seconds after the SET key has been released the setpoint will disappear and the measured value will again become visible Changing the setpoint Press the SET key so that the setpoint appears on the screen Release the SET key By now pressing the SET key and at the same time the UP or DOWN keys the setpoint can be adjusted A few seconds after the keys have been released the measured value will again appear in the display Day night function The ALFANET 95 has also the possibility to work with night shift parameter P80 of the setpoint to do so the external contact must be opened Day Contact day night closed day mode Controller works on setpoint Night Contact day night opened night mode Controller works on setpoint P80 night shift F i Setpoint 10 0 C and P80 3 0 C than the control setpoint becomes 10 0 3 0 7 0 C Remark The day night function does not work on the real time clock of the ALFANET 95 Start stop defrost cycle The defrost cycle is stopped and start
10. s Fan switch differential 0 5 50 0 C x Fan off if compressor is off 0 No 1 Yes 0 Fan switch off delay 0 90 Minutes 0 Type of defrost O only fan relay 0 Natural 0 1 only defrost relay 1 Hot gas Elec 2 defrost relay fan relay 2 Hot gas Elec Fan Fan switch on temperature after defrost 50 50 C 2 0 Fan switch on delay time after defrost 0 90 Minutes 0 Drip off time 0 90 Minutes 0 Maximum defrost time 0 99 Minutes 15 Defrost ending temperature 50 50 C 2 0 Display fixed during defrost 0 No 1 Yes 0 Defrost cycle time 1 99 hours 12 Defrost cycle time based on compressor on time 0 No 1 Yes 0 After power failure starting with defrost cycle 0 No 1 Yes 0 Defrost delay after power failure 0 99 minutes 0 40 Type of alarm 0 None 1 1 Absolute 2 Relative 41 Minimum alarm setpoint 50 50 C 50 42 Maximum alarm setpoint 50 50 C 50 43 Time delay maximum alarm 0 99 Minutes 0 44 Time delay minimum alarm 0 99 Minutes 0 45 Compressor on at control sensor failure 0 No 1 Yes 0 46 Alarm off after manual reset 0 No 1 Yes 0 47 Alarm off after alarm is solved 0 No 1 Yes 0 48 Function alarm relay 0 Watch alarm 0 Real time defrost active 0 No 1 Yes 0 61 Defrost time 1 hours 0 23 off Hrs off 62 Defrost time 1 minutes per 10 min 0 50 off Min 0 63 Defrost time 2 hours 0 23 off Hrs off 64 Defrost time 2 minutes per 10 min 0 50 off Min 0 65 Defrost time
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