User manual ALFANET 85 Cool thermostat with fan
Contents
1. 80 Cooling and fan off when door open 81 Maximum cooling and fan off time when door open 82 Control delay after power failure Cooling on at sensor failure RS 485 network number Log interval Software version Production date Serial number Error messages In the display of the ALFANET 85 the following alarm messages can be shown Lo 1 minimum alarm control sensor Hi 1 maximum alarm control sensor E 1 control sensor broken E 2 defrost sensor broken EE1 EE2 settings are lost Solution E1 E2 Check if sensor is connected correctly Check the sensor 10000 25 C Replace sensor Solution EE1 EE2 Program settings again L In case of a short in the sensor the display will alternate between the error code E and L to indicate a short of the sensor H In case op an open sensor circuit the display will alternate between the error code E and H to indicate and open sensor circuit Technical data Type ALFANET 85 thermostat Range 40 50 C with read out per 0 1 C Supply 12 Vdc ac 50 60Hz 5 10 Read out 4 number 7 segment display Status LED cool fan defrost alarm Relay cooling SPST 250V 8A cos phi 1 Relay defrost SPST 250V 8A cos phi 1 Relay fan SPST 250V 8A cos phi 1 Relay alarm SPST 250V 8A cos phi 1 Control by four push buttons on the front Front polycarbonate Sensor 2x SM 811 2m PTC 10000 25 C Digital input door contact potential free Communi2. Offset control sensor Offset defrost sensor Switch on delay cooling Switch off delay cooling Parameter 10 11 in seconds or minutes Minimum on time cooling Minimum off time cooling Fan switch differential active Switch differential fan Fan off if cooling off Switch off delay fan Fan off during defrost Switch on temperature fan after defrost Switch on delay after defrost Defrost interval time Maximum defrost time End of defrost temperature Cooling on during defrost Defrost on compressor run time Display fixed during defrost Maximum display fixed time after defrost Drip off time Start with defrost after power failure Defrost delay after start up Defrost on real time bases Start defrost Start defrost Start defrost Start defrost Start defrost Start defrost Start defrost Start defrost ONHUPWNHE Type alarm Minimum alarm set point Maximum alarm set point Time delay minimum alarm Time delay maximum alarm Reset alarm when alarm disappears Alarm relay off after manual reset of alarm 99 99 sec 1 min 99 minutes 99 minutes No 1 Yes 50 0 C No 1 Yes 99 minutes No 1 Yes 50 0 50 0 C 0 99 minutes 99 hours 0 99 minutes 40 0 50 0 C No 1 Yes No 1 Yes No 1 Yes 99 minutes 99 minutes No 1 Yes 99 minutes none absolute relative 40 0 50 0 C 40 0 50 0 C 0 99 minutes 0 99 minutes 0 No 1 Yes No 1 Yes Para meter
3. User manual ALFANET 85 Cool thermostat with fan coo and defrost control AA alee ALARM HM VDH ALFA 85 VDH doc 080645 Version v1 0 Date 19 05 2008 Software ALFANET85 File Do080645 WPD Range 40 50 C Installation On the side of the ALFANET 85 and on the connection diagram is shown how to connect sensors power supply and the relays After connecting the ALFANET 85 to the power supply a self test function is started Next the measured temperature of the control sensor is shown in the display normal operation mode Control The ALFANET 85 thermostat can be controlled by four push buttons on the front These keys are SET view change the set point UP increase the set point DOWN decrease the set point DEFROST manual start stop the defrost View set point By pushing the SET key the set point is shown Also the decimal point of the most right display starts flashing A few seconds after releasing the SET key the set point disappears and the measured value is shown again Changing set point Push the SET key to show the set point Release the set key By pushing the SET key simultaneously with the UP or DOWN keys the set point can be changed A few seconds after releasing the set key the measured value is shown on the display Read out defrost sensor Push the UP key to show the value of the defrost temperature sensor View clock time Push the UP and DOWN
4. one point in the i gt pl tA HI to A H Network May be provided in Conne o the controller with jumpers g pas B LO to B LO Or use ALFA 1 TERMINATOR Connect GND 0V to GND 0V cxoexo ccce Shield Connect Shield to clean Earth only on one side of cable Endpoint Network cable Network 2twised et eb shielded Pair 1 ABI Pair Gnd Note 1 AVOID LONG STUB CABLES No longer than 0 5M otherwise use a Repeater Dimensions O00000000 000000000 O00000000 000000000 Address VDH Products BV Produktieweg 1 9301 ZS Roden The Netherlands Tel 31 0 50 30 28 900 Fax 31 0 50 30 28 980 Email info vdhproducts nl Internet www vdhproducts nl
5. an be adjusted withe the offset control sensor parameter 05 Indicates the control sensor e g 1 2 C too much the sensor offset should be reduced with 1 2 C The defrost sensor is adjusted with the offset defrost sensor parameter 07 Reset of alarm During alarm the alarm relay and the internal buzzer are activated By pressing the SET key the buzzer will stop and the alarm relay depending on the internal settings will drop The error message remains flashing in the display until the cause of the failure is solved Fan control options The ALFANET 85 has various settings for the evaporator fan Normally the fan runs continuously except if one the the parameters mentioned below is set to 1 Parameter 20 1 Fan switch differential active The fan only runs if the temperature of the defrost sensor is lower than the temperature of the control sensor minus the fan switch differential P 21 Parameter 24 1 Fan off during defrost To prevent that after the defrost and drip off time the fan starts to run and warm air is blown into the cold room two conditions can be set a The fan is blocked until the defrost sensor reaches a temperature lower than the temperature set with parameter 25 b The fan is blocked until the defrost delay of parameter 26 has passed unless the defrost sensor reaches the switch on temperature of parameter 25 If the defrost sensor is broken the ALFANET 85 will run he time of parameter 26 before th
6. cation RS 485 2x twisted pair shielded min 0 8mm Dimensions 106x90x58mm whd Accuracy 0 596 of the range Provided with memory protection during power failure DIN rail mounting Provided with self test function and sensor failure detection Special models available upon request Connections Supply 12Vac dc Ry 4 50 60Hz ALARM RS485 2 wire shielded Network R One of the Controllers can be the PC nterface Repeater is also a contr Controller 1 Controller 2 OOO A B EN RS485 8 EHS S a Shield only at Shield only at z anne side of a one side of E c o the cable the cable d 2 to Earth to Earth MDXDCOXOMCXO a kcoooocc Endpoint Network cable Connection T 2 twised pair shielded Nu 0 5mm Network min Pair 1 A B Pair 2 Gnd Max Cable length 1KM ri s sec KSC kd am Relay outputs Ry 3 DEFROST Ry 2 FAN Ry 1 COOL con FAN DEFROST ALARM ALFA 85 E se alz ret ri ora co HE 2 WLI DOOR DEFROST CONTROL CONTACT SENSOR SENSOR Inputs I 0 S 485 NETWORK CONNECTIONS 2 twisted pair shielded cable Place Terminator resistor of 250 Ohm only at both ends of the RS485 cable Controller x May be provided in the controller with a jumper For signal conditioning Place Pullup down resistors Network connections only at
7. e fan is started Parameter 22 1 Fan off if cooling off The fan is stopped if the cooling is stopped This is done through the delay of parameter 23 Defrost control options The automatic defrost is started by the defrost interval time and stooped after the maximum defrost time or sooner is the defrost sensor reaches the set end of defrost temperature The ALFANET 85 has various automatic defrost options that can be set with the following parameters Parameter 34 0 Defrost with fixed defrost intervals Hereby parameter 30 is always the selected interval time Parameter 34 z 1 Defrost based on the total cooling run time Hereby the defrost is started if the cooling has run the time set with parameter 30 Parameter 38 1 The ALFANET 85 start with defrost when switched on The ALFANET 85 starts with a defrost cycle if the ALFANET 85 is switched on whereby first the defrost swtich on delay parameter 39 is passed During this delay the cooling can be on after which the defrost is started Parameter 33 1 For hot gas defrost systems the cooling is switched on during defrost After the defrost the drip off time parameter 37 is started During this time the defrost relay is not active and the evaporator can drip off During this time the cooling will not run Parameters ALFANET 85 Para Description Range Default meter Value uty tv Uv DD U Switch differential cooling Minimum set point setting Maximum set point setting
8. keys simultaneously The display will show the present time The decimal point between hours and minutes starts flashing Changing time Push the UP and DOWN key simultaneously to show the time By pressing the SET key simultaneously with the UP or DOWN key the time can be set A few seconds after releasing the keys the measured value is shown in the display Start stop defrost cycle The defrost cycle is automatically started and stopped Settings by via the Internal Parameters The defrost can be changed manually STOP If defrost is on the defrost can be stopped manually by pushing the DEFROST key START If no defrost is on the defrost can be started manually by pressing the DEFROST key Setting internal parameters Next to the adjustment of the set point a number of internal settings are possible like differentials sensor offsets set point range cooling settings fan settings and defrost settings By pushing the DOWN key for more than 10 seconds the Internal Parameter Menu is entered The display shows P01 By the UP and DOWN keys the required parameter can be selected see table for parameters When the required parameter is selected press the SET key to show the value of this parameter By pushing the UP or DOWN keys the parameter value can be changed If for 30 seconds no key is pressed the ALFANET 85 will return to its normal operation mode and the changes are stored Adjustment of sensors The control sensor c
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