User manual ALFANET 55 -50/+150 C Cool/Defrost
Contents
1. User manual ALFANET 55 50 150 C COMPR FAN DEFR Cool Defrost thermostat with fan control and RS485 ser Ce a ALFA 55 VDH doc 080704 Version v1 0 Date 23 05 2008 Software ALFA NET 55 75 File Do080704 WPD Range 50 150 C per 1 C Description The ALFANET 55 is a cool defrost thermostat with various defrost and fan control settings It is adjustable thru the ALFANET PC INTERFACE on the PC Installation On the connection diagram of the ALFANET 55 is shown how the sensor power supply and relays has to be connected After connecting the ALFANET 55 to the power supply a self test function is started As this test is finished the measured temperature of the control sensor appears in the display Control The ALFANET 55 thermostat can be controlled by four push buttons on the front These keys are SET view change the set point UP increase value DOWN decrease value MODE relay status key View set point By pushing the SET key the set point appears in the display The decimal point of the last display starts blinking to indicate this After a few seconds after releasing the SET key the set point disappears and the measured temperature is shown again Changing set point Push the SET key and the set point appears in the display Release the SET key Now push the SET key again together with the UP or DOWN keys to change the set point After a few s2. P31 or sooner by reaching the maximum defrost temperature P32 Further has the ALFANET 55 additional parameters to control defrost Parameter 24 Defrost mode The ALFANET 55 has two defrost modes P24 0 While defrosting only the Fan activates Natural defrost P24 1 While defrosting the relay DEFR activates Hotgas Electrical defrost Parameter 34 0 Defrost at fixed interval time In this case parameter 30 is the chosen interval time Parameter 34 1 Defrost based on total Compressor time In this case the Defrost is started as the Compressor has been activated for parameter 30 hours Parameter 36 1 The ALFANET 55 starts with Defrost on Power up After Power up the ALFANET 55 first starts with a delay of parameter 37 minutes before starting Defrost while in delay the ALFANET 55 works normally Parameter 33 1 Compressor active at Defrost P24 1 For hot gas Defrost systems the Compressor needs to be activated while defrosting After Defrost the Drip off time parameter 27 starts During this time the defrost relay and the compressor are not active so the Cool unit can drip off Parameters ALFANET 55 Para Description Parameter Range Default meter Value Switching differential 15 C Minimum set point een C Maximum set point 50 150 C Read out above 10 C per 1 C OzNo 1 Yes Offset Control sensor 15 15 Read out Defrost sensor Offset Defrost sensor 15 15 Start up delay Cool
3. econds after releasing the SET key the set point disappears and the measured temperature is shown again Status of the Relays By pushing the MODE key the display shows the status of the relays Each display segment Shows the status of the relay output showing 0 off and 1 on The code 110 means relay 1 compr en relay 2 fan are on and relay 3 defr is off Manual starting stopping of defrost The defrost cycle is automatic started and stopped These defrost settings thru internal parameters Stop defrost If there is a defrost cycle the defrost can be manually stopped by pushing the UP and the DOWN key simultaneously Start defrost If there is no defrost cycle the defrost can be manually started by pushing the UP and the DOWN key simultaneously Setting internal parameters Next to the adjustment of the set point some internal settings are possible like differentials sensor adjustments set point range compressor fan defrost and alarm settings By pushing the DOWN key for more than 10 seconds you enter the internal programming menu In the left display the upper and the lower segments are blinking Over the UP and DOWN keys the required parameter can be selected see table for the parameters If the required parameter is selected the value can be read out by pushing the SET key Pushing the UP and DOWN keys allows you to change the value of this parameter If after 20 seconds no key is pushed the ALFANET 55 change
4. ing Switch off delay Cooling Parameter 10 11 in Sec or Min 1 Min Minimum on time Cooling 99 Minutes Minimum off time Cooling 99 Minutes Switching differential Fan active OzNo 1 Yes Switching differential Fan 0 150 C Fan off as Compressor is off O No 1 Yes Switch off delay Fan 0 99 Minutes Defrost mode O only fan relay 0 Natural l only defrost relay 1 Switch on delay temp fan after defrost Hotgas Elec Switch on delay time fan after defrost 50 150 C Dripoff time 0 99 Minutes 0 99 Minutes Defrost interval time 1 99 Hours Maximum defrost time 0 99 Minutes End of defrost temperature 50 150 C Compressor on while defrosting O No 1 Yes Defrosting on compressor time O No 1 Yes Temperature display locked during O No 1 Yes defrost cycle Start with defrost after power up OzNo 1 Yes Defrost on delay after power up 0 99 Minutes H 0 0 0 0 0 0 2 0 0 0 2 0 0 12 15 2 0 0 0 0 0 1 Alarm mode None Absolute Relative Minimum alarm set point 150 C Maximum alarm set point 150 C Time delay maximum alarm 99 Minutes Time delay minimum alarm 99 Minutes Control delay after power failure 0 99 Minutes Compressor on at control sensor failure 0 No 1 Yes Compressor off at minimum alarm OzNo 1 Yes Network number Software version Production Year Production Week Serial number x1000 Serial number units Technical details Type Range Supply Relays Con
5. ir shielded cable Controller 1 One of the Place Terminator resistor Controllers of 250 Ohm only at both can be the LL eds of the RS486 cable OOO PC Interface OOO between line A and line B OOO A e END Repeater is A B GND May be provided in the FA s fend RS485 also a contr RS485 controller with a jumper For signal conditioning Place Pullup down resistors Network connections Shield only at Shield onlyat only at one point in the E Pair 1 1 a one side of aone side of Network May be provided in Connect A HI to A HI the cable thecable the controller with jumpers pA 2 pe B LO to B LO a 2 2 to Earth to Earth Or use ALFA 1 TERMINATOR Connect GND 0V to GND 0V mA A e 0 aaan Connect Shield to clean Earth 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 length 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 Address VDH Products BV Produktieweg 1 9301 ZS Roden The Netherlands Function COOL Diff 1 15 C Tel 31 0 50 30 28 900 Fax 31 0 50 30 28 980 Email info vdhproducts nl Internet www vdhproducts nl
6. s to it s normal operation mode Sensor adjustment The temperature sensor can be adjusted by using the Offset control sensor parameter 05 The defrost sensor can be adjusted by using the Offset defrost sensor parameter 07 For read out of the defrost sensor on the display use parameter 06 Indicates a sensor e g 2 C too much the according Sensor offset parameter has to be decreased with 2 C Error messages In the display of the ALFANET 55 the following error messages can appear LO Minimum alarm Solution E1 E2 HI Maximum alarm Check if sensor is connected correctly E1 Control sensor failure Check sensor 10000 25 C E2 Defrost sensor failure Replace sensor EEE Settings are lost Solution EEE Reprogram the settings L In case of sensor short circuit the display alternates between error code E and L as indication for a short circuit sensor H In case of open circuit sensor the display alternates between error code E and H as indication for a open circuit sensor Reset Alarm When a error messages appears it can be reset by pushing the SET key The function of this key depends on parameter P37 Alarm operation As a failure or alarm occurs an error message is shown in the display The ALFANET 55 remembers it s error message although it is already solved The error message is resettable with the SET key As if after pressing the SET key reset alarm the alarm still is not solved than
7. the ALFANET 55 displays the temperature and the error message alternated is the alarm solved then the error message disappears and the temperature is displayed normally Fan control The ALFANET 55 has several parameters for fan control Normally the fan is always active accept for one of the following parameters is set to 1 the fan can be stopped Parameter 20 1 Fan switch differential active The fan is only active when the defrost temperature is parameter 21 lower than the measured product temperature Fanon Tdefr lt Tcontrol Tfandiff P21 As there are no further conditions to switch the fan off Parameter 25 26 Fan on delay after defrost The fan is switched off during defrost and to prevent blowing in hot air in the cabin after defrost and the dripping off time parameter 27 there are two conditions which can be set a The fan is blocked until the defrost sensor measures a temperature lower than the temperature setting of parameter 25 b The fan is blocked until the defrost delay time of parameter 26 has stopped Unless the defrost sensor has reached the temperature setting of parameter 25 Parameter 22 1 Compressor off than Fan off The fan deactivates as the compressor deactivates with a delay of parameter 23 minutes Provided that there are no other conditions to deactivates the fan Defrost control The automatic defrost is started by the defrost cycle time P30 and stopped by the maximum defrost time
8. trol Front Sensors Network Dimensions Panel cutout Accuracy ALFANET 55 Cool Defrost Thermostat 50 150 C readout pro 1 C 230 Vac or 24Vdc or 12Vdc see sticker The three relays have one common Ry 1 Compr SPST NO 250V 8A cos 1 Ry 2 Fan SPST NO 250V 8A cos 1 Ry 3 Defrost SPDT NO NC 250V 8A cos 1 Thru pushbuttons on front Polycarbonate IP65 2x SM 811 2m PTC 10000 25 C RS485 network 2 x twisted pair shielded cable min 0 75mm Attention both network cable ends must be terminated with a 250 Ohm resistor between Line A and Line B 90 x 71 x 58mm HWD 46 x 71mm HW at front mounting 0 596 of range Provided with memory protection during power failure Equipped with self test function and sensor failure detection Connection with screw terminals Special version on request available Dimensions 000000000000 Po l e o 000000000000 90 62 46 JE exo 5 Connections Relay 2 Fan Compressor 0 1 gt oS 4 era Supply Relay 1 230Vac 50 60Hz C Common FAN w w c I I bd 2 a z a2 an gt S 2 E c om D EM oo a t nn dan EN Mic Orn OZ Zn oz wus ow aw RS 485 NETWORK CONNECTIONS 2 twisted pa
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