User manual ALFA(NET) 35 Cool/Defrost Thermostat.
Contents
1. Now push the SET key again and together with the UP or DOWN keys the setpoint can be changed A few seconds after releasing the keys the measured temperature is show in the display Starting stopping defrost The defrost cycle is automatically started and stopped Programming by the internal parameters During defrost the led defrost will light up If there is a defrost cycle the defrost can be stopped by hand pushing the UP key and then the SET key while the UP key is held If there is no defrost cycle the defrost can be started by hand pushing the UP key and then the SET key while the UP key is held Setting internal parameters Next to the adjustment of the setpoint some internal settings are possible like differential sensor offset setpoint range and the defrost function By pushing the DOWN key for more than 10 seconds you enter the internal programming menu In the left display the upper and lower segments are blinking With 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 or DOWN keys allows you to change the value of this parameter If no key is pushed for 20 seconds the ALFA NET 35 changes to it s normal operation mode Adjustment sensor The sensor can be adjusted by using the Sensor Offset parameter 04 Indicates the ALFA NET 352. be provided in the also a contr controller with a jumper For signal conditioning Place Pullup down resistors Network connections Shield only at Shield only at only at one point in the Pair 1 s a one side of one side of Network May be provided in Connect A HI to A HI the aa T the s the controller with jumpers eat a B LO to B LO to Ear to Eart 1 Or use ALFA 1 TERMINATOR Connect GND 0V to GND 0V SSCS axle lt P E E Pipe oec carte ole EDDC NTRIKD Shield CAC Pla MKS PH H DLL LIITA 1 SC ACKI KS CACC rac 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 lenath 1KM Pair 1 A B Pair 2 Gnd Note 1 AVOID LONG STUB CABLES No longer than 0 5M otherwise use a Repeater Address VDH Products BV Produktieweg 1 9301 ZS Roden The Netherlands Tel Fax Email Internet 31 0 50 30 28 900 31 0 50 30 28 980 info vdhproducts n www vdhproducts nl
3. e g 2 C too much the Sensor Offset has to be decreased by 2 C Error messages In the display of the ALFA NET 35 the following error messages can appear Er Sensor broken Solution Check if the sensor is connected correctly Check the sensor 10000 at 25 C Replace the sensor EE Settings are lost Solution Reprogram the settings Technical details Model ALFA NET 35 Cool Defrost Thermostat Range 50 50 C readout per 1 C Supply 230Vac 50 60Hz or else see product sticker max 3VA Relay SPDT 250V 16A C NO 8A C NC cos phi 1 Control by pushbuttons on the front Communication RS 485 Network 2xtwisted pair shielded only at ALFANET model Front Polycarbonate IP65 Sensor SM 811 2m 1000Q at 25 C Sizes 35 x 77 x 71 5mm hwd Panel hole 28 x 70mm hw Provided with memory protection during power failure Connection with screw terminals on the backside Equipped with self test function and sensor failure detection Special versions are available upon request Parameters ALFA NET 35 Switching differential 1 15 Minimum setpoint 50 50 C Maximum setpoint 50 50 C Offset temperature sensor 15 415 C Compressor start up protection 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 minutes Compressor start up time belonging to parameter 05 Defros
4. User manual ALFA NET 35 Cool Defrost Thermostat defrost set VDH doc 053812 Version v1 4 Date 10 11 2009 Software ALFA NET 35 File Do053812 wpd Range 50 50 C per 1 C Function The ALFA NET 35 is a digital thermostat for panel mounting The thermostat controls the cooling and defrost Defrost will be done by temporarily switching off the cooling natural defrost The defrost starts on intervals or on compressor runtime The defrost stops on time The ALFANET 35 has a RS 485 network connection so it can be read out and adjusted on the Alfanet Installation On the topside op the ALFA NET 35 you can see how the sensor power supply and relay have to be connected After connecting the ALFA NET 35 to the power supply a self test function is started As this test is finished the measured temperature appears in the display When the relay is activated the led on will light up in the display Control The ALFA NET 35 thermostat can be controlled by three pushbuttons on the front These keys are SET view change the setpoint wa UP increase the setpoint DOWN decrease the setpoint Viewing setpoint By pushing the SET key the setpoint appears in the display The led set starts blinking A few seconds after releasing the SET key the setpoint disappears and the measured temperature is shown in the display Changing setpoint Push the SET key and the setpoint appears in the display Release the SET key
5. t cycle time 1 99 hours Defrost time 0 99 minutes Defrost delay after power failure 0 99 minutes if parameter 14 is 1 Startup delay after power failure 0 99 minutes Relay on at sensor failure Defrost cycle time based on compressor on time Temperature display locked during defrost cycle After power failure starting with defrost cycle Maximum time display locked after defrost if parameter 13 1 Network number Software version Production year Production week Serial number x1000 Serial number units Function diagram Function COOL Diff 1 15 C setpoint 50 50 C Dimensions 60 Connection diagram ALFA NET 3X series If applicable Trafo 3VA 230 12Vac VDH art nr 350 010073 230Vac REMARK To terminate RS485 Network Connect a 250 Ohm resistor between Line A and Line B at both cable ends m d a gt pee oe oe i aN oj o o OW ojl v u wr w 6 oow z P O ToU VD gt Pr cct Mao SUPPLY RELAY Optional RS485 SM811 Vac Vdc OUTPUT NETWORK Temp see product SPDT 2 twisted pair sensor sticker shielded RS 485 NETWORK CONNECTIONS 2 twisted pair shielded cable One of the Place Terminator resistor Controllers of 250 Ohm only at both can be the _____ehds of the RS485 cable ___ PC Interface between line A and line B Repeater is May
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