User manual ALFA(NET) 35 DP Cool/Defrost
Contents
1. User manual ALFA NET 35 DP Cool Defrost Thermostat defrost VDH doc 053813 Version v1 3 Date 12 05 2006 Software ALFA NET 35 DP File Do053813 WPD Range 10 40 C per 0 1 C Function The ALFA NET 35 DP 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 DP you can see how the sensor power supply and relay have to be connected After connecting the ALFA NET 35 DP 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 DP thermostat can be controlled by three pushbuttons on the front These keys are SET view change the setpoint UP increase the setpoint DOWN decrease the setpoint Viewing setpoint By pushing the SET key the setpoint appears in the display 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 Now push the SET ke2. ine B Repeater is May be provided in the also a contr controller with a jumper For signal conditioning Place Pullup down resistors ov Network connections oe Shield only at d Shield only at only at one point in the gt Pair 1 S m one side of onesideof Network May be provided in Connect A HI to A HI Eje E O T thecable 5 T thecable the controller with jumpers Connect B LO to B LO 7 j2 to Earth to Earth Oruse ALFA 1 TERMINATOR g Palr 2 Phebe S lt gt gt oxi OK KDEKDOPCOHIMIED Connect GND 0V to GND 0V Shield 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 AIB 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 31 0 50 30 28 900 Fax 31 0 50 30 28 980 Email info vdhproducts nl Internet www vdhproducts n
3. meter 05 Defrost cycle time Defrost time Defrost delay after power failure if parameter 14 is 1 Startup delay after power failure 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 69 5 Connection diagram ALFA NET 3X series If applicable Trafo 3VA 230 12Vac VDH art nr 350 010073 al REMARK To terminate RS485 Network Connect a 250 Ohm resistor between Line A and Line B at both cable ends lt lt A i CO N P i zac _ 1 cm cm Ww gt co gt pee oe ee co QO O Hi ab U O w v fab COM a P oO E e tut vsr ned Bee EE Noo Li 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 _____ ends of the RS485 cable PC Interface between line A andl
4. too much the Sensor Offset has to be decreased by 2 C Error messages In the display of the ALFA NET 35 DP the following error messages can appear Er Sensor broken Solution Check if the sensor is connected correctly Check the sensor 1000Q at 25 C Replace the sensor EE Settings are lost Solution Reprogram the settings Technical details Model ALFA NET 35 DP Cool Defrost Thermostat Range 10 40 C readout per 0 1 C Supply 230 Vac or 24Vdc or 12Vdc 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 DP PARA DESCRIPTION PARAMETER RANGE STANDARD METER VALUE Switching differential Le g15 3 Minimum setpoint 10 40 C 10 Maximum setpoint 10 40 C Offset temperature sensor 15 4715 C 0 Compressor start up protection start up delay in sec start up delay in min delay between switch off and Switch on min delay between switch on and Switch on min Compressor start up time belonging to para
5. y 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 lf 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 lf 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 DP 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 35 DP e g 2 C
Download Pdf Manuals
Related Search