User Manual ALFA 20 and ALFANET 20
Contents
1. sak x Shield only at Lt Shield only at a m 2 one side of d a One side of Sje j g the cable 5 the cable J to Earth to Earth A MO Q IR A a Endpoint Network cable Connection Network 2 twised pair shielded point i min 0 5mm Network Pair 1 A B Pair 2 Gnd Max Cable lenath 1KM ae o m o n y n y a y N G S O S S S a i o n y a a KDKDCPTMOAJKDK DCAD ICICHT AXED Pt lt lt a i ILS CSS eT X SR SORE KIM OC OC mK Pt _ _ _ Place Terminator resistor of 250 Ohm only at both 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 ov Network connections only at one point in the aj gt Pair 1 Network May be providedin Connect A HI to A HI the controller with jumpers h oo B LO to B LO c Z Or use ALFA 1 TERMINATOR 5 Connect GND 0V to GND 0V Shield Connect Shield to clean Earth Network cable Endpoint only on one side of cable 2 twised pair shielded Network min 0 5mm Pair 1 A B Pair 2 Gnd Note 1 AVOID LONG STUB CABLES No longer than 0 5M otherwise use a Repeater Adresse VDH Products BV Produktieweg 1 9301 ZS Roden Nederland Tel 31 0 50 30 28 900 Fax 31 0 50 30 28 980 Email info vdhproducts nl Internet www vdhproducts nl2. Setting internal parameters Next to the adjustment of the setpoint some internal settings are possible like sensor offset and network number By pushing the DOWN key more than 10 seconds you enter the internal programming menu In the left display the upper and lower segment are blinking Over 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 together with the SET key allows you to change the value of this parameter lf after 20 seconds no key is pushed the ALFA NET 20 changes to it s normal operation mode Parameters ALFA NET 20 Para a ion parameter OoOo y S Parameter Rae a Standard cE a 04 offset Offset temperature sensor sensor 15 15 15 156 90 Network number Only ALFANET 95 Software version 96 Production year 97 Production week 98 Serial number x1000 99 Serial number units Adjustment sensor The sensor can be adjusted by using the Sensor Offset parameter 04 Indicates the ALFA NET 20 e g 2 C too much the Sensor Offset has to de decreased with 2 C Error messages In the display of the ALFA NET 20 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 Reprog
3. User Manual ALFA 20 and ALFANET 20 Thermometer VDH doc 070697 Versie v1 1 Datum 03 10 2008 Software _ALFA 10 20 30 File Do070697 wp8 Range See Sticker Function The ALFA NET 20 is a digital thermostat for panel mounting The ALFANET 20 has a RS 485 network connection so it can be read out and adjusted on the Alfanet Installation On the topside of the ALFA NET 20 is shown how the sensor power supply and network have to be connected After connecting the ALFA NET 20 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 20 Thermostat can be controlled by three hidden push buttons on the front These keys are SET view change the setpoint DOWN decrease the setpoint a UP increase 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 at SET key 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 shows again in the display
4. ram the settings Technical details Model ALFA 20 Thermometer ALFANET 20 Thermometer with Network Range 50 50 C readout per 1 C or else see Sticker Supply 230Vac 2 5VA 50 60Hz or else see Sticker Control by hidden push buttons on the front Communication RS485 Network 2x twisted pair shielded min 0 5mm Front Polycarbonate Sensor SM 811 2m 10000 at 25 C Dimensions 144 x 72 x 50mm hbd Panel hole 139 x 67mm hb cutout in front Provided with memory protection during power failure Connection with screw terminals on the back side Equipped with self test function and sensor failure detection Special version on request available Dimensions Inbouwmaten Connections Shield only at one side of the cable to Earth Place both term jumpers J2 J3 at both ends of the RS485 network cable for termination Pair 2 2xGND OV to 2xGND 0V Cable Min 0 5mm and max lenght 1KM Connect Pair 1 Line A to Line A and Line B to Line B Supply 1 Relay ayRs4e5 ite while sovac output Network cable 2 T2 T1 50 60Hz SPDT 2xTwisted pair Temp sensor s or else see Max 16A Shielded type SM811 sticker at cos 1 Remarks 1 No relay on ALFA NET 20 2 Optional second sensor 3 RS485 only at ALFANET series RS 485 NETWORK CONNECTIONS 2 twisted pair shielded cable One of the Controllers can be the PC Interface Repeater is also a contr
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