User manual ALFA(NET) 39 Hygrostat.
Contents
1. Sensor 0 1Vdc 0 100 RH from RH95 2 LC95 2 or RH970 Be aware Humidity sensors should be external supplied with Sizes 90 x 53 x 58mm hwd Panel hole 46 x 53mm hw Provided with memory protection during power failure Connection with screw terminals on the back side Special version on request available Parameters ALFA NET 39 Switching differential 1 15 SRH Minimum set point 0 100 SRH Maximum set point 0 100 SRH Offset humidiy sensor 15 15 RH 0 dehumidify 1 humidify Switch on delay relay 1 0 99 Switch off delay relay 1 Zoo Parameter 16 17 in sec or min 0 sec 1 min Minimum on time relay 99 min Minimum off time relay 99 min Network number Software version Production year Production week Serial number x1000 Serial number units 1 If delay is active the led will flash Function Diagram Function HUMIDIFY or Function DEHUMIDIFY gt Humidity Diff Diff Setpoint Setpoint Dimensions 60 69 5 Connection diagram gt ALFA NET REMARK To terminate RS485 Network Connect a 250 Ohm resistor between 39 series Line A and Line B at both cable ends If applicable Trafo 3VA 230 12Vac VDH art nr 350 010073 230Vac gt a a eee sy O D E oj o C A Ors oj d x lt So E AA 9 gt j z o5 oe Po Po ee Lee 0 gt r2. User manual ALFA NET 39 Hygrostat et ALFA 39 WN RH VDH doc 071747 Version v1 0 Date 22 06 2007 Software ALFA39 File Do071747 WPD Range 0 100 RH per 1 C Function The ALFA NET 39 is a digital hygrostat for panel mounting The function from the hygrostat can be programmed for humidify or dehumidify The ALFANET 39 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 39 is shown how the sensor power supply and relay have to be connected After connecting the ALFA NET 39 to the power supply a self test function is started As this test is finished the measured humidity appears in the display When the relay is activated the led on will light up in the display Control The ALFA NET 39 hygrostat can be controlled by three push buttons on the front These keys are SET view change the set point UP increase the set point DOWN decrease the set point 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 set point disappears and the measured humidity is shown in the display Changing setpoint Push the SET key and the set point appears in the display Release the at SET key Now push the SET key again and together with the UP or DOWN keys the set point can be changed A few seconds after releasing the keys the mea
3. a as cue Tees Nooo Clone SUPPLY RELAY Optional RS485 RH sensor Vac Vdc OUTPUT NETWORK Input see product SPDT 2 twisted pair 0 1Vdc sticker shielded 0 100 RH 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 and line B Repeater is May be provided in the also a contr controller with a jumper For signal conditioning Place Pullup down resistors Network connections 2 gt Shield only at z Shield only at Only at one point in the Pair 1 m one side of onesideof Network May be provided in Connect A HI to A HI El 7 the cable S 7 thecable the controller with jumpers eooneer B LO to B LO l 6 to Earth to Earth Or use ALFA 1 TERMINATOR Connect GND 0V to GND 0V bA epo Shield v ty T j salieri tet nN V Connect Shield to clean Earth Endpoint Network cable Connection Network cable Endpoint only on one side of cable Network 2twised 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 Tel 31 0 50 30 28 900 Produktieweg 1 Fax 31 0 50 3028980 9301 ZS Roden Email info vdhproducts nl Th
4. e Netherlands Internet www vdhproducts nl
5. sured humidity shows again in the display Setting internal parameters Next to the adjustment of the setpoint some internal settings are possible like differential sensor offset set point range and the function humidify or dehumidify 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 39 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 39 e g 2 too much the Sensor Offset has to de decreased with 2 Error messages In the display of the ALFA NET 39 the following error messages can appear EE Settings are lost Solution Reprogram the settings Technical details Model ALFA NET 39 Humidify dehumidify Hygrostat Range 0 100 RH readout per 1 RH Supply 230 Vac or 24Vdc or 12Vdc Relay SPDT 250V 16A C NO 8A C NC cos phi 1 Communication RS 485 Network 2xtwisted pair shielded only at ALFANET model Control by pushbuttons on the front Front Polycarbonate IP65
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