User Manual ALFA 29 and ALFANET 29
Contents
1. GND 0V of the RS485 network cable for termination Cable Min 0 5mm and max lenght 1KM Connect Pair 1 Line A to Line A and Line B to Line B L x z Supply Relay output RS 485 AN 230Vac SPDT Max 16A Network cable RH sensor 50 60Hz at cosp 1 2xTwisted pair Signal 0 1Vdc or else see no relay at Shielded 0 100 RH sticker ALFA NET 20 only at ALFANET 20 RH or ALFANET 29 RS 485 NETWORK CONNECTIONS 2 twisted pair shielded cable One of the Controllers can be the PC Interface Repeater is also a contr 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 a KDLC pacca RH970 LC95 2 RH95 2 RH sensor RH sensor RH sensor 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 gt Pair 1 Network May be providedin Connect A HI to A HI the controller with jumpers ji oo B LO to B LO Or use ALFA 1 TERMINATOR S Connect GND 0V to GND 0V KDE DOMIKDCDOOTHINOKS2. PES Shield PRPORIK SKC POMC K KP 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 nl
3. User Manual ALFA 29 and ALFANET 29 Dehumidify Humidify Hygrostat VDH doc 070703 Version v1 0 Date 04 07 2007 Software 061196 ALFA 19 29 39 File Do070703 wpd Range 0 100 RH per 1 RH Function The ALFA NET 29 is a digital hygrostat for panel and wall mounting The function from the hygrostat can be programmed for dehumidify or humidify The ALFANET 29 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 29 is shown how the sensor power supply and relay have to be connected After connecting the ALFA NET 29 to the power supply a self test function is started As this test is finished the measured relative humidity appears in the display When the relay is activated the led on will light up in the display Control The ALFA NET 29 hygrostat can be controlled by three push buttons 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 The led set starts blinking A few seconds after releasing the SET key the setpoint disappears and the measured value is shown again 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
4. ar 00 99 97 Production week 1 52 98 Serial number x1000 0 255 99 Serial number units 0 999 1 During delay time the LED on is flashing Adjustment sensor The sensor can be adjusted by using the Sensor Offset parameter 04 Indicates the ALFA NET 29 e g 2 RH too much the Sensor Offset has to de decreased with 2 RH Error messages In the display of the ALFA NET 29 the following error messages can appear EE Settings are lost Solution Reprogram the settings Technical details Model ALFA 29 Dehum Hum Hygrostat ALFANET 29 Dehum Hum Hygrostat with Network Range 0 100 RH readout per 1 RH Supply 230 Vac 50 60Hz Relay SPDT 250V 16A C NO 8A C NC cos phi 1 Control by push buttons on the front Communication RS485 Network 2x twisted pair shielded min 0 5mm Front Polycarbonate Sensor RH95 2 LC95 2 or RH970 3 wire V Signal OV Dimensions 144 x 72 x 50mm hwd Panel hole 139 x 67mm hw at panel mounting Provided with memory protection during power failure Connection with screw terminals on the back side Special version on request available Function Diagram Function HUMIDIFY or Function DEHUMIDIFY gt Humidity Humidity l Diff Diff Setpoint Setpoint Dimensions Inbouwmaten Connections Shield only at one side of the cable to Earth Place both term jumpers J2 J3 at both ends Pair 2 2xGND OV to 2x
5. few seconds after releasing the keys the measured value shows again in the display Setting internal parameters Next to the adjustment of the setpoint some internal settings are possible like differential sensor offset setpoint range and the function dehumidify or humidity 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 29 changes to it s normal operation mode Parameters ALFA NET 29 Para Description Parameter faust Standard meter Value 01 Switching differential 1 15 RH 02 Minimum setpoint 0 100 RH 03 Maximum setpoint 0 100 RH 04 Offset RH sensor 15 415 RH 10 Startup delay after power failure 0 99 Minutes 15 Function dehumidify or humidify 0 Dehumidify 1 Humidify 16 Switch on delay relays 1 0 99 i 17 Switch off delay relays 1 0 99 18 Parameter 16 17 in sec or min 0 Seconds 1 Minutes 19 Minimum on time relays 0 99 Minutes 20 Minimum off time relays 0 99 Minutes 90 Network number 1 250 95 Software version 0 255 96 Production ye
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