User manual ALFANET 79 Hygrostat.
Contents
1. N 230Vac Address VDH Products BV Produktieweg 1 9301 ZS Roden The Netherlands GND Common OV 4 oN Relay outputs RH970 sensor LC95 2 sensor RH95 2 sensor Tel 31 0 50 30 28 900 Fax 31 0 50 30 28 980 Email info vdhproducts nl Internet www vdhproducts nl2. Function Relays 3 1 Humidify 2 Dehumidify 3 Alarm Offset Humidity sensor 15 15 RH Switching differential 1 15 RH Switching offset relay 15 15 RH Switching differential 1 15 RH Switching offset relay 15 15 RH Switching differential 1 15 RH Switching offset relay 3 15 15 RH None Absolute Relative 100 RH 100 RH 99 min 99 min watchdog al regulated al No Yes No Yes Alarm mode Minimum alarm setpoint Maximum alarm setpoint Time delay minimum alarm Time delay maximum alarm Function alarm relay Auto reset alarm after failure recovering Manual reset alarm relay with set key 0 1 2 0 0 0 0 0 1 0 1 0 1 Control delay after power failure 99 min Forced relay function at sensor failure None Humidify Dehumidify Time correction at realtime clock Network number Software version Production year Production week Serial number x1000 Serial number units c VDH Products BV Dimensions 77 elj X ap 00 bd S N ALFA 3x j SS O N E e aee t9 y T I 69 5 38 Connections REMARK Connect a 250 Ohm Resistor between pe c Line A and Line B at both CABLE ENDS koj op of RS485 Network 2 wire with shield iri armike ng w Qs ut oO nN 5 ate oa FFE ALFANET 79 5 gS oo cw Trafo 3VA o 230 12Vac 0 VDH art nr 350 010073
3. User manual ALFANET 79 RH Hygrostat SET ser ALFA 79 OUT 1 m OUT 2 ALARM VDH doc 010668 Version v1 0 Datum 19 03 2001 Software ALFA NET 79 File Do010668 WP8 Range 0 100 RH Installation On the topside of the ALFANET 79 is shown how the sensor power supply and relays has to be connected After connecting the ALFANET 79 to the power supply a self test function is started As this test is finished the measured humidity appears in the display And adjustable thru the ALFANET PC INTERFACE on the PC Control The ALFANET 79 Hygrostat can be controlled by four push buttons on the front These keys are SET view change setpoint and reset alarm UP increase value DOWN decrease value RH hidden key above SET key and behind RH symbol View setpoint By pushing the SET key the setpoint appears in the display The decimal point of the last display starts blinking to indicate this After a few seconds after releasing the SET key the setpoint disappears and the measured temperature is shown again Changing setpoint Push the SET key and the setpoint appears in the display Release the SET key Now push the SET key again together with the UP or DOWN keys to change the setpoint After a few seconds after releasing the SET key the setpoint disappears and the measured temperature is shown again Status of the Relays By pushing the hidden C key the display shows the status of the relays Each display segmen
4. t shows the status of the relay output showing 0 off and 1 0n The code 110 means relay 1 and relay 2 are on and relay 3 is off Setting internal parameters Next to the adjustment of the setpoint some internal settings are possible like differentials sensor adjustments setpoint range and function of the hygrostat By pushing the DOWN key for more than 10 seconds you enter the internal program ming menu In the left display the upper and the lower segments are blinking Over 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 and DOWN keys allows you to change the value of this parameter If after 20 seconds no key is pushed the ALFANET 79 changes to it s normal operation mode Sensor adjustment The humidity sensor can be adjusted by using the Offset Humidity sensor parameter 05 Indicates the ALFANET 79 e g 2 too much than the Offset Humidity sensor parameter 05 has to be decreased with 2 Error messages In the display of the ALFANET 79 the following error messages can appear rLO Minimum RH alarm Solution E1 rHI Maximum RH alarm Check if sensor is connected correctly E1 RH sensor failure Check RH signal 0 100 RH 0 1 Vdc Replace sensor EE Settings are lost Solution EE Reprogram the settings L In case of sensor short circui
5. t the display alternates between error code E and L as indication for a short circuit sensor H In case of open circuit sensor the display alternates between error code E and H as indication for a open circuit sensor Reset Alarm When a error messages appears it can be reset by pushing the SET key The function of this key depends on parameter P37 Technical details Type ALFANET 79 Hygrostat Range 0 100 RH read out per 1 RH Read out 3 digit 7 segments display Status LEDs LED SET and LED RH Supply 12 Vac 50 60Hz 5 10 Relays Ry1 SPST NO 250V 8A cos p 1 of 250V 5A cos 0 4 Ry2 SPST NO 250V 8A cos 1 of 250V 5A cos p 0 4 Ry3 SPDT NO NC 250V 8A cos p 1 of 250V 5A cos 0 4 The three relays have one common C Control Thru pushbuttons on front Front Polycarbonate Sensor RH 95 2 12Vdc 0 100 RH 0 1Vdc Communication RS485 Network 2 wire shielded min 0 75mm A B and GND Dimensions 35 x 77 x 71 5mm HWD Panel cutout 29 x 71mm HW Accuracy 0 5 of range Provided with memory protection during power failure Equipped with self test function and sensor failure detection Connection with screw terminals Special version on request available Parameters ALFANET 79 Para Description Parameter Range Default meter Value Function Relays 1 1 Humidify 2 Dehumidify 3 Alarm Function Relays 2 1 Humidify 2 Dehumidify 3 Alarm
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