User manual ALFA 79 ST-PID Hygrostat.
Contents
1. User manual ALFA 79 ST PID OUT 1 OUT2 ALARM Hygrostat RA ALFA 79 VDH doc 080657 Version v1 1 Date 13 04 2010 Software ALFA79 ST PID File Do080657 wpd Range 0 100 RH Installation On the upper side from the ALFA 79 ST PID is shown how the sensor supply and relays should be connected After power up a self test is started If the self test is completed the measured humidity will be shown on the display Control The ALFA 79 ST PID hygrostat can be controlled by four push buttons on the front SET viewing changing the adjusted value and reset alarm UP raise the adjusted value DOWN lower the adjusted value RH hidden key above the SET key Viewing the set points By pushing the SET key the adjusted set point can be read out The led set also starts flashing A few seconds after releasing the SET key the set point disappears and the measured value will be visible again Changing set point Push the SET key and the set point appears in the display Release the SET key Push the SET key again together with the UP or DOWN keys to change the set point A few seconds after releasing the SET key the set point disappears and the measured humidity is shown again Status of the Relays By pushing the hidden RH key the display shows the status of the relays The three digits are indicating the status from the relays hereby O off and 1 on The code 110 means that relay 1 and relay 2 are on and2. ad out per 1 RH 3 digit 7 segments display LED SET en LED RH 12 Vac 50 60Hz 5 10 Ry1 solid state output 12Vdc Ry2 spdt C NO NC 250V 8A coso 1 or 250V 5A coso 0 4 Through push buttons on the front Polycarbonate 0 10Vac 0 100 RH C NO contact 100 output 35 x 77 x 71 5mm hwd 29 x 71mm hw 0 596 from the range pulse modulating Ri 10KOhm Potential free input contact 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 ALFA 79 ST PID Para Description Parameter Range Default Meter value 01 Proportional band 1 15 RH 5 02 Integration time 0 99 Seconds 0 off 03 Differential action percentage 0 100 0 off 04 Cycle time 0 999 Seconds 20 05 Offset humidity sensor 15 415 RH 0 10 Switching offset relay 2 0 4 20 RH 10 11 Switching differential relay 2 1 5 RH 1 zd 20 Minimum adjustable set point 0 100 RH 0 Maximum adjustable set point 0 100 RH 100 Control delay after power failure 0 99 min Forced solid state output at sensor failure O No 1 100 out Forced relay 2 output at sensor failure O No 1 Yes 0 0 0 Software version 0 255 Produktion year 00 99 Produktion week 1 52 Serial number x1000 0 255 Serial number units 0 999 100 Internal P I c
3. ontrol signal 0 EE Beete ZE 12V E Output 7 7 7 SES 7 i LO LE a EE ee E deeg Dee d nr Proportional band Setpoint Relay 2 tout P eiav zZ outpu Teo OFF Function Relay 2 RH Relay 2 Setpoint Dimensions Connections Trafo 3VA 230 12Vac VDH art nr 350 010073 230Vac Address VDH Products BV Produktieweg 1 9301 ZS Roden The Netherlands ALFA 79 ST PID me aa 45V Dig input closed QV open oO o gt t 77 CO fo cC KR KS O gt gt e S N D D m r N Clo zO cd CG r lt L K cz mdi z ono kal kel CG 24Vac State oj oj c o Ol gt 5 Relay gt gt amp b al zi EA HO Relay 2 POWER contact SUPPLY Humidity 1 spdt See L SES Tel 31 0 50 30 28 900 Fax 31 0 50 30 28 980 Email info vdhproducts nl Internet www vdhproducts nl
4. relay 3 is off Setting internal parameters Next to the adjustment of the set point some internal settings can be made like differentials sensor adjustments set point range and alarm settings By pushing the DOWN key for more than 10 seconds you enter the internal programming menu On the left display the upper and the lower segments are flashing 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 no key is pushed for 20 seconds the ALFA 79 ST PID changes to it s normal operation mode Sensor adjustments The sensor can be adjusted by using the offset sensor parameter 05 Indicates a sensor e g 296 RH too much the according Sensor offset parameter has to be decreased with 296 RH Error codes On the display from the ALFA 79 ST PID can appear the following error codes E1 RH sensor defect EE Adjustments are lost Solution E1 Check if the sensor is connected well Check RH signal 0 100 RH 0 10Vdc Replace the sensor solution EE Reprogram the adjustments Technical details Type Range Read out Status LED s Supply Solid state Relays Control Front Input voltage Input contact Dimensions Panel cut out Accuracy ALFA 79 ST PID Hygrostat 0 100 RH re
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