User manual ALFANET 77 mmWK Pressostat
Contents
1. 77 70 s e N ive N MEN M 9 9 s95 T Z 3 Vac VDH art ar O 359 010973 ooo QD o aH E L 230Vac l2Vac Address VDH Products BV Produktieweg 1 9301 ZS Roden The Netherlands Connections REMARK Connect a 250 Ohm Resistor between Line A and Line B at both CABLE ENDS of RS485 Network 2 wire with shield ALFANET 77 mA iS or e w as ro C vo oco lt os 1 LO O oj o x ovoj cc 1 ee ANY oo os fae Common c Ryl no Ry2 no Ry3 no Ry3 nc Relay 1 Out 1 Relay 2 Out 2 Relay 3 Out 3 Tel Fax Email Internet Alarm o o gt gt qm LJ O lt Lond gt gt nj 4 8 B8 o N a Z H N B O b o Ss 3 gt EE 2 ux oc c5 D SUPPLY a 12Vac EE o alz o S 3 e5 an Na Ov Sig V U3 o a PX25 2 AP PX25 AP Pressure Pressure sensor sensor 31 0 50 30 28 900 31 0 50 30 28 980 info vdhproducts nl www vdhproducts nl2. 3 1 Raise the pressure 2 Lower the pressure 3 Alarm Offset pressure sensor 20 20 mmWK Value pressure sensor at 4mA input 99 999 mmWK Value pressure sensor at 20mA input 99 999 mmWK 25 4 Decimal point choice 0 1 1 0 1 Per whole units 120 1 Per tenth units 10 Switching differential relay 1 1 0 150 0 mmWk 11 Offset relay 1 150 0 4150 0 mmWk 12 Switching differential relay 2 1 0 150 0 mmWK 13 Offset relay 2 150 0 4150 0 mmWK 14 Switching differential relay 3 1 0 150 0 mmWK 15 Offset relay 3 150 0 4150 0 mmWK 20 Minimum adjustable set point 99 999 mmWK 21 Maximum adjustable set point 99 999 mmWK Type alarm O No Alarm 1 Absolute 2 Relative Minimum alarm set point 99 999 mmWK Maximum alarm set point 99 999 mmWK Time delay minimum alarm 0 99 Minuten Time delay maximum alarm 0 99 Minuten Relay function alarm relay O Fail safe alarm 1 Control alarm Reset alarm relay when alarm OzNo 1 Yes recovers O No 1 Yes Reset alarm relay at manual reset Network number Software version Production year Production week Serial number x1000 Serial number units Calculation examples for pressure ranges 0 1 inchWK 0 2 inchWK 0 5 inchWK 0 10 inchWK 25 4 mmWKO 1 PSI 0 731 mmWK 50 8 mmWK 127 mmWK 0 0 0 0 254 mmWK Dimensions
3. User manual ALFANET 77 mmWK mmWK Pressostat OUT 1 NEN OUT 2 m ALARM ALFA 77 VDH doc 080646 Versie v1 0 Date 19 05 2008 Software ALFA NET 77mmWK File Do080646 WPD Range 99 999 mmWK Description The ALFANET 77 is a Pressostat with three relays functions and the possibility to control the differential pressure The ALFANET 77 mmWK read out and controlled on the PC Installation On the connection diagram from the ALFANET 77 mmWK is shown how the pressure sensor supply and the relays should be connected Control The ALFANET 77 mmWK Pressostat can be controlled by four pushbuttons on the front These buttons are SET viewing and changing the adjusted value UP raise the adjusted value DOWN lower the adjusted value mmWK hidden key under the mmWK text Viewing and or changing the set point By pushing the SET key the adjusted set point will be visible The most right dot starts also flashing indicating that the set point is shown Release the SET key By pushing the SET key again the set point can be changed with the UP or DOWN keys keep the SET key pushed A few seconds afters releasing the keys the measured value appears again on the display Relays status Push the mmWK key The three digits are indicating the status from the relays hereby O off and 1 on The code 110 means that relay 1 out 1 and relay 2 out 2 are on and relay 3 out 3 is off Adjusting internal parameters Beside
4. ing When the error is solved the error code disappears and the pressure is shown again Thealarm relay can be programmed with parameter P35 default on fail safe as a control alarm This means that the relay will be energized if an alarm occurs If the alarm relay is programmed as a fail safe relay than the relay is normally energized and will be de energized if an alarm occurs It also possible to make a choice between a relative and an absolute alarm A relative alarm is connected to the set point Technical data Type ALFANET 77mmWkK Pressostat Range 99 999 mmWK read out per 1 mmWK or per 0 1 mmWK Adjustable through the parameters Supply 12 Vac 16 5Vdc 5 10 Display 3 digit 7 segments display Relays The three relays have one common Communication RS 485 Ry 1 Out 1 Ry 2 Out 2 Ry 3 Out 3 Alarm SPST NO 250V 8A cos qo 1 SPST NO 250V 8A cos qo 1 SPDT NO NC 250V 8A cos o 1 2x twisted pair shielded cable min 0 75mm Control through pushbuttons on the front Front Polycarbonate IP65 Pressure sensor PX25 2 Supply 12Vdc Signal input 4 20mA Dimensions 85 x 77 x 71 5mm hwd Panel cut out 29 x 70mm hw Accuracy 0 5 96 from the range Provided with memory protection during power failure Special models available upon request Parameters ALFANET 77mmWK ar mescrigum emm Betis ong 1 2 3 0 0 Function relay 1 Function relay 2 Function relay
5. s the adjusting of the set point there are a few internal adjustments possible By pushing the DOWN key for more than 10 seconds the interne programming menu will be entered The upper and lower segment from the most left digit starts flashing Now the required parameter can be selected with the UP and DOWN keys see the table for the parameters When the required parameter has been selected it can be read out by pushing the SET key It can be changed with the UP en DOWN keys If no key is pushed for 20 seconds the ALFANET 77 mmWK will return to it s normal operating mode Adjusting pressure sensor The pressure sensor can be adjusted with the offset pressure sensor parameter 05 Indicates the sensor from the ALFANET 77 mmWK f i 2 mmWK to much than the offset pressure sensor should eb lowered with 2 mmWK Error codes On the display from the ALFANET 77 mmWK can appear the following error codes LO Minimum alarm HI Maximum alarm EE Adjustments are lost Solution EE Reprogram the adjustments Working Alarm If an error code or alarm occurs the buzzer if present will go on and an error code appears on the display The ALFANET 77 mmWK remembers the error code parameter P36 default on 0 even if the error is solved The error code can be reset with the SET key if parameter P37 is 1 If the error is not solved when the SET key reset alarm is pushed than the display shows the error code and the pressure alternat
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