User manual ALFA(NET) 37 BAR
Contents
1. ALFA NET 3 series 7 5 60 L dc 0V N dc V Common c SUPPLY Optional Vac Vdc RELAY see product OUTPUT sticker SPDT RS 485 NETWORK CONNECTIONS 2 twisted pair shielded cable One of the Controllers can be the PC Interface Repeater is also a contr e lt E lt gt lt SC gt oea lt S lt SC Po HIxXIKS lt pi lt S lt KSCPLeI XIX S Place Terminator resistor of 250 Ohm only at both ee ends of the RS485 cable between line A and line B May be provided in the controller with a jumper For signal conditioning Q2 gt Cx2L CLT MCX gt lt SC gt o eo DSL gt CXxI lt LDLL gt LSIxID REMARK To terminate RS485 Network Connect a 250 Ohm resistor between Line A and Line B at both cable ends only at one side Shield to earth of the cable Input RS485 NETWORK 4 20mA 2 twisted pair Pressure Optional shielded sensor V Place Pullup down resistors gt ov Network connections Bej Shield only at Shield only at only at one point in the S Pair 1 lt q 2 O one side of onesideof Network May be provided in S Sones A HI j A LA S g the cable T thecable the controller with jumpers Q Paina LO to B LO to Earth to Earth Oruse ALFA 1 TERMINATOR O l Connect GND 0V to GND 0V Shield Connect Shield to clean Earth Endpoint Network cable Connection Network2. Error messages On the display from the ALFA NET 37 can appear the following error messages LO Minimum alarm HI Maximum alarm EE Settings are lost Solution Reprogram the settings Working Alarm lf there appears a error message or alarm the buzzer switches on if present and an error message appears on the display The ALFA NET 37 remembers the error message parameter P36 default on 0 even if the error is already solved The error message can be reset through the SET key if parameter P37 is 1 If the SET key reset alarm is pushed and the alarm is not solved the ALFA NET 37 shows alternate the pressure temperature and the error message If the alarm is solved than the error message disappears and the pressure temperature will be shown The alarm function can be changed with parameter P35 default is fail safe to control alarm This means that if an alarm occurs the relay will be energized When a fail safe alarm is active the relay will be de energized With parameter P30 it is possible to make a choice between no alarm absolute or relative alarm A relative alarm is related to the set point Technical data Type ALFA NET 37 Pressostat Range 1 0 99 9 BAR read out per 0 1 BAR If an coolant is chosen it is also possible to read out the temperature with a maximum range of 60 0 till 60 0 C Supply 230 Vac 50 60Hz 5 10 or else see product sticker Relay Potential free contact SPDT C NO
3. NC 250V 8A cos 1 Communication RS 485 network 2x Twisted pair shielded cable min 0 5mm Pressure sensor PX25 PX75 PX77 series External supply 11 33Vdc Signal input 4 20mA Only for relative pressure sensors Not for absolute pressure sensors Display 3 digit 7 segments display Control Through push buttons on the front Front Polycarbonate Dimensions 35 x 77 x 71 5mm hwd Panel cut out 29 x 70mm hw Accuracy 0 5 from the range Provided with memory protection during power failure Connection with screw terminals on the back side Special version on request available Setting internal parameters Next to the adjustment of the setpoint some internal settings are possible like differential sensor offset set point range coolant choice read out and control settings and alarm settings 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 With 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 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 37 changes to it s normal operation mode Parameters ALFA NET 37 Para Description Parameter Range Default meter va
4. cable Endpoint only on one side of cable Network 2 twised pair shielded point 2 twised pair shielded Network min 0 5mm Network min 0 5mm Pair 1 A B Pair 2 Gnd Max Cable length depends on speed Pair 1 A B Pair 2 Gnd Note 1 AVOID LONG STUB CABLES No longer than 0 5M otherwise use a Repeater Adress VDH Products BV Produktieweg 1 9301 ZS Roden Netherlands Tel 31 0 50 30 28 900 Fax 31 0 50 30 28 980 Email info vdhproducts nl Internet www vdhproducts nl
5. the read out changes from pressure to temperature and reverse several parameters becomes other units These parameters are marked with It will be wise to check the value of all parameters as soon as the read out and control changes 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 value 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 measured value shows again in the display Status from the Relay The most upper left point with the text on indicates the status of the relay If this one is on the relay is energized except if the relay is programmed as a fail safe alarm In this case the relay is normally energized and the led is off and as soon as an alarm occurs the led will light in and the relay will de energized Adjusting the pressure sensor First the range of the pressure sensor must be set with parameter 06 4mA value and parameter 07 20mA value The pressure sensor can be adjusted with the Offset pressure sensor parameter 05 Indicates the sensor from the ALFA NET 37 e g 0 2 BAR to much than the Offset pressure sensor should be decreased with 0 2 BAR
6. User manual ALFA NET 37 BAR 4 20mA Pressostat with temperature read out and controlling on base ALFA 37 of several coolants VDH doc 071744 Version v1 1 Date 24 03 2010 Software 071508 A N 1 7 27 37 BAR File Do071744 wpd Range 1 0 99 9 BAR per 0 1 BAR Description The ALFA NET 37 is a Pressostat with three relays functions and the possibility to control on pressure or temperature from several coolants The ALFANET 37 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 37 you can see how the sensor power supply and relay have to be connected After connecting the ALFA NET 37 to the power supply a self test function is started As this test is finished the measured pressure or temperature appears in the display Control The ALFA NET 31 thermostat can be controlled by three pushbuttons on the front These keys are SET view change the set point UP increase the set point DOWN decrease the set point Read out and controlling on Temperature The ALFA NET 37 pressostat controls normally on atmospheric pressure no absolute pressure If a coolant is chosen with parameter P08 it is also possible to read out and control on temperature This can be adjusted with parameter P09 The indication for temperature read out is shown by the most right point top in the display There is a C sign at this point If
7. lue 7 01 Function relay 0 3 1 0 Non 1 Increase pressure temperature 2 Decrease pressure temperature 3 Alarm 06 Value pressure sensor at 4mA input 1 0 99 9 Bar 1 0 07 Value pressure sensor at 20mA input 1 0 99 9 Bar 99 9 08 Coolant choice 0 10 0 O non 6 R407A BP 1 R22 7 R407C DP 2 R134A 8 R407C BP 3 R404A DP 9 R717 NH3 4 R404A BP 10 R507 5 R407A DP DP Dewpoint BP Bubblepoint 09 Read out and control choice 0 2 0 O Pressure Bar 1 Temp Per 0 1 C requires coolant choice 2 Temp Per 1 C requires coolant choice Switching differential relay 0 1 15 0 Bar C 0 5 Switching offset relay 15 415 0 Bar C 0 0 i Type of alarm 05 Offset pressure sensor 15 0 15 0 Bar 0 0 0 None 1 Absolute 2 Relative Minimum alarm set point 99 99 9 Bar C Maximum alarm set point 99 99 9 Bar C 0 99 Minutes 0 99 Minutes 0 Fail safe alarm 1 Control alarm O No 1 Yes O No 1 Yes Time delay minimum alarm Time delay maximum alarm Relay function alarm relay Reset alarm relay if alarm disappears Reset alarm relay at manual reset Network number 95 Software version 96 Production year 97 Production week 98 Serial number x1000 99 Serial number units Changes when changing from Bar to C or to another coolant P09 or P08 Unit changes when changing from Bar to C P09 Connections Dimensions
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