User Manual ALFA(NET) 33 Min./Max. Alarm thermostat.
Contents
1. only at one side Shield to earth of the cable Optional RS485 SM811 NETWORK Temp 2 twisted pair sensor shielded Place Pullup down resistors ov Network connections 4 Shield only at x Shield only at Only at one point in the S Pair 1 q a one side of onesideof Network May be provided in Connect A HI to A HI El e T thecable 5 T thecable the controller with jumpers oe B LO to B LO J S its l to Earth to Earth Or use ALFA 1 ee J Connect GND 0V to GND 0V ve EX S lt KDCOC HORST AIK SKDCOC KS PEL PTF Shield Pi jpa ocna hE Connect Shield to clean Earth Endpoint Network cable Connection Network 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 5 Pair 1 A B Pair 2 Gnd Max Cable lenath 1KM Pair 1 A B Pair 2 Gnd Note 1 AVOID LONG STUB CABLES No longer than 0 5M otherwise use a Repeater Address VDH Products BV Tel Produktieweg 1 Fax 9301 ZS Roden Email The Netherlands Internet 31 0 50 30 28 900 31 0 50 30 28 980 info vdhproducts nl www vdhproducts nl2. starts blinking A few seconds after releasing the keys the setpoint disappears and the measured temperature is shown in the display Changing setpoints Push the SET key together with the UP or DOWN key and the maximum alarm setpoint or minimum alarm setpoint appears in the display Release both keys Now push the SET key again and together with the UP or DOWN keys the setpoint can be changed A few seconds after releasing the keys the measured temperature shows again in the display Actions of the alarm functions This alarm thermostat has two adjustable alarms namely a minimum and a maximum alarm Whereby can be chosen from watch or control alarms Parameter 27 Watch Alarm The relay is normally activated and LED alarm is off At alarm the relay is deactivated and the LED alarm is lit This is also the case at power failure Control Alarm The relay is normally deactivated and the LED alarm is off At alarm the relay is activated and the LED alarm is lit Furthermore an alarm can be hold or reset automatically parameter 28 lf alarms are hold default the alarms must be confirmed by pressing the SET button Only when the alarm cause is solved and the alarm is confirmed the relay is set to its normal position lfalarms are not hold and the alarm cause is solved the alarm will automatically reset and the relay is set to its normal position Also an offset zone and the differential for each a
3. User Manual ALFA NET 33 Min Max Alarm thermostat setlow sethigh alarm CN C Cy ALFA 33 VDH doc 053810 Version v1 3 Date 19 06 2012 Software ALFA NET 33 File Do053810 wpd Range 50 50 C readout per 1 C Function The ALFA NET 33 is a digital alarm thermostat for panel mounting The thermostat watches the minimum and maximum temperature The ALFA NET 33 has one relay for both alarms The ALFANET 33 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 33 you can see how the sensor power supply and relay have to be connected After connecting the ALFA NET 33 to the power supply it takes a few seconds to show the measured temperature in the display The alarm relay is a multi functional combined minimum and maximum alarm at alarm the LED alarm is lit in the display Control The ALFA NET 33 alarm thermostat can be controlled by three pushbuttons on the front SET view change setpoints and reset of alarm 4 UP increase a value CY DOWN decrease a value Viewing setpoints Viewing setpoint of maximum alarm By pushing the SET key first and then the UP key together the maximum alarm setpoint appears in the display The led set high starts blinking Viewing setpoint of minimum alarm By pushing the SET key first and then the DOWN key together the maximum alarm setpoint appe ars in the display The led set low
4. arm Technical data Type ALFA NET 33 alarm thermostat Range 50 50 C readout per 1 C Supply 230 Vac 50 60Hz 1 1VA or else see product sticker Relay 1x SPDT contact Max 250V 16A C NO 8A C NC at cos phi 1 Communication RS 485 Network 2x twisted pair shielded only at ALFANET model Control thru pushbuttons on front Front Polycarbonate IP65 Sensor SM 811 2 wire PTC sensor 10000 at 25 C Dimensions 35 x 77 x 71 5mm hwd Panel cut out 28 x 70mm hw Provided with memory protection during power failure Connection with screw terminals on the backside Equipped with self test function and sensor failure detection Special version are available upon request Dimensions 60 69 5 Connection diagram ALFA NET REMARK To terminate RS485 Network Connect a 250 Ohm resistor between If applicable 3X series Line A and Line B at both cable ends Trafo 3VA 230 12Vac VDH art nr 350 010073 230Vac L dc 0V N dc V SUPPLY RELAY Vac Vdc OUTPUT see product SPDT sticker RS 485 NETWORK CONNECTIONS 2 twisted pair shielded cable One of the Controllers can be the PC Interface Repeater is also a contr 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
5. ed see the parameter table If the required parameter is selected the value can be read out by pushing the SET key Pushing the UP or DOWN keys allows you to change the value of this parameter If no key is pushed for 20 seconds the ALFA NET 33 changes to it s normal operation mode Parameters ALFA NET 33 PARA DESCRIPTION PARAMETER RANGE DEFAULT METER VALUE 02 Minimum setpoint 50 50 C 50 03 Maximum setpoint 50 50 C 50 04 Offset temperature sensor sensor calibration 15 15 C 0 i 10 Startup delay after power failure 0 99 Minutes 11 Relay on at sensor failure 0 No 1 Yes Differential maximum alarm Differential minimum alarm Time delay maximum alarm Time delay minimum alarm Offset maximum alarm Offset minimum alarm 1 1 0 0 99 Minutes 0 20 C 20 0 C Relay alarm function O watchdog alarm 1 regulated alarm Auto reset alarm after temp recovering O hold alarm 1 don t hold alarm 0 1 0 No 1 Yes O OA ZOO mD c r Ce O OO0OO0OO O O 90 Network number only at ALFANET 1 250 95 Software version 0 255 96 Production year 00 99 97 Production week 1 52 98 Serial number x1000 0 255 99 Serial number units Function diagram Minimum Alarm L Maximum Alarm H l l Meassured Diff max lt q p gt Value alarm l Offset min alarm Offset max alarm Setpoint Setpoint Minimum Maximum Alarm Al
6. larm can be set See the function diagram Furthermore a delay time Parameter 23 and 24 for each alarm can be set during the delay time the led alarm flashes If after ending the delay time the alarm is still present an alarm is given and the relay is set into the alarm position If the temperature is recovered within the delay time than there will be no alarm In the display is continuously shown H at maximum alarm and L at minimum alarm Once the alarms are confirmed the measured temperature is shown again alternating with any outstanding actual alarm indications Sensor adjustment The sensor can be adjusted by using the Sensor Offset parameter 04 Indicates the ALFA NET 33 e g 2 C too much the Sensor Offset has to de decreased by 2 C Error messages In the display of the ALFA NET 33 the following error messages can appear Er Sensor broken Solution Check if the sensor is connected correctly Check the sensor 1000Q at 25 C Replace the sensor EE Settings are lost Solution Re programme the settings Setting internal parameters Next to the adjustment of the setpoints some internal settings are possible like differentials sensor offset setpoint range 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 select
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