User Manual ALFA(NET) 33 DP -10/+90/C (0,1)
Contents
1. 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 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 Operation 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 set high is off At alarm the relay is deactivated and the LED set high is lit This is also the case at power failure Control Alarm The relay is normally deactivated and the LED set high is off At alarm the relay is activated and the LED set high 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 solv2. Description Parameter Range Standard meter Value 02 Minimum setpoint setting 10 0 90 0 C 03 Maximum setpoint setting 10 0 90 0 C 04 Offset temperature sensor sensor adjustment 15 0 15 0 C 10 Startup delay after power failure 0 99 Minutes 0 11 Relay on at sensor failure 0 No 1 Yes 0 21 Differential maximum alarm 0 1 15 0 C 1 0 22 Differential minimum alarm 0 1 15 0 C 1 0 23 Time delay maximum alarm 0 99 Minutes 0 24 Time delay minimum alarm 0 99 Minutes 0 25 Offset maximum alarm 10 0 10 0 C 0 0 26 Offset minimum alarm 10 0 10 0 C 0 0 2 Relay alarm function 0 1 0 O watch alarm 1 control alarm 28 Auto reset alarm after temperature recovering 0 No 1 Yes 0 O hold alarm 1 don t hold alarm 29 Reset alarm after manual conformation 0 No 1 Yes 0 despite the alarm situation is not solved 90 Network number only at ALFANET 95 Software version 96 Production year 97 Production week 98 Serial number x1000 99 Serial number units Function diagram Minimum Alarm L Maximum Alarm H l I Meassured Diff max lt q p Value alarm l Offset min Offset max alarm Setpoint Setpoint alarm Minimum Maximum Alarm Alarm Technical data Type ALFA 33 DP alarm thermostat ALFANET 33 DP alarm thermostat with network Range 10 90 C readout per 0 1 C Supply 230 Vac 3VA 50 60Hz or else see product sticker Relay 1x SPDT contact Max 250V
3. 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 nl
4. 16A C NO 8A C NC cos phi 1 Communication RS 485 Network 2xtwisted pair shielded at ALFANET model Control By pushbuttons on front Front Polycarbonate IP65 Sensor SM 811 2 wire PTC sensor 10000 at 25 C Dimensions 35x 77x 71 5mm hwd Panel cut out 28x 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 versions 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 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
5. User Manual ALFA NET 33 DP 10 90 C 0 1 Minimum Maximum Alarm Thermostat set high C ALFA 33DP VDH doc 120548 Version v1 0 Date 29 05 2012 Software 0726443 ALFA 13 23 33 DP2 F File Do120548 wpd Range 10 90 C readout per 0 1 C Function The ALFA NET 33 DP is a digital alarm thermostat for panel mounting The temperature is readout in tents of degrees Celsius The thermostat watches the minimum and maximum temperature To report a alarm the ALFA NET 33 DP has one relay for both alarms The ALFANET 33 DP 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 DP you can see how the sensor power supply and relay have to be connected After the ALFA NET 13 DP is connected 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 set high is lit in the display Control The ALFA NET 33 DP alarm thermostat can be controlled by three pushbuttons on the front SET view change setpoints and reset of alarm Wa 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
6. ed the alarm will automatically reset and the relay is set to its normal position Also an offset zone and the differential for each alarm 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 set high 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 With parameter 29 set to 1 Yes the relay of the controller can be set to its normal position by confirming the alarm although the alarm is not being solved Then the led set high is switched off the relay is set to its normal position and the display starts showing the measured temperature again alternated with the outstanding alarm indications Sensor Fault Detection If a sensor fault is detected there is error message Er in the display and the relay works according to the setting of parameter 11 The error remains in the display until it is manually confirmed by pressing the SET key Once the sensor fault is confirmed by the measured temperature is displayed alternating with any outstanding actual error After the sensor
7. fault is solved the relay works again according to setting of parameter 27 as the sensor fault is shall be confirmed by hand or an alarm is detected In most situations it will be logical to set Parameter 11 and 27 to the same value Sensor adjustment The sensor can be adjusted by using the Sensor Offset parameter 04 Indicates the ALFA NET 33 DP e g 0 2 C too much the Sensor Offset has to de decreased by 0 2 C Error messages In the display of the ALFA NET 33 DP the following error messages can appear Er Sensor broken Solution Check if the sensor is connected correctly Check the sensor 10000 at 25 C Replace the sensor EE Settings are lost Solution Settings must be reprogrammed Setting internal parameters Next to the adjustment of the setpoint some internal settings are possible like differential 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 selected 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 DP changes to it s normal operation mode Parameters ALFA NET 33 DP Para
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