User manual ALFA(NET) 51 PI Rail-Thermostat.
Contents
1. o Yes o Yes Reset alarm relay after recovering alarm Reset alarm relay after manual reset Start up delay after power failure 99 Minutes Forced relay function at sensor failure one Cool Heat Network number Software version Production year Production week Serial number x1000 Serial number units Dimensions Connections gt E e 000000000000 T SA N Mewe N a i m U L 1 1 1 r O M gt N gt a gt LO o GOs ao TP PT 3mo v3 dd NAL o foro 000000000000 NC RY3 GOGOL LOOO B IS a el ra LITTI TIT Titi SEES a a 0UT 1 0UT 2 ALARM ser 0 a rons L VDH ALFA 51 VOVDOVOOOVWWOO IE Sos E ES g e 2 ko MA a D t E LU S ST En Address VDH Products BV Tel 31 0 50 30 28 900 Produktieweg 1 Fax 31 0 50 30 28 980 9301 ZS Roden Email info vdhproducts nl The Netherlands Internet www vdhproducts nl2. 58mm HWD Panel cut out 46 x 71mm HW for front mounting Accuracy 0 5 of the range Provided with memory protection during power failure Connections with screw terminals on the back side Equipped with sensor failure detection Special versions are on request available Parameters ALFA NET 51 PI Function Relay 1 Function Relay 2 Function Relay 3 Function PI output Offset temperature sensor sO tL 52 0 E Offset PI zone Oo el SAO Re P band setting 0 20 0 C I time setting 99 minutes Switch on relay 2 by Temperature Time Temperature Time Switch on delay relay 2 99 Minutes Switch on delay relay 3 99 Minutes Switching differential relay 1 ods o 40 6 Setpoint offset relay 1 E SAO Switching differential relay 2 Lo sT5 G E Setpoint offset relay 2 Piers SN O Switching differential relay 3 H ESA O E Setpoint offset relay 3 dl SO Switch on relay 3 by 3 Switch on delay cooling 2299 Switch off delay cooling no 99 Parameter 20 21 in Sec or Min Seconds Minutes Minimum on time cooling 99 Minutes Minimum off time cooling 99 Minutes Minimum set point Maximum set point Read out per 1 C Alarm type to setpoint None Absolute Relative Minimum alarm setpoint 02 4450 0 C Maximum alarm setpoint 042 4900 C Time delay minimum alarm 0 99 Minutes Time delay maximum alarm 0 99 Minutes Relay function alarm relay Watch Control
3. OWN key together the individual sensors can be shown in the display After releasing the keys the measured temperature of sensor 1 can be shown by pushing the UP key or the measured temperature of sensor 2 can be shown by pushing the DOWN key A few seconds after releasing the keys the average temperature shows again in the display Status of the Relays By pushing the MODE key the display shows the status of the relays Each display segment shows the status of the relay output showing O off and 1 on The code 110 means relay 1 and 2 are on and relay 3 is off Setting internal parameters Next to the adjustment of the setpoint internal settings can be made like differential sensor offset setpoint range and the functions of the thermostat Push the DOWN key for more than 10 seconds to 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 key to change the value of this parameter If after 20 seconds no key is pushed the ALFA NET 51 PI changes to the normal operation mode Adjustment sensors Sensor 1 can be adjusted by using the Sensor Offset parameter 06 and Sensor 2 can be adjusted by using the Sensor Offset parameter 07 Indicates a Sensor e g 2 C to much the according Sensor Of
4. User manual ALFA NET 51 PI Rail Thermostat 0UT 1 0UT 2 ALARM RL VDH ALFA 51 VDH doc 070031 Version v1 0 Date 27 09 2007 Software ALFANET51 PI File Do070031 WPD Range 50 50 0 C Installation On the connection diagram of the ALFA NET 51 Pl is shown how the sensors analogue output power supply and relays are to be connected After connecting the ALFA NET 51 PI to the power supply a self test function is started As this test is finished the measured temperature appears in the display The ALFANET 51 Plis by use of the ALFANET PC INTERFACE controllable on the PC Control The ALFA NET 51 PI thermostat can be controlled by four pushbuttons on the front These keys are SET view change the setpoint UP increase the setpoint DOWN decrease the setpoint MODE relay status key Viewing setpoint By pushing the SET key the setpoint appears in the display The decimal point of the last display starts blinking A few seconds after releasing the SET key the setpoint disappears and the measured temperature is shown again in the display Changing setpoint Push the SET key and the setpoint appears in the display Release the SET key Now push the SET key again together with the UP or DOWN keys to change the setpoint A few seconds after releasing the keys the measured temperature shows again in the display Viewing the individual sensors By pressing the UP and D
5. fset has to be decreased by 2 C Error messages In the display of the ALFA NET 51 PI the following error messages can appear LO Minimum alarm Solution E1 E2 HI Maximum alarm Check if the sensor is connected correctly El Sensor 1 failure Check sensor 10000 at 25 C E2 Sensor 2 failure Replace sensor EEE Settings are lost Solution EEE Reprogram the settings L In case of sensor short circuit the display alternates between error code E and L as indication for a short circuit sensor H In case of open circuit sensor the display alternates between error code E and H as indication for a open circuit sensor Reset Alarm When a error messages appears it can be resetted by pushing the SET key The function of this key depends on parameter P37 Technical data Type ALFA NET 51 PI rail thermostat Range 50 50 0 C display per 0 1 C Supply 12Vac 50 60Hz 5 10 Display 3 digit 7 segment display Relays Ry1 SPST NO 250V 8A cos d 1 of 250V 5A cos 0 4 Ry2 SPST NO 250V 8A cos 1 of 250V 5A cos 0 4 Ry3 SPDT NO NC 250V 8A cos 1 of 250V 5A cos 0 4 Relays have one common C Control By push buttons on front Front Polycarbonate IP65 Sensors 2x SM 811 2m PTC 10000 25 C Analogue output 0 10Vdc PI output Rload min 10KOhm Communication RS485 Network 2x twisted pair shielded cable min 0 75mmY Dimensions 90 x 71 x
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