User manual ALFA 71 spec. Thermostat.
Contents
1. Relays Ry1 SPST NO 250V 8A cos 1 of 250V 5A cos o 0 4 Ry2 SPST NO 250V 8A cos o 1 of 250V 5A cos Q 0 4 Ry3 SPDT NO NC 250V 8A cos 1 of 250V 5A cos o 0 4 Relays have one common C Control Through push buttons on the front Front Polycarbonate IP65 Sensor SM 811 2m PTC 10000 25 C Analogue output 0 10Vdc measure output Dimensions 35 x 77 x 71 5mm hwd Panel cut out 28 x 70mm hw Accuracy 0 590 from the range Provided with memory protection during power failure Connections with screw terminals on the back side Equipped with sensor failure detection Special versions on request available Parameters ALFA 71 spec Para Description Parameter Range Default eter value Function Relay 1 Function Relay 2 Function Relay 3 Offset temperature sensor 1 Analogue output OV at temperature Analogue output 10V at temperature Switching stage 2 on Switching stage 3 on Switch on delay stage 2 Switch on delay stage 3 Switching differential relay 1 Offset relay 1 Switching differential relay 2 Offset relay 2 Switching differential relay 3 Offset relay 3 Switch on delay cooling Switch off delay cooling Parameter 20 21 in sec of min Minimum Minimum on time cooling off time cooling Minimum adjustable set point Maximum adjustable set point Read out above 10 C on whole degrees Type Alarm Minimum alarm set point Maximum alarm set point Time delay2. Temp sens SM811 RELAY SUPPLY OUTPUT OUTPUTS 12Vac 0 10Vdc Tel 31 0 50 30 28 900 Fax 31 0 50 30 28 980 Email info vdhproducts nl Internet www vdhproducts nl
3. User manual ALFA 71 spec CC Thermostat SET a ALFA 71 VDH doc 080882 Version v1 0 Date 13 06 2008 Software ALFA71S1 File Do080882 WPD Range 50 50 0 C Installation On the upperside of the ALFA 71 spec is shown how the sensor supply relays and the analogue output have to be connected After power up a self test is started After this self test is completed the ALFA 71 spec will show the measured temperature Control The ALFA 71 spec thermostat can de controlled by four push buttons on the front SET viewing changing the adjusted value and reset alarm UP raise the adjusted value DOWN lower the adjusted value C hidden key above the SET key Viewing the set point By pushing the SET key the adjusted set point will be shown A few seconds after releasing the SET key the measured value will be shown again Changing the set point Push the SET key so the set point will appear on the display Release the SET key By pushing the SET key again simultaneously with the UP or DOWN key the adjusted set point can be changed A few seconds after releasing the keys the measured value will be shown again Status from the Relays By pushing the C key the display shows the status of the relays Each digit shows the status of one relay output showing O off and 1 on The code 110 means relay 1 and 2 are on and relay 3 is off Adjusting internal parameters Next to the adjustment of the set point in
4. minimum alarm Time delay maximum alarm Relay function alarm relay Reset alarm relay after recovering alarm Reset alarm relay after manual reset Control delay after power failure Forced relay function at sensor failure Software version Production year Production week Serial number x1000 Serial number units 1 Cooling 2 Heating 3 Alarm 1 Cooling 2 Heating 3 Alarm 1 Cooling 2 Heating 3 Alarm 15 0 15 0 C 50 50 C 50 50 C 0 Temperature 1 Time 0 Temperature 1 Time 0 99 min 0 99 min 0 1 15 0 15 4 15 0 1 15 0 15 4 15 0 1 15 0 15 4 15 4599 99 seconds 99 min 0 0 0 1 minutes 0 0 99 min 50 0 50 0 C 50 0 50 0 C 0 No Yes Non Absolute Relative 50 0 50 0 C 50 0 50 0 C 99 min 0 99 min fail safe alarm control alarm No Yes No Yes 99 min Non Cooling Heating Dimensions connections Address VDH Products BV Produktieweg 1 9301 ZR Roden The Netherlands SSN Sega MIEN N m TN ALFA 71 spec al al Has E cl Sl sis i c oj Of ol o i els Z ol El sl ee oj Of El De E 1 1 Ge olal S El yu ol mo gt gt KE T o 3 2 2 2 2 SIs p Qa
5. ternal settings can be made like differential sensor offset set point 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 Over 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 key to change the value of this parameter If 20 seconds no key is pushed the ALFA 71 spec changes to the normal operation mode Adjusting the sensor The sensor can be adjusted by using the Sensor Offset parameter 05 Indicates a Sensor e g 2 C to much the according Sensor Offset has to be decreased with 2 C Error codes On the display from the ALFA 71 spec can appear the following error codes LO Minimum alarm HI Maximum alarm E1 Sensor failure Solution Check if the sensor is connected well Check the sensor 10000 25 C Replace the sensor EEE Adjustments are lost Solution Reprogram the adjustments Working Alarm If an error code occurs it can be reset with the SET key The function from this key depends on parameter P37 Technical details Type ALFA 71 spec Thermostat Range 50 50 0 C above 10 C read out per 0 1 C Supply 12Vac 50 60Hz 5 10 Read out 3 digit 7 segments display Status Led LED SET
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