User manual ALFA 71 MODulation Thermostat. 0
Contents
1. User manual ALFA 71 MODulation rere gc Thermostat Ww SET 0 100 C SARE ALFA 71 VDH doc 080349 Version v1 0 Date 07 03 2008 Software ALFA71MOD100 File DO080349 WPD Range 0 100 0 C Installation On the top side of the ALFA 71 MOD is shown how the sensors power supply and relays has to be connected After connecting the ALFA 71 MOD to the power supply a self test function is started As this test is finished the measured temperature appears in the display Control The ALFA 71 MOD 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 Ke hidden push button above the SET key and behind C symbol Viewing set point By pushing the SET key the set point 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 set point Push the SET key and the set point 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 Status of the Relays By pushing the hidden C key the display shows the status of the relays Each display segment shows the status of the relay output showing O of2. 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 details Type ALFA 71 MOD Thermostat Range 0 100 0 C per 0 1 C Supply 12Vac 50 60Hz 5 10 Display 3 digit 7 segment display Relays Ry1 Open SPST NO 250V 8A cos 1 of 250V 5A cos 0 4 Ry2 Close SPST NO 250V 8A cos 1 of 250V 5A cos 0 4 Ry3 Alarm SPDT NO NC 250V 8A cos 1 of 250V 5A cos o 0 4 Relays have one common C Control By push buttons on front Front Polycarbonate IP65 Sensor SM 811 2m PTC 10000 25 C Analog output 0 10 Vdc PI output cool or heat Dimensions 35 x 77 x 71 5mm HWD Panel cutout 28 x 70mm HW 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 on request available Parameters ALFA 71 MOD Para Description Parameter Range Default meter el 10 Offset temperature sensor 1 15 0 15 0 C P band I time Runtime valve Reset time Reset to minimum or maximum valve position Minimum set point Maximum set point Read out above 10 C per 1 C Alarm type M
3. f and 1 o0n The code 110 means relay 1 and 2 are on and relay 3 is off Readout valve position By pushing the UP key the display shows the current valve position 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 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 after 20 seconds no key is pushed the ALFA 71 MOD changes to the normal operation mode Adjustment sensors The temperature sensor can be adjusted by using the Sensor Offset parameter 05 Indicates the Sensor e g 2 C to much the Sensor Offset has to be decreased with 2 C Error messages In the display of the ALFA 71 MOD the following error messages can appear LO Minimum alarm Solution E1 HI Maximum alarm Check if the sensor is connected correctly E1 Sensor 1 failure Check sensor 1000Q at 25 C Replace sensor EEE Settings are lost Solution EEE Reprogram the settings L ln case of sensor short circuit the display alternates between error code E and L
4. inimum alarm set point Maximum alarm set point Time delay minimum alarm Time delay maximum alarm Relay function alarm relay Reset alarm relay after recovering alarm Reset alarm relay after manual reset Start up delay after power failure Forced relay function at sensor failure Software version Production year Production week Serial number x1000 Serial number units Function thermostat 1 Cool 1 2 Heat 5 0 0 0 15 0 C 0 99 Minutes 0 0 999 Seconds 0 999 Minutes 60 0 mimimum 1 maximum 0 0 100 0 0 0 100 0 0 no 1 yes None Absolute Relative 0 100 0 C 0 100 0 C 99 min 99 min 0 Watch alarm 1 Control alarm 0 No 1 Yes Yes 99 Minutes None Dimensions 77 N alla SE P a tO RIII 69 5 H Connections ALFA 71 MOD Trafo 3VA 230 12Vac G ea HES art nr 350 010073 RA 2 L N 230Vac 12Vac a el ira or gt D SI e ZI el 2 o o 2 D E Al al ol da SIS S typ S ZI SI AI amp SI SI E S Z GU Er T Z i Ry2 CLOSE Ry3 ALARM RELAY SUPPLY 2x SM811 OUTPUTS 12Vac Temp sens 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 Nether
5. lands Internet www vdhproducts nl
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