User manual ALFA 71 PI Spec. Thermostat.
Contents
1. nnn nnn nn nnn nnn nnn npn nnn nnn nnn nnn nn nnn nnn nn e Duty Cycle fOcees 252252S2asseesz2e r5 ee M 72 Duty Cycle m PEENE EEE r EEEE NEEE ET 400 5 tov j 5 10v p 2 Solid State output Solid State output 6 w 7 6 w h i eee SEEEN EE ET ee EASE CEES SR CP wy Pia Ae ee O aon Li Tana ancien AASS Beene Le Proportional band gt Temp p Proportional band gt Temp Setpoint offset PI function zone Setpoint offset PI function zone M Setpoint Setpoint Parameters ALFA 71 PI SPEC Para Description Parameter Range Default meter 1 3 1 Function Relay 1 1 Cool 2 Heat 3 Alarm Function Relay 2 same as relay 1 Function aoa 3 same as relay 1 Function Solid State Pl output 0 10V 1 Cool on off Cool Pl mod Heat on off Heat Pl mod Function sensor 2 non control Offset temperature sensor 1 Offset temperature sensor 2 Switch on relay 2 by 0 Temperature 1 Time Switch on relay 3 by 0 Temperature 1 Time Switch on delay relay 2 Switch on delay ea 3 Switching differential relay 1 Set point offset relay 1 Switching differential relay 2 Set point offset relay 2 Switching differential relay 3 Set point offset relay 3 Switching differential solid state P Set point offset solid state P Switch on delay cooling Switch off delay cooling P2. 69 5 65 ar C o ALFA 71 spec RELAY OUTPUTS Tel Fax Email Internet 12Vac inp 12Vac inp Common OV Temp sens SM811 SUPPLY OUTPUT 12Vac 0 10Vdc 31 0 50 30 28 900 31 0 50 30 28 980 info vdhproducts nl www vdhproducts nl
3. User manual ALFA 71 PI Spec m a 0C Thermostat ps With solid state output ALFA 71 VDH doc 080348 Version v1 1 Date 08 10 2010 Software 042779 ALFA71WA File Do080348 wpd Range 50 50 0 C Installation On the top side of the ALFA 71 PI SPEC is shown how the sensors power supply relays and 0 10Vdc Solid State output has to be connected After connecting the ALFA 71 PI SPEC 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 PI SPEC 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 C hidden push button above the SET key and behind C symbol 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 Status of the Relays By pushing the hidden C key the display shows the status of the relays Each display segmen
4. arameter 22 23 in Sec or Min 0 Seconds 1 Minutes Minimum on time cooling Minimum off time cooling Minimum set point Maximum set point g Read out above 10 C per 1 C Alarm type 0 None 1 Absolute 2 Relative Minimum alarm set point Maximum alarm set point Time delay minimum alarm Time delay maximum alarm Function alarm relay 0 Fail safe alarm 1 Control alarm Reset alarm relay after recovering alarm Reset alarm relay after manual reset Start up delay after power failure Forced relay function at sensor failure 0 None 1 Cool 2 Heat Setpoint offset PI function zone P band setting time setting Duty ee time adjustment PI off Above set point at heating and below set point at cooling 999 means off Software version Production year Production week Serial number x1000 Serial number units 0 2 15 0 15 0 15 0 15 0 QON00000 Minutes Minutes 50 0 50 0 50 0 50 0 0 No 1 Yes 50 0 50 0 Minutes Minutes Minutes 30 0 30 0 C 0 0 30 0 C 1 999 Seconds 1 999 Seconds 0 No 1 Yes Dimensions 77 C SET ALFA 3x Bae ae 35 28 6 5 12 60 Connections Trafo 3VA 230 12Vac O VDH art nr 350 010073 230Vac Address VDH Products BV Produktieweg 1 9301 ZS Roden The Netherlands
5. r 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 PI SPEC Thermostat with Solid State output Range 50 50 0 C above 10 C display per 0 1 C Supply 12Vac 50 60HZ 5 10 or else see product sticker Display 3 digit 7 segment display Relays Ry1 SPST NO 250V 8A cosd 1 of 250V 5A cos 0 4 Ry2 SPST NO 250V 8A cosd 1 of 250V 5A cos 0 4 Ry3 SPDT NO NC 250V 8A cosd 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 Solid State output Imax 10mA 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 Function diagram 5V gt p Function Heat Function Cool 25V H a A ns a ie Ae aaron area or eer H Internal P I D control voltage Internal P I D control voltage QV bao a a sce areca Co aera OV Fe
6. t shows the status of the relay output showing O off and 1 0n 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 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 PI SPEC changes to the normal operation mode Adjustment sensors The temperature sensor can be adjusted by using the Sensor Offset parameter 06 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 PI SPEC 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 In case of sensor short circuit the display alternates between error code E and L as indication for a short circuit senso
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