User manual ALFA 71 MODulation Thermostat.
Contents
1. 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. out above 10 C per 1 C Alarm type Minimum alarm setpoint Maximum alarm setpoint 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 Time correction at realtimeclock network Network number at network version Software version Production year Production week Serial number x1000 Serial number units 0 15 0 C 99 Minutes 999 Seconds 999 Minutes mimimum maximum 0 0 0 0 0 1 50 0 50 0 50 0 50 0 0 no 1 yes 0 None 1 Absolute 2 Relative 50 0 50 0 C 50 0 50 0 C 99 min 99 min Watch alarm Control alarm No 1 Yes No 1 Yes 99 Minutes None Min Max 99 99 Minutes 5 0 0 120 60 0 50 0 50 0 0 1 Dimensions 7 70 28 12 Z 6 5 60 65 i SS 555 ed Ld SS 69 5 Connections ALFA 71 MOD Trafo 3VA 230 12Vac VDH art nr 350 010073 D QO L N 230Vac 12Vac 5 AES S S 5 a fo N N a 2 gs Ee Ry1 0PEN Ry2 CLOSE Ry3 ALARM RELAY SUPPLY 2x SM811 OUTPUTS 12Vac Temp sens Address VDH Products BV Tel 31
3. User manual ALFA 71 MODulation ee es Thermostat me ALFA 71 VDH doc 052939 Version v1 0 Date 03 10 2005 Software ALFA71MOD File DO052939 WPD Range 50 50 0 C Installation On the top side of the ALFA 71 MOD is shown how the sensors power supply relays and 0 10Vdc PI output 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 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 segment shows the status of the relay output showing O off and 1
4. n 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 Range Supply Display Relays Control Front Sensor Analog output Dimensions Panel cutout Accuracy ALFA 71 MOD Thermostat 50 50 0 C above 10 C display per 0 1 C 12Vac 50 60Hz 5 10 3 digit 7 segment display 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 By push buttons on front Polycarbonate IP65 SM 811 2m PTC 10000 25 C 0 10 Vdc PI output cool or heat 35 x 77 x 71 5mm HWD 28 x 70mm HW 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 Description Parameter Default Function thermostat 1 Cool 1 2 Heat Offset temperature sensor 1 15 0 15 0 C oo P band I time Runtime valve Reset time Reset to minimum or maximum valve position Minimum setpoint Maximum setpoint Read
5. 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 In case of sensor short circuit the display alternates between error code E and L as indicatio
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