VDH ALFA 72-VS User Manual
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3* Adjustment sensors.Sensor-1 can be adjusted by using the Sensor Offset parameter 05 and Sensor-2 can be adjusted byusing the Sensor Offset parameter 06. Indicates a Sensor e.g. 2C to much, the according SensorOffset has to be decreased with 2C.* Error messages.On the display of the ALFA 52-VS the following error messages can appear:E1 - Sensor-1 failure.E2 - Sensor-2 failure. Solution EEE:EEE - Settings are lost. - Reprogram the settings.Reset Alarm. When an error-messages appears it can be reset by pushing the SET key. Thefunction of this key depends on parameter P42.After reset alarm the differential temperature appears again in the display or the error-code E..alternates with extra indications as the temperature is out of measure range. These indications are;‘L’ indicates a short-circuit sensor.‘H’ indicates a open-circuit sensor.Whereby the first segment is used to indicate these codes for Sensor-1 the second segment shows‘-‘ and the last segment indicates the codes for Sensor-2.F.i.; L - - Indicates a short circuit of Sensor-1 and Sensor-2 okay- - H Indicates a open-circuit of Sensor-2 and Sensor-1 okayH - L Indicates Sensor-1 with a open-circuit and Sensor-2 with a short-circuit* Technical data ALFA 72-VS.Type : ALFA 72-VS Differential thermostatRange : Differential temperature in display: 0/+20C (0,1)Stactic range : -50/+50,0C, above -10C read-out in 0,1C or(See sticker) -20/+80,0C, above -10C read-out in 0,1C or0/+100,0C read-out in 0,1CSupply : 12Vac 50/60Hz (-5/+10%) or else see product stickerRead-out : 3-digit 7-segments displayRelays : Ry1= SPST(NO) 250V/8A(cos =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 the front.Front : PolycarbonateSensor : 2x SM 811/2m (PTC 1000/25C).Dimensions : 90 x 71 x 58mm (hwd)Panel cut out : 46 x 71mm (HW) at panel mountAccuracy : ± 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. |
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