VDH ALFA(NET) 52 User Manual
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2* Status of the Relays.By pushing the MODE key the display shows the status of the relays. Each display segment showsthe status of the relay output, showing 0=off and 1=on. The code 110 means relay 1 and 2 are onand relay 3 is off.* Setting internal parameters.Next to the adjustment of the set point, internal settings can be made like differential, sensor offset,set point range and the functions of the thermostat.Push the DOWN key more than 10 seconds, to enter the 'Internal Programming Menu'. In the leftdisplay the upper and lower segment are blinking. Over the UP and DOWN keys the requiredparameter 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. Pushingthe UP or DOWN key to change the value of this parameter.If after 20 seconds no key is pushed, the ALFA(NET) 52 changes to the normal operation mode.* Adjustment sensors.Sensor-1 can be adjusted by using the Sensor Offset parameter 05 and Sensor-2 can be adjustedby using the Sensor Offset parameter 06. Indicates a Sensor e.g. 2C to much, the accordingSensor Offset has to be decreased with 2C.* Error messages.In the display of the ALFA(NET) 52 the following error messages can appear:Lo1 - Minimum alarm thermostat-1. Solution E1,E2:Hi1 - Maximum alarm thermostat-1. - Check if the sensor is connected correctly.Lo2 - Minimum alarm thermostat-2. - Check sensor (1000 at 25C).Hi2 - Maximum alarm thermostat-2. - Replace sensor.E1 - Sensor-1 failure.E2 - Sensor-2 failure. Solution EEE:EEE - Settings are lost. - 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 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 an error-messages appears it can be reset by pushing the SET key. Thefunction of this key depends on parameter P42.* Technical data ALFA(NET) 52.Type : ALFA(NET) 52 Double thermostat (Rail-mounting)Range : 0/+100C per 0,1CSupply : 230Vac 50/60Hz (-5/+10%)Readout : 3-digit 7-segment displayRelays : Ry1= SPST(NO) 250V/8A(cos =1) or 250V/5A (cos =0.4)Ry2= SPST(NO) 250V/8A (cos =1) or 250V/5A (cos =0.4)Ry3= SPDT(NO/NC) 250V/8A (cos =1) or 250V/5A (cos =0.4)Relays have one common (C).Control : By push buttons on front.Front : PolycarbonateSensors : 2x SM 811/2m (PTC 1000/25C).Communication : RS 485 Network (2xtwisted pair shielded) only at ALFANET model.Dimensions : 90 x 71 x 58mm (HWD)Panel cutout : 46 x 71mm (HW) at front mountingAccuracy : ± 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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