User manual ALFA(NET) 31 0-100OC Cool/Heat
Contents
1. Se de THe a om v gt oT oO gt poe soll Mice Ha O O w ge ge oor w w ca oo l O aa Tow lt v gt P a Noo Ly SUPPLY RELAY RS485 SM811 Vac OUTPUT NETWORK Temp Vdc SPDT optional sensor Tel 31 0 50 30 28 900 Fax 31 0 50 30 28 980 Email info vdhproducts nl Internet www vdhproducts nl2. 485 Network A B GND 3 wire shielded only at ALFANET 31 Control by pushbuttons on the front Front Polycarbonate IP65 Sensor SM 811 2m 1000Q at 25 C Sizes 35 x 77 x 71 5mm hwd Panel hole 28 x 70mm hw Provided with memory protection during power failure Connection with screw terminals on the back side Equipped with self test function and sensor failure detection Special versions are available upon request Parameters ALFA NET 31 Switching differential Minimum setpoint Maximum setpoint Offset temperature sensor Startup delay after power failure Relays on at sensor failure Function cooling or heating Switch on delay relays 1 Switch off delay relays 1 Parameter 16 17 in sec or min inimum on time relays inimum off time relays etwork number Software version Production year Production week Serial number x1000 Serial number units 1 On active delay led on blinks Function Diagram Function HEAT or Function COOL Pee Pe ae Si eS ne ee l gt l gt i Temp Temp l l Diff Diff Setpoint Setpoint Dimensions 7 5 60 Connection Diagram Address VDH Products BV Produktieweg 1 9301 ZS Roden The Netherlands ALFA NET 3X series REMARK To terminate RS485 Network Connect a 250 Ohm resistor between Line A and Line B at both cable ends vi i Common OV Pp E N
3. User manual ALFA NET 31 0 100 C Cool Heat Thermostat A Cy ALFA 31 VDH doc 053950 Version v1 0 Date 14 12 2005 Software ALFA31 0 100 C File Do053950 WPD Range 0 100 C per 1 C Function The ALFA NET 31 is a digital thermostat for panel mounting The function from the thermostat can be programmed for cooling or heating The ALFANET 31 has a RS 485 network connection so it can be read out and adjusted on the Alfanet Installation On the topside of the ALFA NET 31 you can see how the sensor power supply and relay have to be connected After connecting the ALFA NET 31 to the power supply a self test function is started As this test is finished the measured temperature appears in the display When the relay is activated the led on will light up in the display Control The ALFA NET 31 thermostat can be controlled by three pushbuttons on the front These keys are SET view change the setpoint UP increase the setpoint DOWN decrease the setpoint Viewing setpoint By pushing the SET key the setpoint appears in the display The led set starts blinking A few seconds after releasing the SET key the setpoint disappears and the measured temperature is shown 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 and together with the UP or DOWN keys the setpoint can be changed A few seconds after releasing the k
4. eys the measured temperature shows again in the display Setting internal parameters Next to the adjustment of the setpoint some internal settings are possible like differential sensor offset setpoint range and the function cooling or heating By pushing the DOWN key for more than 10 seconds you enter the internal programming menu In the left display the upper and lower segment are blinking With the UP and DOWN keys the required parameter can be selected see the parameter table If the required parameter is selected the value can be read out by pushing the SET key Pushing the UP or DOWN keys together with the SET key allows you to change the value of this parameter If no key is pushed for 20 seconds the ALFA NET 31 changes to its normal operation mode Adjustment sensor The sensor can be adjusted by using the Sensor Offset parameter 04 Indicates the ALFA NET 31 e g 2 C too much the Sensor Offset has to de decreased by 2 C Error messages In the display of the ALFA NET 31 the following error messages can appear Er Sensor broken Solution Check if the sensor is connected correctly Check the sensor 1000Q at 25 C Replace the sensor EE Settings are lost Solution Reprogram the settings Technical details Model ALFA NET 31 Range 0 100 C readout per 1 C Supply 230 Vac or else see product sticker Relay SPDT 250V 16A C NO 8A C NC cos phi 1 Communication RS
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