User manual ALFA 15 and ALFANET 15
Contents
1. Place Terminator resistor of 250 Ohm only at both ends of the RS485 cable ee ec ee ee ee ee o e o a between line A and line B controller with a jumper Place Pullup down resistors the controller with jumpers Or use ALFA 1 TERMINATOR Vac Vdc see sticker Supply 7 x nv nv fN fN Sl NZ oN EN S Oa m is So oa S PpO wv vwo Z p WU no woe m ost ww 29 Pe N a ms a aN ep ed in gt v ao e aM w 3 msc E cx ee Los Tp oO O OU S POZOS w o Ee e a O y crva amp cs e OC O Onc e N em lt o0 S O LOr DO 33 gt w os OD pV rawr an o y lt o S o v c amp u cA ow OOo O a oO Q voE st EFS tia Cm pP w aDPAaA TnEO EA Optional Connection diagram m 1 4 gt D Dd oa Vos Z oO _ _ _ ENYE Sr ae in Re Cool ALFA 15 Network connections Pair 1 Connect A HI to A HI Connect B LO to B LO Pair 2 Connect GND 0V to GND 0V Shield Connect Shield to clean Earth Endpoint Network cable Connection Network cable Endpoint only on one side of cable Network 2 twised pair shielded point 2 twised pair shielded Network min 0 5mm Network min 0 5mm Pair 1 AIB Pair 2 Gnd Max Cable lenath 1KM Pair 1 A B Pair 2 Gnd Note 1 AVOID LONG STUB CABLES No longer than 0 5M otherwise use a Repeater Address2. 50V 16A C NO 8A C NC cos phi 1 Control by pushbuttons on the front Communication RS 485 Network 2xtwisted pair shielded only at ALFANET model Front Polycarbonate IP65 Sensor SM 811 2m 10000 at 25 C Sizes gt 90 x 53 x 58mm hwd Panel hole 46 x 53mm hw Provided with memory protection during power failure Connection with screw terminals on the backside Equipped with self test function and sensor failure detection Special versions are available upon request Setting internal parameters Next to the adjustment of the setpoint some internal settings are possible like differential sensor offset setpoint range and the defrost function By pushing the DOWN key for more than 10 seconds you enter the internal programming menu In the left display the upper and lower segments are blinking With 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 keys allows you to change the value of this parameter If no key is pushed for 20 seconds the ALFA NET 15 changes to it s normal operation mode Parameters ALFA NET 15 PARA DESCRIPTION PARAMETER STANDARD METER VALUE 03 04 Switching differential 115 C 3 Minimum setpoint 50 50 C 50 Maximum setpoint 50 50 C 50 Offset temperature sensor 15 15 C 0 05 Compressor start up protectio
3. User manual ALFA 15 and ALFANET 15 fay fee a St ae eee ee ah Pe a veer s o Cool Defrost Thermostat VDH doc 061283 Version v2 1 Date 05 12 2007 Software 043376 ALFA 15 25 35 File Do061283 wpd Range 50 50 C per 1 C Function The ALFA NET 15 is a digital thermostat for rail mounting The thermostat controls the cooling and defrost The temperature readout is in hole degrees Celsius Defrost will be done by temporarily switching off the cooling natural defrost The defrost starts on intervals or on compressor runtime The defrost stops on time The ALFANET 15 has a RS 485 network connection so it can be read out and adjusted on the Alfanet Installation On the connection diagram of the ALFA NET 15 you can see how the sensor power supply and relay have to be connected After connecting the ALFA NET 15 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 15 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 i
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5. n 0 0 start up delay in seconds 1 start up delay in minutes 2 delay between switch off and switch on in minutes 3 delay between switch on and switch on in minutes Compressor start up time belonging to 10 parameter 05 Defrost cycle time 1 99 hours 12 Defrost time 0 99 minutes 15 Defrost delay after power failure 0 99 minutes 0 if parameter 14 is 1 Startup delay after power failure 0 99 minutes 0 Relay on at sensor failure 0 No 1 Yes 0 Defrost cycle time based on compressor on 0 No 1 Yes 0 time Temperature display locked during defrost 0 No 1 Yes 0 cycle After power failure starting with defrost cycle 0 No 1 Yes 0 Maximum time display locked after defrost 0 60 minutes 5 if parameter 13 1 1 Network number Software version Production year Production week Serial number x1000 Serial number units Function diagram Function COOL Diff Setpoint Dimensions OOOOO0000 OQOOO00000 ju 90 62 46 oie es SS 23 48 58 Shield only at one RS 485 NETWORK CONNECTIONS 2 twisted pair shielded cable One of the Controllers can be the PC Interface Repeater is also a contr May be provided in the For signal conditioning only at one point in the Shield only at Network May be provid one side of the cable to Earth Shield only at one side of T the cable to Earth Line B Lo
6. s 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 keys the measured temperature is show in the display Starting stopping defrost The defrost cycle is automatically started and stopped Programming by the internal parameters During defrost the led defrost will light up If there is a defrost cycle the defrost can be stopped by hand pushing the UP key and then the SET key while the UP key is held If there is no defrost cycle the defrost can be started by hand pushing the UP key and then the SET key while the UP key is held Adjustment sensor The sensor can be adjusted by using the Sensor Offset parameter 04 Indicates the ALFA NET 15 e g 2 C too much the Sensor Offset has to be decreased by 2 C Error messages In the display of the ALFA NET 15 the following error messages can appear Er Sensor broken Solution Check if the sensor is connected correctly Check the sensor 10000 at 25 C Replace the sensor EE Settings are lost Solution Reprogram the settings Technical details Model ALFA 15 Cool Defrost Thermostat ALFANET 15 Cool Defrost Thermostat with Network Range 50 50 C readout per 1 C Supply 230 Vac 1 2VA 50 60Hz or else see product sticker Relay SPDT 2
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