User manual ALFANET 75 RTDF
Contents
1. after pressing the SET key reset alarm the alarm still is not solved than the ALFANET 75 RTDF displays the temperature and the error message alternated is the alarm solved then the error message disappears and the temperature is displayed normally Fan control The ALFANET 75 RTDF has several parameters for fan control Normally the fan is always active accept for one of the following parameters is set to 1 the fan can be stopped Parameter 20 1 Fan switch differential active The fan is only active when the defrost temperature is parameter 21 lower than the measured product temperature Fan on Tii lt Tomroi Tug P21 As there are no further conditions to switch the fan off Parameter 25 26 Fan on delay after defrost The fan is switched off during defrost and to prevent blowing in hot air in the cabin after defrost and the dripping off time parameter 27 there are two conditions which can be set a The fan is blocked until the defrost sensor measures a temperature lower than the temperature setting of parameter 25 b The fan is blocked until the defrost delay time of parameter 26 has stopped Unless the defrost sensor has reached the temperature setting of parameter 25 Parameter 22 1 Compressor off than Fan off The fan deactivates as the compressor deactivates with a delay of parameter 23 minutes Provided that there are no other conditions to deactivates the fan Defrost control The automatic defrost i2. minimum alarm 0 99 Minutes Time delay maximum alarm 0 99 Minutes Control delay after power failure 0 99 Minutes Compressor on at control sensor failure OzNo 1 Yes Compressor off at minimum alarm OzNo 1 Yes Realtime hours 0 23 Hours Realtime minutes 0 59 Minutes Time correction at realtime clock 99 99 Sec Yr Real time defrost active O No 1 Yes Defrost time 1 Hours 23 off Hours Defrost time 1 Minutes 50 off Min Defrost time Hours 23 off Hours Defrost time Minutes 50 off Min Defrost time Hours 23 off Hours Defrost time Minutes 50 off Min Defrost time Hours 23 off Hours Defrost time Minutes 50 off Min Defrost time Hours 23 off Hours Defrost time Minutes 50 off Min Defrost time Hours 23 off Hours Defrost time Minutes 50 off Min DoOUU amp i 00 IN IS oo0oo0oo0oo00000000 Para Description Parameter Range Default meter Value Night shift offset of Setpoint 10 0 10 0 C Start day Hours 0 23 off Hours Start day Minutes step 10 Min 50 off Min 0 Start night Hours 0 23 off Hours Start night Minutes step 10 Min 0 50 off Min Network number Software version Production Year Production Week Serial number x1000 Serial number units Technical details Type ALFA 75 RTDF Cool Defrost Thermostat Range 50 0 50 0 C Supply 12 Vac 16 5Vdc 5 10 Read out 9 digit 7 segments display Status Led s COMPR FAN and DEFR On displa
3. 12Vac Temp sens ea RS 485 NETWORK CONNECTIONS Controller 1 Controller 2 Controller x One of the Controllers can be the PC Interface n IS idi Eran E a als oo gt Dlo ork a ec Tm Jew ES E Endpoint Network cable Connection Network cable Endpoint Network 2 wire shielded point 2 wire shielded Network min 0 75mm Network min 0 75mm Max Cable length 1KM Network connections Place Terminator Resistor A HI connected to A HI of 250 Ohm at both ends of B LO connected to B LO the RS485 cable between GND Shield connected to GND Shield line A and line B Note 1 DO NOT CONNECT SHIELD GND 0V TO GROUND 2 NETWORK CABLE MAY NOT HAVE ANY SIDE BRANCHES Function diagram Function COOL Diff 1 15 C Setpoint 50 50 C Address VDH Products BV Tel 31 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 nl
4. User manual ALFANET 75 RTDF C Cool Defr Thermostat we SET with fan control and ER realtime defrost COMFR __ FAN______DEFR VDH doc 020994 Version v1 2 Date 15 02 2005 Software ALFA NET 75 RTDF File DO020994 WP8 Range 50 0 50 0 C Description The ALFANET 75 RTDF is a cool defrost thermostat with various defrost and fan control settings And it is controllable on the PC thru the ALFANET PC INTERFACE Installation On the top side of the ALFANET 75 RTDF is shown how the sensor power supply and relays has to be connected After connecting the ALFANET 75 RTDF to the power supply a self test function is started As this test is finished the measured temperature of the temperature sensor control appears in the display Control The ALFANET 75 RTDF thermostat can be controlled by four push buttons on the front These keys are SET View change the setpoint UP increase value DOWN decrease value C hidden push button above SET key and behind C symbol View setpoint By pushing the SET key the setpoint appears in the display The decimal point of the last display starts blinking to indicate this After a few seconds after releasing the SET key the setpoint disappears and the measured temperature is shown again 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 chan
5. f this parameter If after 20 seconds no key is pushed the ALFANET 75 RTDF changes to it s normal operation mode Sensor adjustment The temperature sensor can be adjusted by using the Offset control sensor parameter 05 The defrost sensor can be adjusted by using the Offset defrost sensor parameter 07 For read out of the defrost sensor on the display use parameter 06 Indicates a sensor e g 2 C too much the according Sensor offset parameter has to be decreased with 2 C Error messages In the display of the ALFANET 75 RTDF the following error messages can appear LO Minimum alarm Solution E1 E2 HI Maximum alarm Check if sensor is connected correctly E1 Control sensor failure Check sensor 10000 25 C E2 Defrost sensor failure 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 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 a error messages appears it can be reset by pushing the SET key The function of this key depends on parameter P37 Alarm As a failure or alarm occurs an error message is shown in the display The ALFANET 75 RTDF remembers it s error message although it is already solved The error message is resettable with the SET key As if
6. ge the setpoint After a few seconds after releasing the SET key the setpoint disappears and the measured temperature is shown again 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 Li off on and a on the last segment natural defrost active The code Li means relay 1 compr and 2 fan are on and relay 3 defr is off Manual starting stopping of defrost The defrost cycle is automatic started and stopped These defrost settings thru internal parameters Stop defrost If there is a defrost cycle the defrost can be manually stopped by pushing the UP and the DOWN key simultaneously Start defrost If there is no defrost cycle the defrost can be manually started by pushing the UP and the DOWN key simultaneously Setting internal parameters Next to the adjustment of the setpoint some internal settings are possible like differentials sensor adjustments setpoint range compressor fan defrost and alarm settings By pushing the DOWN key for more than 10 seconds you enter the internal programming menu In the left display the upper and the lower segments 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 and DOWN keys allows you to change the value o
7. he Defrost mode is default set to Natural Defrost Defrost relay not active parameter 24 Parameters ALFANET 75 RTDF Para Description Parameter Range Default meter Value Switching differential 15 0 C Minimum setpoint eo Seb c Maximum setpoint 50 50 C Read out above 10 C per 1 C OzNo 1 Yes Offset Control sensor 15 0 415 0 C Read out Defrost sensor 7 Offset Defrost sensor 15 0 415 0 C Defrost sensor present O No 1 Yes Start up delay Cooling Switch off delay Cooling Parameter 10 11 in Sec or Min 1 Min Minimum on time Cooling A Minutes Minimum off time Cooling s Minutes Switching differential Fan active O No 1 Yes Switching differential Fan 0 50 C Fan off as Compressor is off OzNo 1 Yes Switch off delay Fan 0 90 Minutes Defrost mode O only fan relay OzNatural l only defrost relay 1 Hotgas Elec Switch on delay temp fan after defrost 50 50 C Switch on delay time fan after defrost 0 90 Minutes Dripoff time 0 90 Minutes Defrost interval time 1 99 Hours Maximum defrost time 0 99 Minutes End of defrost temperature 50 50 C Compressor on while defrosting O No 1 Yes Defrosting on compressor time O No 1 Yes Temperature display locked during O No 1 Yes defrost cycle Start with defrost after power up OzNo 1 Yes Defrost on delay after power up 0 99 Minutes Alarm mode OzNone 1 Absolute 2 Relative Minimum alarm setpoint 50 50 C Maximum alarm setpoint 50 50 C Time delay
8. s started by the defrost cycle time P30 and stopped by the maximum defrost time P31 or sooner by reaching the maximum defrost temperature P32 Further has the ALFANET 75 RTDF additional parameters to control defrost Parameter 24 Defrost mode The ALFANET 75 RTDF has two defrost modes P24 0 While defrosting only the Fan activates Natural defrost P24 1 While defrosting the relay DEFR activates Hotgas Electrical defrost Parameter 34 0 Defrost at fixed interval time P60 0 In this case parameter 30 is the chosen interval time Parameter 34 1 Defrost based on total Compressor time P60 0 In this case the Defrost is started as the Compressor has been activated for parameter 30 hours Parameter 60 1 Defrost based on Real time Clock In this case the Defrost is started at fixed times set with parameters P61 until P71 Parameter 36 2 1 The ALFANET 75 RTDF starts with Defrost on Power up After Power up the ALFANET 75 RTDF first starts with a delay of parameter 37 minutes before starting Defrost while in delay the ALFANET 75 RTDF works normally Parameter 33 1 Compressor active at Defrost P24 1 For hot gas Defrost systems the Compressor needs to be activated while defrosting After Defrost the Drip off time parameter 27 starts During this time the defrost relay and the compressor are not active so the Cool unit can drip off Remark The Defrost sensor is default not active parameter 08 and t
9. y thru C key Relays The three Relays have one common Ry 1 Cool SPST NO 250V 8A cos p 1 Ry 2 Fan SPST NO 250V 8A cos p 1 Ry 3 Defrost SPDT NO NC 250V 8A cos p 1 Control Thru pushbuttons on front Front Polycarbonate IP65 Sensor 2x SM 811 2m PTC 10000 25 C Communications RS485 Network 2 wire shielded min 0 75mm Dimensions 35 x 77 x 71 5mm HWD Panel cutout 29 x 70mm HW Accuracy 0 5 of range Provided with memory protection during power failure Equipped with self test function and sensor failure detection Connection with screw terminals Special version on request available Dimensions 69 5 65 Q 0 Connections Trafo 3VA 230 12Vac VDH art nr 350 010073 REMARK Connect a 250 Ohm Resistor between PT Line A and Line B at both CABLE ENDS UO of RS485 Network 2 wire with shield E d Q r lt o N cay lt w 1 1 LO oO v co OdoO0 c c t ll er N ALFANET 75 lt 5 oa 2 wire with shield 14 18 12 11 12 345 e 4r YNYOYN FN N Y N es o o cic Uo ojos c c of o of o Elu c o en es es en EI 2 E 1 1 1 1 ojo E 1 w e o oju m o v ol we al j c a To ec e ES vA 2 v V ca r es o u O uL o o c SUPPLY 2x SM811 q v
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