User manual ALFA 55 RTDF and ALFANET 55 RTDF
Contents
1. 2932145 995 OPA A ddns umouq 941M Z 11805 05 35 1509530 2 911UM pub UMOJQ 941M 2 11805 T YOSNAS 1041102 TAY ON ON ON ALFA 55 911UM pub g eui pue 1 98754 943 40 spua ayy 32 0092 40 0451594 JOjeUulUJ91 92e d z 19001300 91 5 soon Led pa1siM3 Z LS 440M19N 98754 I u34e3 03 uod 3e 1 gt A N AO RS 485 NETWORK CONNECTIONS 2 twisted pair shielded cable One of the Controllers can be the PC Interface Repeater is also a contr Controller 1 zs Z shield only at a one side of 0 T the cable J to Earth Endpoint Network cable Network 2 twised pair shielded min 0 5mm Pair 1 A B Pair 2 Gnd Controller 2 5485 Line B Lo Place Terminator resistor For signal conditioning 5 Shield only at a one side of LO 7 the cable to Earth lt DL gt RE 2 2 C 7 NW 2 lt 2 lt 2 0 lt 0 lt gt 2 2 2 2 of 250 Ohm only at both ends of the RS485 cable between line A and line B May be provided in the controller with a jumper Place Pullup down resistors only at one point in the Network May be provided in the con2. User manual ALFA 55 RTDF and ALFANET 55 RTDF EET Cool Defrost FEE thermostat with ser 5 fan control and ALFA 55 realtime defrost VDH doc 030087 Version v2 1 Date 10 03 2008 SW 992649 ALFA NET 55 65 75 RTDF File Do030087 wpd Range 50 0 50 0 C pro 1 C Description The ALFA NET 55 RTDF is a cool defrost thermostat for rail mounting with various defrost and fan control settings The thermostat has 6 Real Time DeFrost time settings a day available The ALFANET 55 RTDF 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 55 RTDF is shown how the sensor power supply and relays has to be connected After connecting the ALFA NET 55 RTDF to the power supply a self test function is started As this test is finished the measured temperature of the control sensor appears in the display Control The ALFA NET 55 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 MODE relay status key 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 Changin
3. Minutes steps 10 Min 50 off Min Defrost time 6 Hours 23 off Hours Defrost time 6 Minutes steps 10 Min 00 off Min Oooooooooooo Night shift offset of Setpoint 10 0 10 0 C Start day Hours 0 23 off Hours Start day Minutes step 10 Min 0 50 off Min 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 Fan control The ALFA NET 55 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 Tdefr lt Tcontrol Tfandiff 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 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 P
4. arameter 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 is 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 ALFA NET 55 RTDF additional parameters to control defrost Parameter 24 Defrost mode The ALFA NET 55 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 1 The ALFA NET 55 RTDF starts with Defrost Power up After Power up the ALFA NET 55 RTDF first starts with a delay of parameter 37 minutes before starting Defrost while in delay the ALFA NET 55 RTDF works normally Parameter 33 1 Compressor active at Defrost P24 1 For hot gas Defrost systems the Compres
5. bsolute alarm 2 Relative alarm Minimum alarm setpoint Maximum alarm setpoint Time delay maximum alarm Time delay minimum alarm Control delay after power failure Compressor on at control sensor failure Compressor off at minimum alarm Alarm mode Actual realtime hours Actual realtime minutes Time correction at realtime clock 1 15 C 50 50 C 50 50 C OzNo 1 Yes 15 415 C 15 15 1 Yes 0 99 0 99 5 1 Min 0 99 Minutes 0 99 Minutes 1 Yes 0 50 C 1 Yes 0 99 Minutes 0 Natural 1 Hotgas Elec 50 50 C 0 99 Minutes 0 99 Minutes 1 99 Hours 0 99 Minutes 50 50 C OzNo 1 Yes 1 Yes 1 Yes 1 Yes 0 99 Minutes 0 2 50 50 C 50 50 C 0 99 Minutes 0 99 Minutes 0 99 Minutes OzNo 1 Yes OzNo 1 Yes 0 23 Hours 0 59 Minutes 99 99 o o9 N N dan Description Parameter Range Default Value Real time defrost active 1 Yes Defrost time 1 Hours 23 off Hours Defrost time 1 Minutes steps 10 Min 50 off Min Defrost time 2 Hours 23 off Hours Defrost time 2 Minutes steps 10 Min 50 off Min Defrost time 3 Hours 23 off Hours Defrost time 3 Minutes steps 10 Min 50 off Min Defrost time 4 Hours 23 off Hours Defrost time 4 Minutes steps 10 Min 50 off Min Defrost time 5 Hours 23 off Hours Defrost time 5
6. 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 operation As a failure or alarm occurs an error message is shown in the display The ALFA NET 55 RTDF remembers it s error message although it is already solved The error message is resettable with the SET key As if after pressing the SET key reset alarm the alarm still is not solved than the ALFA NET 55 RTDF displays the temperature and the error message alternated is the alarm solved then the error message disappears and the temperature is displayed normally 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 inte
7. g 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 change 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 MODE key the display shows the status of the relays Each display segment shows the status of the relay output showing J off and on the last segment natural defrost active The code O 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 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 Only if parameter 08 1 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 ALFA NET 55 RTDF the
8. rnal 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 of this parameter If after 20 seconds no key is pushed the ALFA NET 55 RTDF changes to it s normal operation mode Parameters ALFA NET 55 RTDF Description Parameter Range Default Value Para meter 01 02 03 04 05 06 07 08 10 11 Switching differential Minimum setpoint Maximum setpoint Read out above 10 C per 1 C Offset Control sensor Read out Defrost sensor Offset Defrost sensor Defrost sensor present Start up delay Cooling Switch off delay Cooling Parameter 10 11 in Seconds or Minutes Minimum on time Cooling Minimum off time Cooling Switching differential Fan active Switching differential Fan Fan off as Compressor is off Switch off delay Fan Defrost mode O only fan relay 1 only defrost relay Switch on delay temp fan after defrost Switch on delay time fan after defrost Dripoff time Defrost interval time Maximum defrost time End of defrost temperature Compressor on while defrosting Defrosting on compressor time Temperature display locked during defrost cycle Start with defrost after power up Defrost on delay after power up 0 No alarm 1 A
9. sor 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 Technical details Type ALFA 55 RTDF Cool Defrost Thermostat or ALFANET 55 RTDF Cool Defrost Thermostat with network Range 50 50 C Readout pro 1 C Supply 230 2 5 50 60Hz or else see product sticker Relays The three relays have one common Ry 1 Compr SPST NO 250V 8A cos 1 Ry 2 Fan SPST NO 250V 8A cos 1 Ry 3 Defrost SPDT NO NC 250V 8A cos 1 Control Thru pushbuttons on front Front Polycarbonate IP65 Sensors Control 1 SM 811 2m PTC 10000 25 C Defrost sensor 2 SM 811 2m PTC 10000 25 C Communication RS485 network 2xTwisted pair shielded cable min 0 5mm only at ALFANET Attention both networkcable ends must be terminated with a 250 Ohm resistor between Line A and Line B Dimensions 90 x 71 x 58mm hwd Panel cutout 46 x 71mm hw at front mounting 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 versions on request available Dimensions 000000000000 o OOOOOOOOOOOO E NEN rmm 5 90 62 46 Connections Jossaudwo T Ae Lay ue4 Lay 1504 190
10. troller with jumpers Or use ALFA 1 TERMINATOR D 11 x Connection Network cable Endpoint point 2 twised pair shielded Network Network G 2 min 0 5mm Pair 1 A B Pair 2 Gnd Max Cable length depends on speed Note 1 AVOID LONG STUB CABLES No longer than 0 5M otherwise use a Repeater Function diagram Address VDH Products BV Produktieweg 1 9301 ZS Roden The Netherlands Function COOL 1 15 C Diff on Tel Fax Email Internet 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 only on one side of cable 31 0 50 30 28 900 31 0 50 30 28 980 info vdhproducts nl www vdhproducts nl
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