User manual ALFA-45A and ALFANET-45A
Contents
1. 8 1 with 45 Connectors FRONT HOUSING Alarm NC ALARM NETWORK RELAY OUTPUT Optional RS 485 NETWORK REMARKS Shield on one side of the cable connected to Earthi Connect a 250 Ohm Terminator Resistor between Line A and Line B at both CABLE ENDS of RS485 cable 3 wire shielded min 0 75 AA2. 15 15 C 0 3 1 99 hrs 0 99 min 99 99 C 99 99 C 0 99 min 0 99 min 0 99 C 0 99 min 0 99 min 15 15 C 0 99 min 0 99 mi temp Compressor control The compressor relay activates when the product sensor measures a higher temperature than the setpoint switching differential parameter 1 and deactivates when the temperature descents below setpoint There are 4 different modes off delay on the compressor possible with parameter 05 as shown below Parameter 05 0 The compressor relay has a start up delay of parameter 6 seconds Parameter 05 1 The compressor relay has a start up delay of parameter 6 minutes Parameter 05 2 After switching off the compressor waits at least parameter 6 minutes before switching on again Parameter 05 3 In between the switching on points the compressor waits at least parameter 6 minutes Next options for Compressor control are available Parameter 15 A compressor on delay after power failure of parameter 15 minutes Parameter 24 1 The compressor relay activates at product sensor failure Fan control The ALFA NET 45A 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 13 C lower then the measurement of the product
3. 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 product 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 afer releasing the keys the measured product temperature is shown again in the display Manual starting stopping of defrost The defrost cycle is automatic started and stopped These defrost settings thru internal parameters At active defrost the led defrost is Stop defrost If there is a defrost cycle the defrost can by manually stopped by pushing the UP key and than the SET key while the UP key is hold Start defrost If there is no defrost cycle the defrost can be started manually by pushing the UP key and than the SET key while the UP key is hold 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 more than 10 seconds you enter the internal programming menu In the left display the upper and lower segment are blinking Over the UP and DOWN keys the required parameter can be selected see table for the parameters If the required parameter is
4. User manual ALFA 45A and ALFANET 45A CPU unit SUPPLY unit defrost set DODODWOOOOOOOOO ALFA 45 Modulbox Cool Defrost thermostat H SUPPLY UNIT with Fan control and Watch Alarm ODCOOCOCOOCOOCOOO VDH doc 053775 Version v1 1 Datum 17 03 2006 Software ALFA 45A Doc Do053775 wpd Range 50 50 C per 1 C Installation The ALFA NET 45A consist of two parts a Supply unit for rail mounting and a CPU unit for front mounting with operation buttons display and alarm relay These two units are connected with each other by an cable with 8 pole data connector On the front of the ALFA 45A Modulbox supply unit is shown how sensors power supply and relay are to be connected The watch alarm relay with C NC contact is to be connected on the CPU unit After connecting the ALFA NET 45A to the power supply a self test is started As this test is finished the measured temperature of the product sensor appears in the display The Supply unit has three relay outputs one for the compressor one for the fan and one for defrost The compressor relay and the defrost relay got there own led indication in the display And the ALFANET 45A is by use of the ALFANET PC INTERFACE controllable on the PC Control The ALFA NET 45A thermostat can be controlled by three pushbuttons on the front These keys are SET _ view change of settings UP increase of settings DOWN decrease of settings Viewing setpoint By
5. e min 0 75 Only at ALFANET 45 A Polycarbonate 35 x 77 x 71 5mm hwd 28 x 70mm hw SUPPLY unit of the ALFA 45A Supply Max used power Fuse Product sensor Defrost sensor Relay Compressor Relay Defrost Relay Fan Sizes Supply unit Operation temperature Operation rel humidity Ventilation 230 Vac 50 60Hz 6 2 No internal fuse present SM 811 2m SM 811 2m SPST 250V 16A C NO cos phi 1 SPST 250V 8A C NO cos phi 1 SPST 250V 8A C NO cos phi 1 58x71x90mm hwd for rail mounting 0 50 C 10 90 RH not condensing Keep ventilation holes open Provided with memory protection during power failure Connection with screw terminals Equipped with self test function and sensor failure detection Special version on request available Address VDH Products BV Produktieweg 1 9301 ZS Roden The Netherlands Tel 31 0 50 30 28 900 Fax 31 0 50 30 28 980 Email info vdhproducts nl Internet www vdhproducts nl 60 Dimensions CPU unit Connections Dimensions SUPPLY unit 90 62 46 loom Supply 230Vac 50 60Hz MODULBOX Tieng Connector to CPU unit CONTROL SENSOR wh wh DEFROST gnd Common brown ALFA 45 Modulbox SUPPLY UNIT Relay 16A Compressor Relay 8A Fan Relay 8A Defrost
6. perature alarm report E4 Minimum temperature alarm report Solution for E1 and or E2 Check if the sensor is connected correctly Check the according sensor 10000 25 Replace according sensor Settings are lost Fatal error settings are lost and display shows EE Solution for EE Reprogram the settings Alarm Function The ALFA NET 45A has a minimum alarm P02 setting and a maximum alarm P03 setting When the temperature is beyond these limits the display shows E3 maximum alarm or E4 minimum alarm immediately The alarm delay P18 is also started and as the alarm is still on after the delay the alarm relay will be deactivated C NC contact is closed Normally no alarm and power on controller the alarm relay is activated C NC contact is open The alarm will not be stored Technical details Types ALFA 45A Cool Defrost Thermostat with fan control ALFANET 45A Cool Defrost Thermostat with fan control and RS485 network connection CPU unit of the ALFA NET 45A Range Display Control Status LEDs Alarm relay Communication Front Sizes CPU unit Panel cutout CPU unit 50 50 C readout per 1 C 3 digit 7 segment display pushbuttons on the front 1xLED compr 1xLED and 1xLED defrost SPST 250 8A C NC cos phi 1 Relay normally active the C NC contact is open and at alarm the C NC contact is closed ALFANET RS485 Network 3 wire shielded cabl
7. r running hours The defrost is started when the compressor has run for parameter 7 hours after the last defrost Parameter 26 1 The temperature readout on the display is locked during defrost cycle Parameter 27 1 After power up the ALFA NET 45A starts with defrost after running thru the defrost delay time of parameter 14 While running down the delay the ALFA NET 45A can cool after this delay the defrost is started Parameter 22 1 On hot gas systems the compressor is switched on during defrost After defrost the dripping off time of parameter 12 is started During this time the defrost and compressor relay are deactivated so the condenser can drip off it s water Sensor adjustment The product sensor Temp can be adjusted by using the Offset product sensor parameter 04 The defrost sensor Defr can be adjusted by using the Offset defrost sensor parameter 16 For readout of the defrost sensor on the display use parameter 19 Indicates a sensor e g 2 C to much the according Sensor Offset has to de decreased with 2 C Alarms In the display of the ALFA NET 45A the following error messages can appear E1 sensor error Fatal error display shows E1 and all relays are deactivated accept when parameter 24 is 1 then the compressor and fan are activated as needed 2 Defrost sensor error Non fatal error the ALFA NET 45A goes on regulating and the display shows E2 Maximum tem
8. 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 45A changes to it s normal operation mode Parameters ALFA NET 45A DESCRIPTION PARAMETER STANDARD VALUE Switching differential Minimum temperature alarm Maximum temperature alarm Offset product sensor Compressor start up protection start up delay in sec start up delay in min delay between switch off and switch on in min delay between switch on and switch on in min Compressor start up time belonging to parameter 05 Defrost interval Maximum defrost time End of defrost temperature Fan on temperature P21 1 Fan delay time P21 1 Drain time in min Switching differential fan P20 1 Defrost delay after power failure when parameter P27 1 Startup delay after power failure Offset defrost sensor Fan off delay if parameter P23 1 Alarm delay Readout defrost sensor Fan switch differential active Fan off while defrost active Compressor on at defrost Compressor off gt Fan off Compressor on at product sensor failure Defrost cycle time based on compressor running time Temperature display locked during defrost cycle Start with defrost after power failure Network number Software version Production year Production week Serial number x1000 Serial number units 1 15 C 50 50 C 50 50 C
9. temperature As there are no further conditions to switch the fan off e g Parameter 13 2 and the product sensor measures 10 C than the fan is only active as the defrost sensor measures 10 2 8 C or less Parameter 21 1 Fan off on defrost cycle The fan is switched off during defrost and to prevent blowing in hot air in the cabin after defrost and the dripping off time there are two conditions which can be set 1 The fan is blocked until the defrost sensor measures a temperature lower than the temperature setting of parameter 10 2 The fan is blocked until the defrost delay time of parameter 11 has stopped Unless the defrost sensor has reached the temperature setting of parameter 10 When the defrost sensor is broken Failure E2 the ALFA NET 45A runs down the entire time of parameter 11 Parameter 23 1 Compressor off gt Fan off The fan deactivates as the compressor deactivates with a delay of parameter 17 minutes Provided that there are no other conditions to deactivates the fan Defrost control The automatic defrost is started by the defrost cycle time P07 and stopped by the maximum defrost time P08 or sooner by reaching the maximum defrost temperature P09 Further has the ALFA NET 45A additional parameters to control defrost Parameter 25 0 Function defrost with a fixed defrost cycle time With parameter 7 as the chosen cycle time Parameter 25 1 Function defrost based on total compresso
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