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CPU-unit
Cool/Defrost thermostat
with Fan control.
VDH doc. 053884
Software: ALFA 45 F
* Installation.
The ALFA(NET)-45 consist of two parts, a Supply-unit for rail-mounting and a CPU-unit for front-
mounting (with operation buttons, display). These two units are connected with each other by a cable
with 8-pole data-connector.
On the front of the ALFA-45 Modulbox supply-unit is shown how sensors and power supply are to
be connected.
After connecting the ALFA(NET)-45 to the power supply, a self test is started. As this test has 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 -45 is by use of the ALFANET PC-INTERFACE controllable on the PC.
* Control.
The ALFA(NET)-45 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.
User manual ALFA-45
and ALFANET-45
Version: v1.3
Doc: Do053884.wpd
1
SUPPLY-unit
Range: -50/+50 C, per 1 C
Datum: 04-04-2011
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Summary of Contents for VDH ALFA-45
- Page 1 (with operation buttons, display). These two units are connected with each other by a cable with 8-pole data-connector. On the front of the ALFA-45 Modulbox supply-unit is shown how sensors and power supply are to be connected. After connecting the ALFA(NET)-45 to the power supply, a self test is started. As this test has finished the measured temperature of the product-sensor appears in the display.
- Page 2 * 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 product temperature is shown in the display. * Changing setpoint.
- Page 3 * Parameters ALFA(NET)-45. PARA- DESCRIPTION PARAMETER RANGE STANDARD METER VALUE 1..15 C Switching differential -50..+50 C Minimum setpoint setting -50..+50 C Maximum setpoint setting -15..+15 C Offset product sensor Compressor start-up protection 0..3 0 = start-up delay in seconds 1 = start-up delay in minutes 2 = delay between switch off and switch on in minutes...
- Page 4 * 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"...
- Page 5 * 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)-45 additional parameters to control defrost; Parameter 24 = 0: Function defrost with a fixed defrost cycle time.
- Page 6 * 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 18. Indicates a sensor e.g.
- Page 7 * Technical details. Types : ALFA-45 Cool/Defrost Thermostat with fan control ALFANET-45 Cool/Defrost Thermostat with fan control and RS485-network connection CPU-unit of the ALFA(NET)-45 : -50/+50 C, readout per 1 C Range Display : 3-digit 7-segment display Control : pushbuttons on the front.
- Page 8 * Dimensions CPU-unit. * Dimensions SUPPLY-unit. * Connections.
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