VDH ALFANET 95 User manual

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User manual
ALFANET 95
Cool/Freeze thermostat with a temperature sensor,
two defrost sensors, a day/night digital input,
relays for defrost-1, defrost-2, fan, cool and alarm.
VDH doc. 041617 Version: v1.6 Date: 10-04-2012
Software: 050182_ALFANET 95 RTDF File: Do041617.wpd Range: -50,0/+50,0/C
*Description.
The ALFANET 95 is a cooling/heating thermostat with various automatic defrost and fan control.
It can be programmed through the ALFANET PC-INTERFACE on the PC.
*Installation.
On the connection diagram of the ALFANET 95 is show how the sensor, the digital input, the RS485
network, the power supply and the relays should be connected. After the ALFANET 95 has been
connected to the power supply a self-test function will take place, after which the measured
temperature will appear in the display.
*Operation.
The ALFANET 95 thermostat can be operated by means of four pushbuttons on the front. These
pushbuttons are:
SET - view / change the setpoint.
UP - raise the setpoint.
DOWN - lower the setpoint.
/C- hidden key under the /C text.
*Normal operation status.
During normal operation the temperature of the control sensor (Temp.) is shown in the display.
*Status of the Relays.
Press the /Ckey. The three lower segments light up and the
upper vertical segments show the status of the five relays
(see diagram). Relay is active when the segment lights up.

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*Viewing the setpoint.
By pressing the SET key the setpoint becomes visible. At the same time the decimal point of the right-
hand display will blink, as an indication that the setpoint is being read.
A few seconds after the SET key has been released, the setpoint will disappear and the measured
value will again become visible.
*Changing the setpoint.
Press the SET key so that the setpoint appears on the screen. Release the SET key. By now pressing
the SET key and at the same time the UP or DOWN keys, the setpoint can be adjusted.
A few seconds after the keys have been released, the measured value will again appear in the display.
*Day/night function.
The ALFANET 95 has also the possibility to work with night shift (parameter P80) of the setpoint, to
do so the external contact must be opened.
Day: Contact day/night closed = day mode.
Controller works on setpoint.
Night: Contact day/night opened = night mode.
Controller works on setpoint + P80 (night-shift)
F.i. Setpoint = +10,0OC and P80 = -3,0OC than the control-setpoint becomes;
+10,0 + (-3,0) = +7,0OC
Remark: The day/night function does not work on the real-time clock of the ALFANET 95.
*Start/stop defrost cycle.
The defrost cycle is stopped and started automatically by internal parameters. Defrosting can also be
done manually;
Stop: If defrosting is taking place, defrosting can be stopped manually by pressing the DOWN
and UP keys simultaneously.
Start: If defrosting is not taking place, then defrosting can be started manually by pressing the
DOWN and UP keys simultaneously.
* Technical data.
Type : ALFANET 95 Cool/Defrosting Thermostat
CONTROL-UNIT;
Range :-50,0/+50,0/C
Read-out :3-digit 7-segments display
Accuracy : ± 0,5 % of the range.
Status LEDs : ALARM, COMPR., FAN, DEFR.1 and DEFR.2 (On display via /Ckey)
Operation : via pushbuttons on the front.
Front : Polycarbonate IP65
Network :RS485-network (2x twisted-pair shielded) at the back (A, B, Gnd)
Dimensions :35 x 77 x 71,5mm (hbd)
Panel cutout : 29 x 70mm (hb)
I/O-UNIT;
Supply : 230 Vac 50/60Hz (-5/+10%) Max. 3VA
Relays :These two relays have one common;
Ry-1 Alarm SPDT (NO,NC) 250V/8A (cos n=1)
Ry-2 Cool SPST (NO) 250V/8A (cos n=1)
And these three relays have one common;
Ry-3 Fan SPST (NO) 250V/8A (cos n=1)
Ry-4 Defrost-2 SPST (NO) 250V/8A (cos n=1)
Ry-5 Defrost-1 SPST (NO) 250V/8A (cos n=1)
Sensors : 3x SM 811 2-wire (Temp. / Defr.-1 / Defr.-2) (PTC 1000S/25/C).
Contact input :1x Day/night contact input (open = night-shift active)
Dimensions :90x71x58mm (hbd) for rail mounting
- Equipped with memory protection in case of power failure.
- Equipped with a self-testing function.
- Equipped with sensor failure detection.
- Connection via screw terminals on supply/relay module.
- Special models available on request.

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* Fan control settings
The ALFANET 95 has various adjustment possibilities for the Fan. Normally, the fan is always running
unless one of the parameters below is set at 1:
Parameter 20 = 1: Fan switch differential active.
The fan runs only if the temperature of the defrost sensor is lower than the control sensor
temperature minus the temperature of the switch differential fan (P21)
{Fan on if Tdefrost < (Tcontrol - Tfandiff.)}.
Parameter 25,26: Fan switching on delay after defrosting.
To prevent the fan from running immediately after defrosting and draining of the evaporator and
thus blowing warm air into the cell, the following two conditions can be set;
a. The fan is blocked until the defrost-sensor measures a temperature that is lower than the set
switch-on temperature of the fan (P25).
b. The fan is blocked until the switch-on delay of the fan (P26) is passed. When the defrost-
sensor reaches the switch-on temperature (P25) within the switch-on delay, then the fan is
released again.
Parameter 22 = 1: Fan is off, when the compressor is off.
The fan is turned off if the compressor is off. This happens with a delay of parameter 23.
*Defrost control possibilities.
The automatic defrost is started on a real-time (P60) clock basis and stops after the maximal defrost
time (P30), or earlier if the defrost sensor has reached the set defrost-end-temperature (P31). The
ALFANET 95 has a number of automatic defrost possibilities that can be set with the following
parameters;
Parameter 24 Type of defrost:
The ALFANET 95 has three possibilities for defrosting;
P24 = 0 At defrost only the relay FAN is switched on (natural defrosting).
P24 = 1 At defrost only the relay DEFR. is switched on (hot gas / electrical defrosting).
P24 = 2 At defrost the DEFR. and the FAN relays are both switched on (hot gas/electrical+fan
defrosting).
Parameter 60 = 1 Defrosting on the real-time clock
Here, the defrosting is started at fixed times (P61 up to and including P72).
*Adjusting the sensor.
The control sensor can be adjusted by means of the Offset control sensor parameter 05.
The defrost sensors can be adjusted by means of the Offset defrost sensor parameters 08 and 11.
For readout the temperature of the defrost sensors choose parameters 07 and 10.
Should a sensor of the ALFANET 95 indicates 2/C too much, for example. Then the according Sensor
Offset must be lowered by 2/C.
*Operation of the Alarm.
When there is an error or an alarm, a error code message appears in the display. The ALFANET 95
remembers this error message, even if the problem has already been solved.
The error message can be reset with the SET key.
If, after pressing the SET key (=reset alarm) the alarm is not yet resolved, then the ALFANET 95
shows the temperature and error code alternately, if the alarm has been resolved then the error code
disappears and the temperature is shown again.

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*Error messages.
The following error messages may appear in the display of the ALFANET 95;
LO -Minimum alarm. Solution E1/E2/E3:
HI -Maximum alarm. - Check if sensor is properly connected.
E1 -Control sensor defect. - Check sensor (1000S/25/C).
E2 -Defrost sensor-1 defect. - Replace sensor.
E3 -Defrost sensor-2 defect. Solution EEE:
EEE - Settings have been lost. - Program the settings again.
-L- - In case of a short-circuited sensor the error codes E.. and -L- will alternate in the
display, indicating a short-circuited sensor.
-H- - In case of a disconnected sensor the error codes E.. and -H- will alternate in the
display, indicating a disconnected sensor.
NOTE: Parameters 12 and 13 can be used to prevent or delay occasionally occurring E1
messages.
*Setting internal parameters.
In addition to adjusting the setpoint a number of internal adjustments can be made, including the
differentials, sensor-offsets, setpoint range, compressor settings, fan settings and the defrosting
settings.
By pressing the DOWN key for longer than 10 seconds it is possible to enter the 'internal programming
menu'. In the left-hand display the upper and lower segment will blink to indicate this mode.
Using the UP and DOWN keys the desired parameter can now be selected (see the parameter table).
When the desired parameter has been selected, the value of the parameter can be read out by
pressing the SET key. The parameter value can now be changed by pressing the SET key together
with the UP or DOWN key.
If, after 20 seconds, no key has been pressed, the ALFANET 95 will revert to the normal operation
mode.
*Parameters ALFANET 95.
Para-
meter
Description of Parameter Range Standard
value
01
02
03
04
05
06
07
08
09
10
11
12
13
Switching differential
Minimum adjustable setpoint
Maximum adjustable setpoint
Readout above -10/C in whole degrees
Offset control sensor
Defrost sensor-1 present
Readout defrost sensor-1
Offset defrost sensor-1
Defrost sensor-2 present
Readout defrost sensor-2
Offset defrost sensor-2
Extra damping on control sensor *
E1 (control sensor defect) delay *
*) Readout/change only at control-unit, not on ALFANET
0,1..15,0°C
-50..+50°C
-50..+50°C
0 = No, 1 = Yes
-15,0..+15,°C
0 = No, 1 = Yes
-
-15,0..+15,°C
0 = No, 1 = Yes
-
-15,0..+15,°C
0 = No, 1 = Yes
0..99 Seconds
0,5
-50
+50
0
0,0
0
-
0,0
0
-
0,0
0
0
15
16
Compressor anti-shuttle time
belonging to parameter 16
Compressor shuttle protection
0 = start-up delay in seconds
1 = start-up delay in minutes
2 = delay between switch off and switch on minutes
3 = delay between switch on and switch on min.
0...99 Minutes
0...3
10
0

Para-
meter
Description of Parameter Range Standard
value
5
20
21
22
23
24
25
26
27
Fan switch-differential active
Fan switch-differential
Fan off if compressor is off
Fan switch-off delay
Type of defrost 0=only fan-relay
1=only defrost-relay
2=defrost-relay + fan-relay
Fan switch-on temperature after defrost
Fan switch-on delay time after defrost
Drip off time
0 = No, 1 = Yes
0,5..+50,0°C
0 = No, 1 = Yes
0..90 Minutes
0 = Natural
1 = Hot gas/Elec.
2 = Hot gas/Elec. + Fan
-50..+50°C
0..90 Minutes
0..90 Minutes
0
2,0
0
0
0
2,0
0
0
30
31
32
33
34
35
36
Maximum defrost time
Defrost-ending temperature
Display fixed during defrost
Defrost cycle time
Defrost cycle time based on compressor on time
After power failure starting with defrost cycle
Defrost delay after power failure
0..99 Minutes
-50..+50°C
0 = No, 1 = Yes
1..99 hours
0 = No, 1 = Yes
0 = No, 1 = Yes
0..99 minutes
15
2,0
0
12
0
0
0
40
41
42
43
44
45
46
47
48
Type of alarm
Minimum alarm setpoint
Maximum alarm setpoint
Time-delay maximum alarm
Time-delay minimum alarm
Compressor on at control sensor failure
Alarm off after manual reset
Alarm off after alarm is solved
Function alarm relay
0 = None,
1 = Absolute
2 = Relative
-50..+50°C
-50..+50°C
0..99 Minutes
0..99 Minutes
0 = No, 1 = Yes
0 = No, 1 = Yes
0 = No, 1 = Yes
0 = Watch alarm,
1 = Control alarm
1
-50
+50
0
0
0
0
0
0
50
51
Current time (hours)
Current time (minutes)
0..23 Hours
0..59 Minutes
-
-
60
61
62
63
64
65
66
67
68
69
70
71
72
Real-time defrost active
Defrost time-1 (hours)
Defrost time-1 (minutes) per 10 min.
Defrost time-2 (hours)
Defrost time-2 (minutes) per 10 min.
Defrost time-3 (hours)
Defrost time-3 (minutes) per 10 min.
Defrost time-4 (hours)
Defrost time-4 (minutes) per 10 min.
Defrost time-5 (hours)
Defrost time-5 (minutes) per 10 min.
Defrost time-6 (hours)
Defrost time-6 (minutes) per 10 min.
0 = No, 1 = Yes
0..23/off Hrs.
0..50/off Min.
0..23/off Hrs.
0..50/off Min.
0..23/off Hrs.
0..50/off Min.
0..23/off Hrs.
0..50/off Min.
0..23/off Hrs.
0..50/off Min.
0..23/off Hrs.
0..50/off Min.
0
off
0
off
0
off
0
off
0
off
0
off
0
80 Night-shift (offset) -10.0..+10.0 0,0
90
95
96
97
98
99
Network number
Software version
Production year
Production week
Series number (x1000)
Series number (units)
1..250
0..255
00..99
1..52
0..255
0..999
1
-
-
-
-
-

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*Dimensions of ALFANET 95.
Control-unit
I/O-unit

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*Connection data.
Diagram: 042527w2

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* Function diagram.
*Address
VDH Products BV Tel: +31 (0)50 - 30 28 900
Produktieweg 1 Fax: +31 (0)50 - 30 28 980
9301 ZS Roden Email: [email protected]
Netherlands Internet: www.vdhproducts.nl