VDH ALFA 51 User manual

User manual
ALFA 51 and
ALFANET 51
-50/+150°C (0,1)
Rail-Thermostat
VDH doc. 120818 Version: v1.0 Date: 09-01-2015
Software: ALFA(N) 51/61/71 F File: Do120816.wpd Range: -50/+150,0°C
*Installation.
On the connection diagram of the ALFA(NET) 51 is shown how the sensors, power supply and relays
are to be connected. After connecting the ALFA(NET) 51 to the power supply, a self test function is
started. As this test is finished, the measured temperature appears in the display. Normally this is the
temperature of sensor-1, unless sensor-2 is active as control sensor (P05=1) in that case the average
temperature of both sensors is displayed and used for control. The ALFANET 51 is by use of the
ALFANET PC-INTERFACE controllable on the PC.
*Control.
The ALFA(NET) 51 thermostat can be controlled by four pushbuttons on the front. These keys are:
SET - view / change of set value and confirm alarms
>(UP) - increase set value.
?(DOWN) - decrease set value.
MODE - relay status key.
*Viewing setpoint.
By pushing the SET key the setpoint appears in the display. The decimal point of the last display starts
blinking. A few seconds after releasing the SET key the setpoint disappears and the measured
temperature is shown again 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 together with the UP or DOWN keys to change the setpoint. A few seconds after releasing
the keys the measured temperature shows again in the display.
*Viewing the individual sensors.
By pressing the UP and DOWN key together, the individual sensors can be shown in the display. After
releasing the keys, the measured temperature of sensor-1 can be shown by pushing the UP key or the
measured temperature of sensor-2 can be shown by pushing the DOWN key. A few seconds after
releasing the keys the (average) temperature shows again in the display.
*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 0=off and 1=on. The code 110 means relay 1 and 2 are on and relay
3 is off.
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*Adjustment sensors.
Sensor-1 can be adjusted by using the Sensor Offset parameter 06 and Sensor-2 can be adjusted
by using the Sensor Offset parameter 07. Indicates a Sensor of the ALFA(NET) 51 e.g. 2°C to
much, the according Sensor Offset has to be decreased by 2°C.
*Error messages.
In the display of the ALFA(NET) 51 the following error messages can appear:
LO - Minimum alarm. Solution E1,E2:
HI - Maximum alarm. - Check if the sensor is connected correctly.
E1 - Sensor-1 failure. - Check sensor (1000Ωat 25°C).
E2 - Sensor-2 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 resetted by pushing the SET key.
The function of this key depends on parameter P37.
* Technical data.
Type : ALFA 51 Thermostat or
ALFANET 51 Thermostat
Range : -50/+150,0°C, above -10°C readout per 0,1°C
Supply : 230Vac 50/60Hz (-5/+10%)
Display : 3-digit 7-segments display
Relays : Ry1 = SPST(NO)250V/8A (cos φ=1) or 250V/5A (cos φ=0.4)
Ry2 = SPST(NO)250V/8A (cos φ=1) or 250V/5A (cos φ=0.4)
Ry3 = SPDT(NO/NC)250V/8A (cos φ=1) or 250V/5A (cos φ=0.4)
Relays have one common (C)
Control : By pushbuttons on front.
Front : Polycarbonate IP65
Sensors : 2x SM 811/2m (PTC 1KOhm @ 25°C).
Communication : RS485 Network, 2xTwisted-pair shielded min. 0,5mm2(A,B,Gnd(0V))
Dimensions : 90 x 71 x 58mm (HWD)
Panel cutout : 46 x 71mm (HW) for front mounting
Accuracy : ± 0,5% of the range
- Provided with memory protection during power failure.
- Connections with screw terminals on the back side.
- Equipped with sensor failure detection.
- Special versions are on request available.
*Setting internal parameters.
Next to the adjustment of the setpoint, internal settings can be made like differential, sensor offset,
setpoint range and the functions of the thermostat.
Push the DOWN key for more than 10 seconds, to enter the 'Internal Programming Menu'. In the left
display the upper- and lower-segment are blinking. With the UP and DOWN keys the required
parameter can be selected (see the parameter table).
If the required parameter is selected, the value can be read-out by pushing the SET key. Pushing the
UP or DOWN key to change the value of this parameter.
If after 20 seconds no key is pushed, the ALFA(NET) 51 changes to the normal operation mode.
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*Parameters ALFA(NET) 51
Para-
meter
Description Parameter Range Standard
value
01
02
03
Function Relay 1 1 = Cool
2 = Heat
3 = Alarm
Function Relay 2 (see also P 01)
Function Relay 3 (see also P 01)
1..3
1..3
1..3
1
2
3
05
06
07
Function sensor 2 0 = None
1 = Control
2 = Alarm
Offset temperature sensor 1
Offset temperature sensor 2
0..2
-15.0..+15.0 °C
-15.0..+15.0 °C
0
0.0
0.0
10
11
12
13
14
15
16
17
18
19
Switch on relay 2 by 0 = Temperature
1 = Time
Switch on relay 3 (see also P 10)
Switch on delay relay 2
Switch on delay relay 3
Switching differential relay 1
Setpoint offset relay 1
Switching differential relay 2
Setpoint offset relay 2
Switching differential relay 3
Setpoint offset relay 3
0..1
0..1
0..99 Minutes
0..99 Minutes
0.1..15.0 °C
-15..+15 °C
0.1..15.0 °C
-15..+15 °C
0.1..15.0 °C
-15..+15 °C
0
0
15
15
0.5
0.0
0.5
0.0
0.5
0.0
20
21
22
23
24
Switch on delay cooling
Switch off delay cooling
Parameter 20/21 in 0 = Seconds
1 = Minutes
Minimum on-time cooling
Minimum off-time cooling
0..99
0..99
0..1
0..99 Minutes
0..99 Minutes
0
0
0
0
0
25
26
27
Minimum setting setpoint
Maximum setting setpoint
Readout above -10°C on whole degrees
-50.0..+150.0°C
-50.0..+150.0°C
0 = No, 1 = Yes
-50
+150
0
30
31
32
33
34
35
36
37
Alarm type 0 = None
1 = Absolute
2 = Relative to setpoint
Minimum alarm setpoint
Maximum alarm setpoint
Time delay minimum alarm
Time delay maximum alarm
Relay function alarm relay
Reset alarm relay after recovering alarm
Reset alarm relay after manual reset
0..2
-50.0..+150.0 °C
-50.0..+150.0 °C
0..99 Minutes
0..99 Minutes
0= Watch alarm
1= Control alarm
0= No, 1= Yes
0= No, 1= Yes
1
-50
+150
0
0
0
0
0
40
41 Start up delay after power failure Forced relay function at sensor failure
0= None
1= Cool
2= Heat
0..99 Minutes
0..2 0 0
52 Time correction (at realtime clock) -99..99 0
90
95
96
97
98
99
Network number (only at ALFANET)
Software version
Production year
Production week
Serial number (x1000)
Serial number (units)
1..250
0..255
00..99
1..52
0..255
0..999
1
0
0
1
0
0
3

*Dimensions. *Connections.
*Adress.
VDH Products BV Tel: [phone]
Produktieweg 1 Fax: [phone]
9301 ZS Roden Email: [e-mail]
The Netherlands Internet: www.vdhproducts.nl
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