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Alfa Laval ThinkTop Basic Automation Valve.

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ThinkTop® Basic

ThinkTop® Basic Digital 10 - 30 VDC PNP/NPN

Application
ThinkTop BasicThe ThinkTop® Basic is designed to ensure optimum valve control in conjunction with Alfa Laval sanitary valves and it is compatible with all major PLC systems (Programmable Logic Controller) with a digital PNP/NPN interface. It is for use in food, dairy and brewery installations and in biopharmaceutical applications. The ThinkTop® Basic fits all air operated valves from Alfa Laval.

Working Principle
The ThinkTop® Basic is a basic control head including sensor unit and solenoid valves to control processing valves. It is used to control and supervise pneumatic valves and is mounted on top of the valve. It receives signals from a PLC to control the solenoid valve and it sends the valve status feedback signals back to the PLC. To adapt the sensor unit to the specific valve, the users make a simple set-up by using local keys.

Sensor System
The sensor system is the well known and approved "No Touch" principle from the ThinkTop® platform without any mechanical sensor adjustments.
A magnet is mounted on the valve stem and the magnetic field (axial) is detected by build in sensor chips inside the sensor unit. The measuring angle from each chip is used in calculations to locate the current position of the valve stem. There can be programmed 2 PNP or 2 NPN feedback signals. The selection of PNP or NPN is done by a jumper on the sensor board itself. The LEDs are constantly indicating the status of the unit: Valve position, solenoids activated, set-up and local fault indication.

Feedback Signals
Output signals from the sensor unit to the connected digital interface (PLC).
Nominal voltage: . . . . . . . . . . . . . . .Same as connected to the ThinkTop® Basic.
Load current: . . . . . . . . . . . . . . . . . .50mA typical, 100mAmax.
Voltage drop: . . . . . . . . . . . . . . . . . .Typical X V at 50 mA.

Sensor Detection System
Sensor accuracy . . . . . . . . . . . . . . .+/- 0,1 mm.
Tolerance band: . . . . . . . . . . . . . . . .+/- 5 mm.
Distance tomagnet: . . . . . . . . . . . . .5 +/- 3 mm.
Stroke length: . . . . . . . . . . . . . . . . .0,1-80 mm.

PNP/NPN Polarity
PNP (sourcing) or NPN (sinking) function is selected by a jumper in terminals 9 and 10. Jumper present = PNP (standard). If changing to NPN remove the jumper and make a power recycle. A power recycle is always required when changing this function.

Solenoid Valves
0 to 3 solenoid valves in each unit possible.
Type: . . . . . . . . . . . . . . . . . . . . . . .3/2 or 5/2 port (only possible with one 5/2 port).
Air supply: . . . . . . . . . . . . . . . . . . . .300-900 kPa (3-9 bar).
Filtered air,max. particles of dirt: . . . . .0,01 mm.
Max. flow: . . . . . . . . . . . . . . . . . . . .180 l/min.
Throughput: . . . . . . . . . . . . . . . . . .¸ 2,5 mm.
Max. oil content: . . . . . . . . . . . . . . .1,0 ppm.
Max. water content: . . . . . . . . . . . . .0,0075 kg/kg air.
Manual hold override: . . . . . . . . . . . .Yes.
External air tube connection: . . . . . . . .¸ 6mmor¼". (Select when ordering).
Silencer/filter**): . . . . . . . . . . . . . . . .Connection possible via ¸ 6 mm or ¼".
Nominal voltage: . . . . . . . . . . . . . . .24 VDC.
Nominal power: . . . . . . . . . . . . . . . .1.0 W.
**): Filter recommended in tropical regions.

Technical Data

Materials
Plastic parts: . . . . . . . . . . . . . . . . . .Nylon PA 6, reinforced.
Steel parts: . . . . . . . . . . . . . . . . . . .Stainless steel ASI 304/316.
Air fitting: . . . . . . . . . . . . . . . . . . . .Special coated brass (FDA approved).
Seals: . . . . . . . . . . . . . . . . . . . . . .Nitrile (NBR).

Power Supply - DC
The ThinkTop® Basic is designed to be part of the PLC's Input/Output (I/O) system. It should be supplied from the same protected power supply as the other I/O devises. The I/O power supply should not be used for other kinds of loads. The unit is reverse polarity and short circuit protected. The power supply must meet the requirements of EN 61131-2.

Supply voltage: . . . . . . . . . . . . . . . .10-30 VDC.
Supply voltage nominal: . . . . . . . . . . .24 VDC ( +20%- 15%) - pr. EN 61131-2.
Max. ripple: . . . . . . . . . . . . . . . . . . .5% of nominal supply voltage.
Supply voltage absolutemax.: . . . . . . .30 VDC.
Supply voltage absolutemin.: . . . . . . .10 VDC.
Supply current): . . . . . . . . . . . . . . . .Max. 45mA (for sensor unit alone, excluding solenoids).
*): The initial current during power-on is higher. The actual shape of the current pulse depends on the power supply used. Typical values are 150 mA RMS during 13 ms (regulated PS) to 350 mA RMS during 8 ms (unregulated PS).
The fulfilling of the UL requirements in UL 508 requires that the unit is supplied by an isolating source complying with the requirements for class 2 power units (UL 1310) or class 2 and 3 transformers (UL1585).

Typical Power Consumption ThinkTop® Basic
Test conditions = One ThinkTop® Basic connected and 1 feedback active (on) and:
Power Consumption
Note! "Power-on" current is higher. See power supply - DC.
 
Micro environment demand specifications:
Enviroment Demands
 
Electrical connections
Electrical Connections1. De-energized (PLC input)
2. Energized (PLC input)
3. Activation of solenoid # 1 (PLC output)
4. Activation of solenoid # 2 (PLC output)
5. Activation of solenoid # 3 (PLC output)
6. Supply voltage sensor (+) 10-30 VDC
7. Supply voltage sensor (0) 0 V
8. Common supply solenoids
9. PNP/NPN jumper*)
10. PNP/NPN jumper*)
11. Solenoid common, internal connection
12. Solenoid # 1, internal connection
13. Solenoid # 2, internal connection
14. Solenoid # 3, internal connection
Fig. 1. Basic design, ThinkTop® Basic. *) Jumper present = PNP. If changing the function a power recycle is necessary.
The selection NPN/PNP is done by the jumper.
Note! Remember to isolate wires that are not in use.
Basic Design
 
 
1. Sensor unit
2. Light guide
3. O-ring
4. Base
5. Adapter
6. Shell
7. Terminals
8. Activator stem
9. Cable gland
10. Special X-ring
11. Air fitting
12. Solenoid valve (3/2 or 5/2)
13. Safety valve
14. Solenoid valve (3/2)
Fig. 2. Basic design, ThinkTop® Basic.
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Clearance
C* = Clearance.
 
Fig. 3. Dimensions.
 

LED's
A. Energized (yellow).
B. Set-up/fault (red).
C. Solenoids (yellow)
D. De-energized (green)

Ordering
Please state the following when ordering:
- ThinkTop® Basic
- Digital 10-30 VDC PNP/NPN.
- Number of solenoids (0-3).
- Type of solenoids (3/2 or 5/2 port).
- Air connection ¸6mm or 1/4"
- Please state if for series 700 valves.
- For ThinkTop® Basic used on SSV-LS Stop valve size 63.5 - 101.6 mm/DN 65 - 100: Special indication pin must be used; 9612-6370-01.
- Unique SSV Long Stroke: Special indication pin must be used; 9613-1581-01.

Note! For further details, see also instruction manual ESE00225.

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