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3. Technical specifications 3.1 ThinkTop
®
, PLC 8-30 VDC interface
Self Adjustment (SRC/ARC valves only)
The self adjustment feature is an exceptional aspect of the ThinkTop
®
design. A programme can be activated to allow an
adjustment of the tolerance band if the seals in the valve are being compressed or are worn. When the tolerance band of the unit
has been adjusted 0.3 mm, an alert warning will appear in the form of a status signal and a flashing maintenance LED. After 0.5 mm
adjustment an alarm warning appears: Loss of feedback signal, status signal and steady maintenance light indicating a minimum
of seal left requiring a replacement of the seal.
Built-in Maintenance Monitor
The unit can be preset to indicate when the time for maintenance of the valve has been reached. A status signal and flashing
maintenance LED can be programmed to return after 3, 6, 9 or 12 months or more.
3.1.2 Technical specifications sensor system
Sensor accuracy: ± 0,1 mm.
Distance to magnet: 5 ± 3 mm.
Stroke length: 0.1 - 80 mm.
Electrical connection: Direct cable gland entry (hard wired)
PG11 (ø4 - ø10 mm).
Terminals
The terminal row of the sensor unit is equipped with screw terminals for both internal as well as external cables and wires. The
terminals are suitable for wires up to 0.75 mm
2
(AWG 19).
Power Supply, must meet the requirements of EN 61131-2.
The ThinkTop
®
is designed to be a 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 devices. The I/O power supply should not be used for other kinds of loads.
The unit is reverse polarity and short circuit protected.
Supply voltage: 8 - 30 VDC.
Supply voltage nominal: 24 VDC (+20%, -15%) - pr. EN 61131-2.
Max ripple: 5% of nominal supply voltage.
Supply voltage absolute max.: 30 VDC.
Supply voltage absolute min.: 8 VDC.
Supply current*): Max. 45 mA (for sensor unit alone)
(excluding current to the solenoids, external proximity switches and the PLC input current).
*) 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 360 mA RMS during 8 ms (unregulated PS).
The fulfilling of the UL requirements in UL508 requires that the unit is supplied by an isolating source complying with the
requirements for class 2 power units (UL1310) or class 2 and 3 transformers (UL1585).
Feedback signals
Output signals from the sensor unit to the connected PLC.
Nominal voltage: Must match the selected type of ThinkTop
®
.
Load current: Typically 50 mA, max. 100 mA .
Voltage drop: Typically 3 V at 50 mA.
External sensors
The external sensors are used for seat-lift supervision when seat-lift can not be internally detected. The sensors get their supply
voltage from the terminal row.The output signals from the sensors are connected to two inputs on the terminal row on the internal
sensor unit. If the actual setup is set for internal seat-lift, the corresponding external signal is not used, otherwise the external signal
logically controls the corresponding feedback to the PLC (Programmable Logic Controller).
Supply voltage: Must match the selected type of ThinkTop
®
.
Supply current: Max. 15 mA per sensor.
Type of sensor: DC, Only 3-wire sensor PNP.
Sensor cable length: Max. 3 m.
Polarity
PNP (sourcing) or NPN (sinking) function is selected with a jumper in term. 12 and 13.
Jumper present = PNP. If changing to NPN remove the jumper and make a power recycle. A power recycle is always required
when changing this function.
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