4 Technical specifications
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 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.
Technical specifications
Sensor system
Sensor accuracy: . . . . . . . . . . . . . . . . . . . . ± 0.1 mm.
Distance to indication pin:
. . . . . . . . . . 5 ± 3 mm.
Stroke length:
. . . . . . . . . . . . . . . . . . . . . . . 0.1 - 80 mm.
Electrical connection:
Direct main cable gland entry (hard wired) PG11 (ø4 - ø10 mm).
Direct external/sensor cable gland entry PG7 (ø3 - ø6.5 mm) option, external sensor.
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
The power supply to the complete unit is taken from the AS-Interface loop. The unit is reverse polarity protected.
Supply voltage: . . . . . . . . . . . . . . . . . . . . . . 29.5 - 31.6 VDC
Normal current consumption sensor
board: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 mA (excluding current for the solenoids and the external sensor).
Max. current consumption sensor
board: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165 mA (If external devices e.g. solenoids and switches are connected to the sensor
board, a higher current consumption than 120 mA may occur and this will damage the
sensor boards).
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
Signals transmitted through the AS-Interface BUS to the AS-Interface master PLC.
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