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3.1.1 “No Touch” sensor system
Type: Alfa Laval “No Touch” System
For wire connections: See section 4.4 “Electrical connection, internal”.
Features
Tolerance programmes.
Self adjustment programme (SRC/ARC valves only).
Built-in maintenance monitor.
Setup by internal pushbuttons or remote control (IR Keypad).
Setup and local fault supervision.
Setup saved at power shutdown.
Visual LED Indicator lights.
Sensor System
Unique “No Touch” sensor system without any mechanical sensor adjustments. A magnet is mounted on the valve stem and the
magnetic field (axial) is detected by sensor chips inside the sensor unit. The measuring angle from each chip is used to locate the
current position of the valve stem with an accuracy of ± 0.1mm. Note that the distance to the magnet can be 5 mm ± 3 mm.
Feedback signals
The sensor system can be used for 4 feedback signals + 1 status signal = 5 digital PNP/NPN feedback signals. Selection of PNP
or NPN is done by a jumper. Two of the feedback signals can be used for external sensors if necessary.
The status signal is used for detection of the following three conditions:
• A set-up is in progress.
• Internal error.
• Maintenance is required (based on time and/or the self adjustment programme).
Tolerance programme:
Individual according to valve types.
• Type 1: SRC/ARC and Series 700 valves.
• Type 2: LKB (LKLA-T).
• Type 3: Unique, SMP-SC Spillage-Free, SRC-PV and AMP.
• Type 4: SMP-SC, SMP-TO, SMP-BC, SMP-BCA and SBV.
• Type 0: (Preset) All Parameters Set To Default (also valid for MH Koltek valve and SMP-EC
(seat-lift indication not possible for SMP-EC)).
Preset and reset values: Tolerance programme No. 0 (± 5mm) and all functions are disabled.
NOTE!NOTE!
NOTE!NOTE!
NOTE! Important to select the right tolerance programme.
3. Technical specifications3.1 ThinkTop
®
, PLC 8-30 VDC interface
Feedback signals
Supply voltage
Solenoid common
PLC Cable
Solenoid signals
Sensor unit
Sensor board
PLC Interface board
IR
Rx
LEDs
IR Remote control
Terminals
Terminals
Internal connections
Solenoid signals
Solenoid common
External seat-lift (PNP)
Supply sensors
PLC, feedback
Serial
link
External connections
+5 V
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