General Description, Mounting; General Description, Mounting Page - Rechner Sensors KXA-5-1 Series Adjustment Instructions Manual

General description • Mounting • KXA-5-1... / KXA-5-4... / KXS-...
Evaluation unit KXA-5-...
Sensor KXS-...
The principle of operation for the KXS-/KXA-Series of sensors is based on the three-electrode-principle. With
this measuring principle a counter-electrode is essential, this is normally provided by the machine potential or
the potential of the plant or by the protective wire PE. For most of the measurements it is irrelevant where the
counter-electrode is in relation to the proximity sensor. The counter-electrode can be a far greater distance
relative to the real measuring distance.
The maximum achievable sensing distances can be more then 100 mm, dependent on the diameter of the
sensor and the dielectric constant ε
determined with the adjustment.
Mounting:
The evaluation units KXA-5-... are available in 2 versions
• A one-point evaluation unit KXA-5-1-...(see dimension No. 1 Page 11)
• A multiple evaluation unit KXA-5-4... for 4 switching points (see dimension no. 2, Page 33)
For each of these 2 versions there are two different variants:
• The „MINI" version that combines with M5, M8 and M12 sensors
• The version with no addition to the part number with combines with M18, M30, M32 sensors
The recommended evaluation unit should always be used, in order to exploit the optimal adjustment range,
that means from sensing distance zero to maximum. Using the wrong evaluation unit will limit the adjustable
range.
Mounting of the sensor / BE-Connection:
If the sensor is not mounted in metal a galvanic connection has to be made from the electronics to the potential
of the protective wire. This can be made by means of:
1. The metal housing of the sensor KXS-... or with the M3-screw of plastic body sensors
2. The soldering tag on the evaluation unit KXA-5-1-...
3. The BE connection terminal at the evaluation units or KXA-5-4-...
With multiple measurements it is sufficient to make this connection 1 x each Machine/Plant. Only when the
machine parts are electrically isolated must each machine part be connected separately. The BE container
earth should be connected over the shortest distance close to the measuring place. Do not make an earth
circuit. Connect the sensors to the evaluation unit. The connection of the supply voltage has to be made
according to the diagram on the unit.
Wire connection:
Wiring should be routed separately or screened from large value conducting cables, as in extreme cases
inductive peak voltages can destroy the sensors despite the integrated protective circuit. Screened cables
or twisted lines are especially recommended with long cable runs > 5 m.
Please take note that the use of a DC/DC-transducer calls for a higher current than the operating current
briefly when switching on the equipment. Therefore the power pack must have enough low-impedance
(No-load current + 50 mA)!
10
of the object to be detected. The sensitivity of the measurement is
r