KLASCHKA BDK-1.3, Технические данные инструкция

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BDK-1.3, BDK/FS-, …/FP-, …/PN-, …/OB-1.3 Sheet Metal Thickness / Double Sheet Detection
Ref. no. 20.05-80, ...-81, ...-82, ...-93, 20.21-01
Series Universal Double Sheet Metal Monitor
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29 BDK GB 5.17 KLASCHKA
In connection with these messages the press controller al-
lows an individual evaluation via three potential-free relay
outputs K0 ... K2.
The current status of operation can be taken from the actual
signal behaviour. The details of the signal behaviour are de-
scribed from page 9.
Parameters and similar are entered using the four keys and
their possible combinations (detailed description under pos.
5).
Devices with a fieldbus interface, for example Profinet,
transmit via this interface instead of the relay outputs the
measured value, the 0-, 1- and 2-sheet metal messages, the
memory location number of the current program and the cur-
rent threshold value.
The selection of the measuring program and initiation of the
measurement can take place via either a parallel PLC inter-
face or the fieldbus interface.
When being operated without PLC (stand-alone operation),
the measurement program can be selected on the device it-
self and the measuring operation can be initiated by a prox-
imity switch inside the sensor.
4. Versions
4.1. Single Surface Contact Measurement
For single surface contact measurement, the DSP Sheet
Metal Thickness Sensor can be used for monitoring ferrous
sheets with thicknesses ranging from 0.2 to 5.5 mm. The
BDWF sensor is suitable for non-ferrous sheets from 0.2 to
5.5 mm thickness.
With the DSPW sensor ferrous sheets in the range of 0.2 and
4 mm and non-ferrous sheets between 0.2 and 3 mm can be
monitored.
The DSP Sheet Metal Thickness Sensors for ferrous work-
pieces have an exciter coil which generates a strong mag-
netic field. The workpiece is temporarily pulled onto the sen-
sor head and brought to magnetic saturation by the high flux
density. A sensor coil measures the saturation flux density,
which is approximately proportional to the thickness.
In the BDWF Sheet Metal Thickness Sensor for non-ferrous
workpieces, an exciter coil induces an eddy current in the
non-ferrous workpiece to be measured. The sensor coil
measures the field caused by the eddy current, which is ap-
proximately proportional to the thickness. Since the work-
piece is not pulled onto the sensor head, no essential air gap
between workpiece and sensor head is permissible during
measurement. In both types of measurement, the accuracy is
about 0.1 mm at the calibration point or about 5 % of the end-
of-scale value across the measurement range.
The DSPW Sheet Metal Sensor combines the two measuring
methods of DSP and BDWF.
Note:
On the display, the indication of the sensor type
(DSPW/FE for ferrous, DSPW/NE for non-ferrous
sheets) allows to select the material being used.
A general statement about the permissible air gap for single
surface contact measurement is not possible because it is
influenced by the thickness, the type of sheet metal, and the
sensor being used. Basically, there should be no air gap, nei-
ther between the sensor and the workpiece nor between the
workpieces in the case of a double sheet. See diagrams in
the chapter “Sheet Metal Thickness Sensors”.
4.2. Double Surface Non-contact Measurement
The double surface non-contact measurement is realised by
the Sheet Metal Thickness Sensors BDWD/S (transmitter)
and BDWD/E (receiver) for ferrous magnetic sheets with
thicknesses ranging from 0.2 to 3 mm and for non-ferrous
magnetic sheets with thicknesses ranging from 0.2 to 20 mm.
Note:
On the display, the indication of the sensor type
(BDWD/FE for ferrous, BDWD/NE for non-ferrous
sheets) allows to select the material being used. Via
the parameterisation of the sensor connection in the
menu Parameter, the transmitter BDWD/S and re-
ceiver BDWD/E can be assigned to the according
connection (XS1 or XS2).
A transmitter coil in the (BDWD/S) transmitter generates an
alternating magnetic field. A receiver coil in the (BDWD/E)
receiver measures the field, which is attenuated approxi-
mately proportionally to the thickness of the workpiece.
The accuracy is about 0.2 mm at the calibration point or
about 5 % of the end-of-scale sensor value across the meas-
urement range. This measurement procedure is insensitive to
the relative position workpiece – sensor heads and to air
gaps between workpieces, which may move during meas-
urement. Between sensor and sheet metal, however, a mini-
mum distance of 10 mm must be kept.
Strong sources of magnetic interference can influence the
measurement results.
4.3. Single Surface Non-contact Measurement
The DSD Sheet Metal Sensor is suitable for monitoring
pieces of ferromagnetic sheet metal (other materials on re-
quest) with a thickness range from 0.5 to 12 mm. The work-
pieces, however, must be placed on a solid reference plate,
for example, a conveyor belt.
The distance between the sensor and workpiece is detected
by the DSD sensor. Since the distance between the sensor
and the supporting plate is fixed, the thickness of the work-
piece can be calculated as the difference between the two
distances. The measured thickness can be compared with
the nominal value in order to detect the presence of a double
sheet.
The accuracy at the calibration point is 0.2 mm with DSD-18
and 0.5 mm with DSD-60 or 5 % of the end-of-scale sensor
value across the entire measurement range.
Measurement can be taken as the metal sheet moves along
the sensor. With the single surface non-contact measure-
ment, an air gap between the workpieces and between the
workpiece and the supporting plate can directly influence the
measured thickness (The measured thickness will appear to
be greater than the actual thickness).