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Operation
7.12
Special parameters for sensor signal „Eddy current"
Parameter:
Standard value:
Value range:
Parameter:
Standard value:
Value range:
Parameter:
Standard value:
Value range:
Parameter:
Standard value:
Value range:
Parameter:
Standard value:
Value range:
Parameter:
Standard value:
Value range:
Parameter:
Standard value:
Value range:
Parameter:
Standard value:
Value range:
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80
ROLAND ELECTRONIC GmbH · Otto-Maurer-Str. 17 · DE 75210 Keltern · Phone +49 (0)7236-9392-0 · Fax +49 (0)7236-9392-33
Weld Seam Detection System R4000 SND40
for Tubes, Cans and Drums
„Low pass"
Reducing the value improves
the signal quality under
Auto
influence of RF interferences
-
(e.g. frequency converters,
annealing facilities).
„High pass"
Enlarging the value
improves the signal quality
Auto
under influence of LF
-
interferences (e.g.
variations of distance due to
insufficient sensor holders
or uneven tubes).
"Frequency"
50 KHz
1 - 800 kHz
"Phase"
none
0 - 359°
"Signal type"
Y Component
Amplitude, Y Component
"Input gain"
20 dB
20 dB - ...
"Output AC voltage"
20 V
0 - 20 V
"DC Voltage offset [mV]"
0
Manual
In the standard setting the suitable value (frequency)
will be automatically entered.
Another individual value can only be entered and
used if the system parameter "Filter automatic" has
been previously set to "off" .
Formula for determining the main frequency:
v
[
mm
/
sec]
=
f
H
×
2
w
Example: Tube-Ø = 63,5 mm,
Circumference = approx. 200 mm,
Rotation rate = 1 turn/second
Effective width w
200
=
=
f
25
H
8
For Low pass: Lp = 3f
For High pass: Hp = 1/3f
Enlarging the value improves the detection of weld seam
characteristics at the exterior surface of the material (e.g. jutting-
out of seam at outside).
Reducing the value improves the detection of weld seam
characteristics at the interior surface of the material (e.g. jutting-
out of seam at inside).
Changing the frequency normally requires adaptation of the
parameters "Phase" and "Input gain". For most applications a
value of 25 - 100 kHz is optimal.
Changing the value turns the eddy current signal at the X/Y level, it
is used for optimizing the signal on use of the signal type "Y
Component"
On analysing the amount, the eddy current signals are evaluated
independently from their phase position (X/Y indication). This
setting should only be used for very pithy weld seam signals with
a weld seam detection not affected by noise signals.
The usage of the Y Component setting can often improve the
signal quality. Therefore, the parameter "Phase" must be set
accordingly.
Increasing the value can result in better signal quality, but also in
overdriving the input stage. When changing the frequency, this
parameter must be adjusted.
This value should only be changed in exceptional cases.
Decreasing the value will decrease the sender signal and thus
attenuate the sensor signal.
This parameter should not be changed.
B0059001 / Rev. 2.3
b
= 4mm
b
Hz
= 75 Hz
H
= 8 Hz
H
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