Manual
Weld Seam Detection System R4000 SND40
for Tubes, Cans and Drums
Operation
B0059001 / Rev. 2.3
80
ROLAND ELECTRONIC GmbH · Otto-Maurer-Str. 17 · DE 75210 Keltern · Phone +49 (0)7236-9392-0 · Fax +49 (0)7236-9392-33
7.12 Special parameters for sensor signal „Eddy current“
Parameter:
„Low
pass
“
Reducing the value improves
the signal quality under
influence of RF interferences
(e.g. frequency converters,
annealing facilities).
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:
b
w
2
sec]
/
[
×
=
mm
v
f
H
Example: Tube-Ø = 63,5 mm,
Circumference = approx. 200 mm,
Rotation rate = 1 turn/second
Effective width w
b
= 4mm
Hz
f
H
25
8
200
=
=
For Low pass: Lp = 3f
H
= 75 Hz
For High pass: Hp = 1/3f
H
= 8 Hz
Standard value:
Auto
Value range:
-
Parameter:
„
High pass
“
Enlarging the value
improves the signal quality
under influence of LF
interferences (e.g.
variations of distance due to
insufficient sensor holders
or uneven tubes).
Standard value:
Auto
Value range:
-
Parameter:
“Frequency“
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.
Standard value:
50 KHz
Value range:
1 - 800 kHz
Parameter:
“Phase“
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
“
Standard value:
none
Value range:
0 - 359°
Parameter:
“Signal type“
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.
Standard value:
Y Component
Value range:
Amplitude, Y Component
Parameter:
“Input gain“
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.
Standard value:
20 dB
Value range:
20 dB - ...
Parameter:
“
Output AC voltage
“
This value should only be changed in exceptional cases.
Decreasing the value will decrease the sender signal and thus
attenuate the sensor signal.
Standard value:
20 V
Value range:
0 - 20 V
Parameter:
“DC Voltage offset [mV]“
This parameter should not be changed.
Standard value:
0
Value range:
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