7 Operations Listed By Purposes
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LS-R700 permits setting another sets of leak limits for DET stage, DET(UL2) and DET(LL2) which are called
Noise Reduction (NR) limits, besides DET(UL) and DET(LL) limits. The ranges between those two sets of
limits are considered as uncertain judgment regions. While NR feature is enabled, NR process
automatically starts right after the normal leak test cycle when a measured leak data in DET stage falls in the
uncertain judgment region.
In the NR process, DET stage is repeated for the previously set number of times and make a judgment,
however, leak test ends instantaneously if GO judgment is made before repeating the set number. The
number of iteration of DET stage can be set up to 20. Setting the iteration number to 1 disables the NR
feature.
1)
Enter 2 or larger number to NR Iterations
> Main Menu > Settings > Advanced Settings > Leak Limit
> NR Iterations
2)
Enter DET (UL2)
3)
Enter DET (LL2)
3.6 Setting Exhaust Interference Prevention
When using several leak testers to measure different cavities on
the same part simultaneously, some interference may occur when
one leak tester finishes its cycle while the other(s) are still in the
leak test process. This is called “Exhaust Interference.”
Exhaust interference can cause jumps in the leak tester readout
during the exhaust of one of the other testers, both in normal leak
test and Mastering Value Samplings.
In order to prevent this, all leak testers on the station must be
synchronized with one another before exhausting air. With this
software, the leak tester will keep holding the test pressure in the
part even after it makes the judgment, as long as the START
signal is turned on. As soon as the START signal turns off, the
test pressure will be vented to atmosphere.
In order to utilize this feature, the PLC must be programmed in
such a way that it would hold the START signal until it receives the
judgment signal of every tester in its control.
There are two types of Exhaust Interference Prevention. One is
interference among the pneumatic circuits of its own system.
The other is interference with other leak testers.
Enable EXH. Interference Prev
> Main Menu > Settings > Common Settings > Basic Settings
> EXH. Interference Prev > Select Enable
Setting the iteration number to 1 disables the NR feature. In
this case, those NR limits, DET(UL2) and DET(LL2), can be
simply used as additional limits. With these, defected parts
can be sort out according to the degree of leakage.
NOTE
START 1
BUSY 1
JUDGMENT 1
END 1
START 2
BUSY 2
JUDGMENT 2
END 2
START 3
BUSY 3
JUDGMENT 3
END 3
Tester 1
completed
All testers exhaust
simultaneously.
Tester 2
completed
Tester 3
completed
Time
Extension
All testers made
judgment.
Time
Extension
