4 FEATURE SUMMARIES
19
4
4
.
.
7
7
C
C
l
l
a
a
m
m
p
p
O
O
u
u
t
t
p
p
u
u
t
t
While the leak tester is running and during master preset sampling, 24 VDC is generated from the 2P
connector on the leak tester rear panel. This output can be used to drive an external clamp cylinder solenoid
valve.
Output timing: DL1 to END
Electrical specification: +24 VDC, 0.1 A (max.)
4
4
.
.
8
8
E
E
x
x
h
h
a
a
u
u
s
s
t
t
I
I
n
n
t
t
e
e
r
r
f
f
e
e
r
r
e
e
n
n
c
c
e
e
P
P
r
r
e
e
v
v
e
e
n
n
t
t
i
i
o
o
n
n
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 processes.
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 judgement, 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 judgement signal of every tester in its control.
