00196101-04_Serviceanleitung Vakuumtest 08-2018_D-E.pdf - 第72页
Service manual vacuum check with closed nozzles Page 72 fr om 136 • Start SITEST and perf orm a f irst ref erence run. • Selec t the gantr y for the d esir ed vacuum check of the placem ent head C &P6/12 • Return all…
Service manual vacuum check with closed nozzles
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4 Vacuum check with closed nozzles
4.1 On C&P 6/12 DLM heads
Damages at valve plungers, silicon hoses, sealing or within the nozzle can lead to leakage which
will cause faults in the placement process or reduces the vacuum values in the holding circuit and
the placement circuit.
Vacuum check with standard nozzle configuration
The vacuum check for placement heads C&P6/12 in the station software normally checks only
the area between vacuum generator and valve plunger.
The highlighted area (red frame) cannot be checked by a normal vacuum test:
from the body of the valve plunger via silicon hose through the sleeve via segment body to the
nozzle.
Figure 4-1:Vacuum system DLM head
Vacuum check with closed (red) nozzles
In order to do a vacuum check of the whole vacuum circuit, closed nozzles are necessary.
„Nozzle type 769 vacuum test DLM“ [03067029-01]
Service manual vacuum check with closed nozzles
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• Start SITEST and perform a first reference run.
• Select the gantry for the desired vacuum check of the placement head C&P6/12
• Return all nozzles of the placement head to the nozzle changer.
• Replace a filled magazine at one magazine position with a nozzle magazine containing
nozzles for vacuum check [03067029-01].
• In the menu nozzles on head select for segment 1 the nozzle which was configured for this
magazine position.
• Activate the checkbox all segments as segment 1
• Pick up the nozzles for vacuum check with all segments.
• Select the menu vacuum check and perform a vacuum check.
Figure 4-2: measurement with closed nozzles – nominal
The measurement values show that open values deviates by up to 3 mbar from the closed
values.
• This is within tolerances of 25mbar, which is the precondition for a correct function.
• Check the valve plungers and suction plate and replace them in case the values are out of
tolerance.
NOTE
Error Message
The Error message „difference open – closed vacuum too low“ must be ignored here.
Service manual vacuum check with closed nozzles
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Scenario 1
Figure 4-3: measurement sample, open value incorrect
Example for faulty vacuum values, which can be caused by a damaged suction plate,
at segment 2.
Scenario 2
Figure 4-4: measurement with closed nozzles - nominal
Example for faulty vacuum values which indicate a damaged silicone hose at segment 1 and an
open nozzle at segment 3.
NOTE
Several damaged suction plate
If both measurement values for a segment are around 640 mbar the suction plate could be
destroyed.
NOTE
Faulty silicone hoses
Under certain conditions faulty silicone hoses can only be detected if the segments are extended.
In that case it is recommended to switch of the servo controller for the Z axis in order to perform
the vacuum check in lowest position by single measurement.
HINWEIS
Missing valve plunger
If both measurement values for a segment are around only 210mbar it indicates a missing valve
plunger.