OperationInstruction_Vsision XP - 第69页

Vision XP+ V AC Page 61 4 Equipment 4.4 The Process Chamber Operating Instructions V ersion 1.5 4.4.9 T he Cooling T ract Note! The transm ission zone is loca ted at the transition be tween the peak zone and the cooling …

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Page 60 Vision XP+ VAC
4 Equipment
4.4 The Process Chamber
Operating Instructions
Version 1.5
4.4.8 Sensors at the vacuum chamber
Fig. 4-31 Sensors at the Vacuum chamber
Fig. 4-32 Sensors at the Vacuum chamber
Optical fibre sensors are mounted
before and after the vacuum
chamber for PC board identification.
The sensors’ degree of soiling is
determined via the light intensity.
Cleaning and setting are described
in detail in the “Maintenance"
Chapter.
Vision XP+ VAC Page 61
4 Equipment
4.4 The Process Chamber
Operating Instructions
Version 1.5
4.4.9 The Cooling Tract
Note!
The transmission zone is located at the transition between the peak zone
and the cooling zone. A heating module is installed to the first cooling zone
which can be activated if necessary. The cooling gradient can be adjusted in
a highly flexible manner by means of temperature an frequency through the
use of this heating module. This infinitely adjustable influence on the cooling
gradient is necessary in order to assure stressless cooling for sensitive com-
ponents.
4.4.10 Safety switch cooling section VXP+
Fig. 4-33 The Cooling Tract
The PCBs are cooled down with the
help of nozzle sheets, which are lo-
cated above the conveyor system.
The required gas recirculation is
generated over blowers located at
the rear side of the system.
Fig. 4-34 Safety switch cooling section VXP+
As soon as the cooling section is
opened, the additional safety switch
in the cooling section is activated.
The fans of the cooling section are
switched off for safety-related pur-
poses.
Page 62 Vision XP+ VAC
4 Equipment
4.4 The Process Chamber
Operating Instructions
Version 1.5
4.4.11 Quick cooling down SSP (option)
4.4.12 Quick cooling SSP+
Fig. 4-35 Quick cooling down SSP
Fig. 4-36 Quick cooling down SSP
For the option cooling down an ad-
ditional suction pipe as well as an
electric shut-off valve are used in
the rear part of the machine below
the heating.
This option „Quick cooling down“ is
used for quick cooling down of too
hot zones after program change.
Fig. 4-37 Quick cooling SSP+
The first throttle actuator is for cool-
ing the preheating zones to facilitate
more effective zone separation.
The second throttle actuator is in-
stalled for quick cooling of peak
zones.