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I. Machine Description
The PPC-N29TP unit is made up of the following components:
Double tank
Filters
Ultrasonic generator and transducers
Control panel with touchpad operator interface
Part holder
Drying chamber
II. Principles of Operation
II.1 Tank
The stainless steel tank is divided into two compartments (see
Fig. 1
) by a partition.
The height of this partition has been designed to allow the larger compartment
(
TANK 1
) to overflow into the smaller compartment (
TANK 2
). The fluid is drawn
through a fitting in the bottom of the large tank, then through filters, and then
discharged through spray lines at the top of the larger tank. The smaller tank is
filtered in the same way as the larger one. The flow rate is calculated to ensure
complete filtration of the fluid in 1-2 minutes.
II.2 Filters
The PPC-N29TP has two filtration systems. The fluid from the larger tank may
contain particles of adhesive or heavy residues (soldering cream alloys). The alloy
particles will fall out in a gravity pre-filter, and the remaining residues will be
trapped in a five-micron filter cartridge. The smaller tank will contain floating
particles that overflow from the larger tank (fluxes of soldering cream). This tank is
filtered by a separate five-micron filter. Each of the filtration systems has a
magnetically-driven pump with valves for easier filter cartridge changes. Also, on
the larger tank, there is an electronically controlled in-line heater for the cleaning
solution. This is user adjustable (See Section
III.3
), but should be set to comply
with the recommendations of the cleaning solution manufacturer.
II.3 Ultrasonic Generator
This generator is located in the rear portion of the machine and is inaccessible to the
user. It is used to deliver the necessary drive current to the transducers on the back
