LA 302 Pressure Controller Manual.pdf - 第17页
Description 2-1 P/N 71 19797A 2006 Nordson Corporation LA 302 Issued 06/06 Section 2 De scription Intended Use Pressure controllers in the series LA 302 can be used to control proportional pressure control valves and/or …
Safety
1-10
SIG05_EN_A_0100
2000 Nordson Corporation
Description
2-1
P/N 7119797A
2006 Nordson Corporation
LA 302
Issued 06/06
Section 2
Description
Intended Use
Pressure controllers in the series LA 302 can be used to control proportional
pressure control valves and/or glue application pumps for Nordson liquid
adhesive guns. They are designed to process cold glue and hot melt
adhesive. The two integrated outlets for electropneumatic adhesive guns
allow continuous gluing. LA 302 units can be combined with Nordson
pattern controllers for intermittent gluing.
NOTE: Cold glue and other adhesives are referred to as glue in this
manual. The pressure controller is referred to as controller.
Unintended Use - Example -
The unit may not be operated in a potentially explosive atmosphere.
Residual Risks
WARNING: Do not touch the contacts after disconnecting the mains plug.
Capacitive charge from the electronic components causes the controller to
retain residual voltage, which could result in a slight electrical shock upon
contact. The capacitive charge is discharged after approx. 60 seconds.
WARNING: Glue escapes from the adhesive gun when the solenoid valves
are triggered. Risk of splashing. Wear safety goggles. Do not program
during adhesive gun assembly.
The risk is particularly high during:
Production machine startup
Reverse mode
Manual mode
Description
2-2
P/N 7119797A
2006 Nordson Corporation
LA 302
Issued 06/06
Introduction
The LA 302 is a user-friendly pressure controller that controls proportional
pressure control valves and/or glue application pumps as a factor of the
machine speed and that triggers electropneumatic adhesive guns for
continuous gluing.
The unit is operated with easy-to-use switches and potentiometers in
conjunction with LEDs and a four-digit seven-segment display.
Updated Bill of Material
Please observe that your Nordson equipment may differ slightly from that
described in the manual or certain information provided in it. Refer to the
updated Bill of Material which is packed with your equipment.
Description of Functions
The following principle drawing demonstrates gluing with the LA 302.
Adhesive is to be applied to a substrate (9). The production machine, also
called the parent machine, transports the substrate on a conveyor belt
under the liquid adhesive gun (6). When the production machine has
reached the minimum speed, the LA 302 begins gluing.
NOTE: In general, a production machine refers to a machine in which
Nordson equipment for adhesive application is integrated (e.g. a packing
machine). The term means the same as ”parent machine”, which may
appear in other Nordson literature.
A gear box mechanically links the encoder (4) to the production machine
transport equipment. The encoder is needed to determine the parent
machine speed, and it supplies a pulse for each mm of the covered path.
When the production machine has reached the set minimum speed, the
solenoid valve on the adhesive gun switches, allowing the constant
compressed air to enter the adhesive gun and the nozzle to open.
Depending on the speed of the production machine, current of 0 to 20 mA is
supplied to the proportional pressure control valve (2). The current causes
the position of the diaphragm in the adhesive pressure regulator (12) to
change. The glue in the container (13) is fed to the adhesive pressure
regulator (12) by the pump. The glue reaches the adhesive guns (6) with
either low or high pressure, depending on the diaphragm setting.