LA 302 Pressure Controller Manual.pdf - 第19页
Description 2-3 P/N 71 19797A 2006 Nordson Corporation LA 302 Issued 06/06 1 2 3 4 12 14 13 10 5 7 9 8 6 1 1 15 Electrical Components Compressed a ir Adhesive Fig. 2-1 Principle drawing 1 Compressed air supply with maint…
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.
Description
2-3
P/N 7119797A
2006 Nordson Corporation
LA 302
Issued 06/06
1
2
3
4
12
14
13
10
5
7
9
8
6
11
15
Electrical Components
Compressed air
Adhesive
Fig. 2-1 Principle drawing
1 Compressed air supply with
maintenance unit
2 Proportional pressure control
valve
3 Pressure controller LA 302
4 Encoder
5 Power cable solenoid valve
6 Liquid adhesive gun
7 Adhesive pattern
8 Glue line
9 Substrate
10 Transport belt
11 Uncoated adhesive pattern
12 Adhesive pressure regulator
LA 380
13 Adhesive container
14 Adhesive pump LA 300
15 Compressed air hose
NOTE: Instead of the container pump with adhesive pressure regulator
shown here, a diaphragm pump, pressure container or similar could also be
connected.
Description
2-4
P/N 7119797A
2006 Nordson Corporation
LA 302
Issued 06/06
Features
4-digit, 7-segment display, 5 LEDs and 2 mode switches for operation
and control
Automatic machine speed-dependent pressure control
1 potentiometer for setting the minimum speed (1 m/min to 300 m/min)
at which pressure control should commence
Production speed display (max. 600 m/min)
Display of minimum and maximum outlet current for the proportional
pressure control valves (0 - 20 mA)
2 potentiometers each for setting the required current (0 - 20 mA) or
0 - 10 V
DC
for each proportional pressure control valve
1 LED to indicate that the speed has fallen below the minimum speed
1 LED to indicate both automatic and manual mode
1 LED to indicate fault/short-circuited electropneumatic adhesive guns
(at > 1.6 A)
1 LED each to indicate interrupted proportional valves or proportional
pressure control valves that are not connected
2 outputs for connecting two proportional pressure control valves
2 outputs for connecting electropneumatic adhesive guns
1 output for connecting an encoder
Integrated power supply with automatic line voltage adaptation between
100 V
AC
and 240 V
AC.