LA 302 Pressure Controller Manual.pdf - 第35页
LA 302 B LA 302 1 Operation 4-5 P/N 71 19797A 2006 Nordson Corporation LA 302 Issued 06/06 Switching from Automatic to M anual Mode (Mode Switch B) Mode switch (B) is used to switch to the following modes: Position Meani…
LA 302
C
F
A
LA 302
A D
G
Operation
4-4
P/N 7119797A
2006 Nordson Corporation
LA 302
Issued 06/06
Setting Minimum Pressure (Potentiometer C)
Potentiometer (C) is used to set the minimum pressure for proportional
pressure control valve 1. The minimum pressure is the pressure required for
the glue bead to be even and cohesive at the lowest possible production
machine speed.
1. Slow down the production speed to the desired minimum speed (but not
< 1 m/min).
2. Set mode switch (A) to Pressure display.
3. Set the current for proportional pressure control valve 1 with
potentiometer (C) such that the desired bead quality is achieved.
4. Lock the setting with the fixing device on potentiometer (C).
NOTE: Potentiometer (F) is used to set the minimum pressure for
proportional pressure control valve 2. Do this by moving mode switch (A) to
the bottom setting.
Fig. 4-5
NOTE: It is advisable to make a note of the values to be able to later
replicate production (Refer to Settings Record Form at the end of this
section).
Setting Maximum Pressure (Potentiometer D)
Potentiometer (D) is used to set the maximum pressure for proportional
pressure control valve 1. The maximum pressure is the pressure required
for the glue bead to be even and cohesive at the greatest possible
production machine speed.
1. Increase the production machine speed to the desired maximum speed
(but not > 600 m/min).
2. Set mode switch (A) to Pressure display.
3. Set the current for proportional pressure control valve 1 with
potentiometer (D) such that the desired bead quality is achieved.
4. Lock the setting with the fixing device on potentiometer (D).
NOTE: Potentiometer (G) is used to set the maximum pressure for
proportional pressure control valve 2. Do this by moving mode switch (A) to
the bottom setting.
Fig. 4-6
NOTE: It is advisable to make a note of the values to be able to later
replicate production (Refer to Settings Record Form at the end of this
section).
LA 302
B
LA 302
1
Operation
4-5
P/N 7119797A
2006 Nordson Corporation
LA 302
Issued 06/06
Switching from Automatic to Manual Mode (Mode Switch B)
Mode switch (B) is used to switch to the following modes:
Position Meaning
Left Automatic operation:
Pressure controller operates with the set values.
Center No operation:
Pressure is being controlled, but any pneumatic valves
connected are not being controlled. Since the nozzles do
not open, no glue flows out. This position is useful e.g.
when filling material, etc.
Right Manual mode:
Adhesive guns open and glue flows out. Pressure is
controlled even when the production machine speed
changes. This switch position is intended to be used for
testing purposes.
Fig. 4-7
Display / LEDs
A 7-segment display and 5 LEDs serve as the display elements.
Display
The display serves:
To indicate the production machine speed
To indicate the minimum speed (in setting mode)
To indicate minimum and maximum pressure for the proportional
pressure control valves (in setting mode).
Fig. 4-8
LA 302
4
23
1
5
Operation
4-6
P/N 7119797A
2006 Nordson Corporation
LA 302
Issued 06/06
LED’s
The LEDs indicate the following:
LED Meaning
1 Illuminated in automatic mode when the required minimum
speed is exceeded; illuminated in manual mode.
2 Illuminated when one of the electropneumatic solenoid
valves on the adhesive gun has short-circuited or when
current > 1.6 A is flowing.
3 Illuminated when the production machine speed is below the
minimum speed set on the LA 302.
4 Illuminated when proportional pressure control valve 1 is not
connected or the connection is interrupted.
5 Illuminated when proportional pressure control valve 2 is not
connected or the connection is interrupted.
Fig. 4-9