LA 302 Pressure Controller Manual.pdf - 第34页

LA 302 C F A LA 30 2 A D G Operation 4-4 P/N 71 19797A 2006 Nordson Corporation LA 302 Issued 06/06 Setting Minimum Pressure (Potentiometer C) Potentiometer (C) is used to set the minimum pressure for proportional pressu…

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LA 302
A
LA 302
A
E
3
Operation
4-3
P/N 7119797A
2006 Nordson Corporation
LA 302
Issued 06/06
The LA 302 calculates the pressure values on the basis of the production
machine speed. For the display to be correct:
The encoder must be installed (Use suitable gear box)
The maximum speed may not exceed 600 m/min.
Turn the mode switch (A) to the top position to display the production
machine speed.
NOTE: To check, change the production machine speed and observe the
display.
Fig. 4-3
Setting Minimum Speed (Potentiometer E)
Potentiometer (E) is used to set the minimum speed. Pressure is not
controlled below this speed. If pneumatic valves are connected, their
nozzles are not opened below the minimum speed. If the production
machine falls below the speed set on the LA 302, LED (3) lights up.
1. Reduce the production machine speed to the desired lowest speed (but
not < 1 m/min).
2. Set mode switch (A) to Minimum speed.
3. Set the minimum speed with potentiometer (E) on the LA 302.
4. Lock the setting with the fixing device on potentiometer (E).
NOTE: Ensure that the production machine speed is always somewhat
higher than the set minimum speed.
Fig. 4-4
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
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