Nordson_EFD_P-Jet_SolderPlus_Operating_Manual.pdf - 第26页
Liquidyn P-Jet SolderPlus Jet Valve 26 www.nordsonefd.com info@nordsonefd.com +1-401-431-7000 Sales and service of Nordson EFD dispensing systems are available worldwide. Parameter Settings The following table provides r…
Liquidyn P-Jet SolderPlus Jet Valve
25www.nordsonefd.com info@nordsonefd.com +1-401-431-7000 Sales and service of Nordson EFD dispensing systems are available worldwide.
Initial Startup
This section provides recommendations for system startup and operation. System startup for the valve depends on
the control unit. If you are using a Nordson EFD Liquidyn valve controller, obtain the controller manual. If you are
using higher-level controller, the control is set up by the customer.
CAUTION
Before switching on the system, ensure that all electrical and pneumatic connections are connected correctly and
fully functioning.
1. Check electrical and pneumatic connections.
2. Switch on the control unit.
3. Turn on the air supplies.
4. (Solder paste applications only) If using the P-Jet SolderPlus valve in a solder paste dispensing
application, refer to “Appendix C, Special Instructions for Solder Paste Dispensing” on page47 for
steps that apply only to solder paste dispensing.
5. (All applications except solder paste applications) Use the following actions to set up and test the valve
operation using the control system manual or the customer-supplied control system and documentation. Refer
to “Parameter Settings” on page26 for information and recommendations on system setup.
a. Trigger the valve until the material to be dispensed leaves the nozzle opening. Place a collecting container or
paper sheet underneath the valve.
b. Clean the nozzle tip with a lint-free cloth.
c. Set the distance between the nozzle and the target (such as a sample product).
d. Initiate several dispense cycles to test the valve operation.
e. Evaluate the dispensing results and make adjustments until the desired dispensing performance is achieved.
Refer to “Parameter Settings” on page26 and to “Recommended Setup Adjustments” on page27 for
detailed information on system setup and adjustment.
6. To ensure optimal valve performance, maintain the system as described under “Service” on page30.
Liquidyn P-Jet SolderPlus Jet Valve
26 www.nordsonefd.com info@nordsonefd.com +1-401-431-7000 Sales and service of Nordson EFD dispensing systems are available worldwide.
Parameter Settings
The following table provides recommended settings for initial startup and testing of the valve operation. Detailed
information on each parameter is shown after the table.
Parameter Description Recommendation
Pulse Time The electrical trigger pulse of the valve, starting at 2 ms. 6 ms starting value
Frequency The number of tappet movements per second. 10Hz starting value
Fluid pressure The flow rate of the material supply; should be set to produce a
consistent volume.
1.0 bar (14.5 psi)
starting value
Operating pressure The setting of the tappet force screw; can be adjusted to fine-tune
the dispensing result.
6 bar (87 psi) starting
value
Stroke adjustment The setting of the stroke adjustment knob, which changes the
vertical movement of the tappet.
Do not adjust
Nozzle heater
temperature
If applicable, the temperature setting for the nozzle heater. 36 °C (98.8 °F) when
open
Pulse Time
The Pulse Time corresponds to the electrical trigger pulse, or opening time, of the valve, which is the primary control
of deposit size. The following conditions apply to Pulse Time:
• The pneumatically actuated dispensing nozzle remains
open as long as it is triggered.
• The dispensing volume is affected by the adjustment of
the triggering pulse.
• The minimum Pulse Time is 2 ms. The valve cannot
operate correctly at Pulse Times below 2ms.
Frequency
Frequency is the number of tappet movements per second.
A dispensing cycle consists of the Pulse Time and the pause time.
Physical Quantity Formula Unit
Frequency (f) f = 1 / T 1Hz (hertz) = 1 / s
Dispensing cycle T = 1 / f 1 s (second) = 1 / Hz
1 ms = 0.001 s (second)
Higher-level controllers may not allow you to enter the exact frequency. If such cases, frequency is set using the
length of the pulse and the pause time.
Liquidyn P-Jet SolderPlus Jet Valve
27www.nordsonefd.com info@nordsonefd.com +1-401-431-7000 Sales and service of Nordson EFD dispensing systems are available worldwide.
Parameter Settings (continued)
Frequency (continued)
EXAMPLE:
• To achieve 50Hz with a 2 ms Pulse Time, set the pause time to 18 ms.
• To achieve 50Hz with a 10 ms Pulse Time, set the pause time to 10 ms.
Pulse time Pause time
Dispensing cycle
Fluid Pressure
The fluid pressure must be properly set to ensure that material is supplied at a consistent volume. Consider the
following when setting the fluid pressure:
• The fluid pressure must stay within the tubing pressure specifications.
• Fluid supply tubing must be resistant to chemicals.
• The fluid pressure must be high enough for the material to exit the nozzle opening.
• The required fluid pressure will vary depending on the material, its viscosity, and the ambient temperature.
• Decreasing the fluid pressure too much may, in extreme cases, prevent proper deposit separation from the
nozzle.
• Prevent pressure fluctuations. Note that pressure loss due to friction occurs as material flows through the
material delivery components.
Recommended Setup Adjustments
The following table provides recommended adjustments to help you quickly find optimum system settings
for your application. Because of the diversity in materials that can be dispensed, the effectiveness of these
recommendations can vary, but they serve to share our experience with you.
Goal Operating Pressure
Tappet
Force Screw
Adjustment
Fluid Pressure
Heater
(Temperature)
Nozzle Orifice
Diameter
Smaller dots Not applicable Down Down Down Down
Bigger dots Not applicable Up Up Up Up
Prevent satellites Down Up Down Down Up
Prevent residue at
the nozzle
Up Down Down Up Not applicable
Key:
Down = lower operating pressure or temperature / tighten screw / smaller diameter
Up = greater operating pressure or temperature / loosen screw / larger diameter