Nordson_EFD_P-Jet_SolderPlus_Operating_Manual.pdf - 第27页

Liquidyn P-Jet SolderPlus Jet Valve 27 www.nordsonefd.com info@nordsonefd.com +1-401-431-7000 Sales and service of Nordson EFD dispensing systems are available worldwide. Parameter Settings (continued) Frequency (continu…

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 2ms.

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

Liquidyn P-Jet SolderPlus Jet Valve

28 www.nordsonefd.com info@nordsonefd.com +1-401-431-7000 Sales and service of Nordson EFD dispensing systems are available worldwide.

Tappet Adjustment

The valve is equipped with two mechanisms for tappet

adjustment:

• Force screw (non-slip knurled screw) — sets the dynamic

of the tappet movement.

• Stroke adjustment knob (ﬁne diamond knurl screw) —

sets the tappet stroke.

The factory settings for both mechanisms are appropriate for

most applications. However, depending on the dispensing

task and on the material, each can be adjusted to ﬁne-tune the

dispensing result.

CAUTION

When dispensing solder paste, do not adjust the tappet of a wetted and closed valve. Doing so can grind material

into the nozzle, causing nozzle clogging and other related problems. Refer to “Appendix C, Special Instructions for

Solder Paste Dispensing” on page47 for steps that apply only to solder paste dispensing.

Adjusting the Force Screw

Adjust the raster element (see NOTE below) and then turn the force screw clockwise (as seen from an aerial view)

to change the dynamic of the tappet movement. In most cases, simultaneously increasing the operating pressure is

helpful.

NOTE: Use the spring-loaded raster element as follows:

• Completely loosen the element to turn the force

screw.

• Half-tighten the element to hear a clicking sound

when you turn the force screw.

• Completely tighten the element to secure the force

screw.

To return the force screw to the factory setting:

1. Completely loosen the raster element.

2. Turn the force screw counterclockwise until it stops.

3. Turn the force screw clockwise for 25 clicks (15 clicks = one full turn).

4. Completely tighten the raster element to secure the force screw.

Stroke adjustment

knob

Force screw

Spring-loaded

raster element