SC_450 PreciseCoat Conformal Coating Jet_Rev_04.pdf - 第20页

SC-450 PreciseCoat C onformal C oating J et Installation an d Configuration 14 © 2024 Nordson Corporation 5. Select th e SC-450 tool. > The Pressure Outpu ts window opens . 6. Slide the pressur e bars to achieve the s…

SC-450 PreciseCoat Conformal Coating Jet Installation and Configuration

3.7 SC-450 EasyCoat Configuration

To configure EasyCoat for the SC-450:

1. Configure the EasyCoat software for the SC-450. Refer to the EasyCoat User Guide or

EasyCoat Help for software configuration.

2. Position the SC-450 at the purge cup by running the appropriate macro or moving the

SC-450 to the front of the machine.

3. Click on Edit > Edit Mode from the EasyCoat Operator Screen to open the Edit Screen.

4. From the EasyCoat Edit Screen, select Utilities > Pressure Adjust > SC450 (Figure 3-7).

Figure 3-6 Utilities - Pressure Adjust

SC-450 PreciseCoat Conformal Coating Jet Installation and Configuration

5. Select the SC-450 tool.

> The Pressure Outputs window opens.

6. Slide the pressure bars to achieve the suggested starting pressures (Figure 3-8):

a. Set Heater Fluid Temperature to 35 °C.

b. Choose one of the two (2) operating modes SC450 Bead or SC450 Jet.

1) Set Actuation Pressure to 551 kPa (80 psi).

2) Set Fluid Pressure to 103 kPa (15 psi).

c. Set stroke to 25 clicks open.

7. Perform a priming routine. Refer to the applicable coating system Installation, Operations,

and Maintenance Manual.

Figure 3-7 Pressure Outputs

4 Operation

4.1 Overview

This SC-450 PreciseCoat Jet is designed for use on Nordson Select Coat Series Coating Systems. For

complete system operating procedures, refer to the applicable coating system Installation, Operations,

and Maintenance Manual. This section covers the following topics:

•

Theory of Operation

•

Application Settings

•

Control

Components

•

Hardware Selection

4.2 Safety First

Operation of the SC-450 PreciseCoat Jet involves air pressure, electrical power, mechanical devices, and

the use of hazardous materials, and sometimes may involve heat. It is essential that every person

servicing or operating the PreciseCoat Jet fully understands all hazards, risks, and safety precautions.

See Section 2 - Safety for additional information.

WARNING!

Allow only qualified personnel to perform the following tasks. Follow the safety

instructions in this document and all other related documentation.

4.3 Theory of Operation

The SC-450 PreciseCoat Jet is a normally closed, air-actuated, spring-return mechanism, which uses

momentum transfer principles to expel precise volumes of material. Pressurized air is regulated by a high-

speed solenoid to retract the needle assembly from the seat. Fluid, fed into the fluid chamber, flows over

the seat. When the air is exhausted, the needle travels rapidly to the closed position, displacing fluid

through the seat and nozzle in the form of a droplet. Multiple droplets fired in succession can be used to

form larger dispense volumes and lines when combined with the motion of a dispenser robot.

4.4 Control Components

The following features affect performance of the SC-450 and are typically adjusted to fit your application.

Contact Technical Support for additional information.

4.4.1 Dot and Line Parameters

In addition to the SC-450 hardware configuration and settings, valve timing and coating instructions are

set in the EasyCoat software program to control the frequency and speed of dots and lines dispensed.

For information on dispense parameters, refer to the EasyCoat User Guide or EasyCoat Help.

4.4.2 Fluid Pressure

Fluid pressure should be set so that fluid fills to the seat, but should not be influential in pushing the fluid

through the seat and nozzle. In general, fluid pressure should be set according to the viscosity of the fluid

dispensed, see Table 4-1.

4.4.3 Drive Needle and Fluid Needle

Drive needle and fluid needle geometries are typically the main factors controlling volume. Size is

determined based on fluid properties. Other parameters, like stroke and fluid pressure fine tune the

application. Sizes are listed in Item 20 through Item 22.