TS7000-user-guide.pdf - 第6页

6 5.3 Air connection: Filtered air supply must be precisel y regulated and should be set between 1-30 psi, depending on material viscosit y. The air supply is not used as the main dispensing forc e. It is o nly required …

11. TROUBLESHOOTING

PROBLEM POSSIBLE CAUSE CORRECTION

No Material Flow

Dispense tip is plugged Replace tip

Motor does not receive

signal

Make sure all connections are

secured

Motor running in reverse

Reverse motor cable

connection

Barrel of dispense material

is emptied

Replace with new material

barrel

Material feed pressure is too

low

Increase feed pressure.

Material dried or cured

Replace with new fresh

material

Inconsistent

Shot size

Material pressure

fluctuating

Make sure material pressure is

constant

Valve on time is too short Increased valve on time

Excessive motor reverse

time

Reduce reverse time or turn off

completely.

Air trapped in material Purge valve properly

Feed screw damaged Replace feed screw

Skipped dots Air trapped in material De-air material

Material drools

after the valve

turned off

Air trapped in feed screw

chamber

Purge valve properly

Air trapped in material

reservoir

Remove air from reservoir

Excessive material feed

pressure

Reduce pressure or turn off

pressure when the valve is

idled.

5. SETUP INSTRUCTIONS

5.1 Mechanical Mounting:

Normally, the TS7000 valve is used on an automated XYZ table with full

motion control in the three planes. It is very important that the valve be

mounted on the Z-axis gantry in a secure manner that will not allow

loosening during dispense operation. The Z-axis must move in a precise

and repeatable motion for successful dispensing.

The provided mounting bracket, or customer supplied bracket, must be

attached to the Z-axis in a manner that will provide the valve

perpendicular travel to the horizontal plane of the surface on which the

material will be dispensed. The mounting should provide a means of

accurately adjusting the gap between the dispense tip and the substrate

surface such as a touchdown sensing device or a fixed distance standoff.

5.2 Electrical Connection:

The TS7000 series valve requires an electrical connection of two wires

for the DC motor. The motor lead wires are 24” long. The black lead

wire should be connected to the negative or neutral lead from the motor

control voltage source. To verify the connection, check the rotation

direction of the feed screw. When correctly connected, a positive voltage

signal will drive the feed screw in a counter clockwise direction when

viewed from the dispense tip end.

The recommended controller for the TS7000 series valve is the TS500R.

If another controller is used make sure the control voltage signal is

precisely controlled. The signal should be from a regulated power supply

and should be shunted to positive motor stop. Below is a diagram of a

simple braking circuit:

Figure 3.0

5.3 Air connection:

Filtered air supply must be precisely regulated and should be set between

1-30 psi, depending on material viscosity. The air supply is not used as

the main dispensing force. It is only required to move the material to the

feed screw chamber.

The valve is supplied with sample of 10 and 30cc air powered syringe

assembly. The syringe of material can be mounted directly onto the

valve inlet fitting. Material can also be supplied from a remotely located

container, such as cartridge systems.

Figure 4.0 Typical Setup Systems

6. DISPENSING APPLICATIONS

6.1 DC Motor Voltage Level:

Voltage controls motor speed (RPM). High voltage produces high motor

speed and low voltage reduces motor speed. Maximum Voltage input is

24 VDC

6.2 Feed screw pitch:

Rate of material dispensed is determined by the pitch of the feed screw. A

high pitch number will produce a low dispense rate and a low pitch

number will produce a higher dispense rate.

6.3 Dispense tip:

The size of the dot diameter or bead width is determined by the dispense

tip. A low gauge number (larger I.D.) will dispense a large diameter dot

or a wide bead. A high gauge number (smaller I.D.) will dispense a

smaller diameter dot or a narrower bead.

Dispense tip sizes smaller than 25-gauge and longer than 1/2" are not

recommended to use with solder paste. A normal rule of thumb to choose

the dispense tip size is that the dot size equal 1.5 times the internal

diameter of the dispense tip.

TS500R CONTROLLER

TS7000 VALVE

TO AIR SOURCE

AIR MUST BE

FILTER AND DRY

Figure 7.0

1. Follow steps 1-6 in Section 10.1 “Valve Purging”

2. Follow steps 1- 5 in Section 7.1 “Removing the Cartridge assembly”

3. Remove the Material Inlet Fitting (7) along with the Luer Lock

adapter (8) and Luer Lock Elbow fitting (9) from the Cartridge

4. Remove the Cartridge Cap (1) by turning it counter clockwise

5. Pull the Feed Screw (3) straight out of the Cartridge; Make sure not

to lose the upper bearing washer (2)

6. Using the tweezers (provided in the cleaning kit) to remove the lower

bearing washer (4)

7. Using a cotton swap, carefully remove the seal (5) from the cartridge.

8. Clean all parts using the cleaning brush with any suitable solvent

9. Inspect parts for wear or damage and replace if necessary

10. Re-install the seal (5) into the Cartridge body, make sure the spring

side is facing down

11. Fully press the lower bearing (4) washer into the Cartridge body

12. Insert the Feed Screw (3) into the Cartridge body, make sure not to

damage the seal

13. Install the upper bearing washer (2) on the Feed Screw flange

14. Tighten the Cartridge Cap (1)

15. Install the Material Inlet Fitting (7)

16. Install the Cartridge assembly into valve housing

17. Purge Valve per Section 10.1

2. Remove the two bracket mounting screws (5) and pull the valve

housing (7) away from the main housing (6)

3. Install a square drive adapter (include in the 7000-DMPBKIT) to the

flexible coupling (4) and tighten the set screw

4. Install the DMP bracket (include in the 7000-DMPBKIT)into the

main housing (6)

5. Install the DMP valve housing to the valve bracket

10. MAINTENANCE AND CLEANING:

10.1 Valve Purging:

Purging the valve with dispensing conditioner (7105XCON) between

shifts or after every eight hours of dispensing is recommended. The

conditioner cleans any material residue from the material path and

conditions the valve for future use.

1. Release material pressure.

2. Remove barrel of material from the valve.

3. Remove dispense tip

4. Install a barrel of dispensing conditioner (Part number 7105XCON)

to the valve inlet and set air pressure at 8.0 psi.

5. Turn on the valve and let it run until the conditioner is the only

material being dispensed at the valve outlet. If the conditioner is

unable to force the dispense material out the valve outlet then

proceed to the “Thorough Cleaning” section.

6. Turn off valve and release air pressure.

10.2 Thorough Cleaning:

Through cleaning procedures should be done whenever the following occur:

• Dispense material is changed to different type

• Dispense material started to cure in the valve

• Valve has been dispensing for one month.

• Dispense tip clogged frequently

6.4 Material feed pressure:

The material feed pressure does affect the amount of material dispensed

through the valve. Optimum feed pressure is dependent upon viscosity of

material dispensed. Only in unusual circumstances should the feed

pressure exceed 30 psi.

6.5 Dispense Material:

The viscosity of the dispense material along with the particulate additives

to the dispense material will also determine the dispense rate. Ability to

dispense may be directly related to the material formulation.

6.6 Dispense cut off:

The best method of stopping material flow at the end of the cycle is to

short the motor (grounding the DC voltage signal through a current

limiting resistor). This method provides a complete rotational brake of the

motor at the shut off point. Another method of stopping material flow is

to reverse the motor rotation by reversing the DC voltage signal. This can

be described as suck-back action. In both cases, a no-drip dispensing

action can be achieved. Turning off the material feed pressure when the

valve is not dispensing will prevent dripping and oozing.

6.7 Dispense tip height:

The distance between the dispense tip and substrate surface is extremely

important. To obtain accurate dot size, the dispense tip height should

remain constant for each dot/bead. If the dispense tip height fluctuates

during dispense process, the dot/bead size will vary. If the dispense tip

touches the dispense surface, clogging will occur.

6.8 Material condition:

The physical condition of the dispense material is very important to

successful dispensing. There are a number of conditions that can prevent

continuous and consistent dispensing such as:

• Freshness: Old material (most materials have a recommended shelf

life) leads to erratic dispensing and frequent clogging, especially with

solder paste. Make sure to check the material shelf life before

starting dispensing.

• Separation: Material with high content of solid particles, such as

solder paste, tends to separate at high pressure. If the dispense

material starts to separate, please replace it with new fresh material.

• Particles sizing: Do not attempt to dispense solder paste with particle

sizes bigger than 75 microns (-200+325 mesh size).