TS7000-user-guide.pdf - 第5页

12 11. TROUBLESHOOTING PROBLEM POSSIBLE CAUSE CORRECTION No Material Flow Dispense tip is plugged Replace tip Motor does not receive signal Make sure all connections ar e secured Motor running in reverse Reverse motor ca…

2. UNPACKING AND INSPECTION

Carefully unpack the valve and examine the items contained in the carton.

Inspect the unit for any damaged which may have occurred in transit. If such

damage has occurred, notify the carrier at once.

3. DESCRIPTION

The TS7000 series Cartridge Rotary Valves are the latest addition to the Rotary

Microvalve family. The valve uses a feed screw (auger) to dispense material

with a rotary displacement action, allowing ultra-precise control of the

dispensing process. The valve’s modular design allows quick and easy

replacement of feed screw/chamber cartridge without the need of removing the

main valve from the machine. In addition, the valve can be interchanged to

use with TS5000DMP feed screw inserts.

The TS7000 series valve is available in 3 choices of feed screw sizes (16-pitch,

8-pitch and high output 8-pitch), all made of precision hardened tool steel.

Encoder motor version available for applications required closed-loop motor

control with encoder feed back.

4. THEORY OF OPERATION

The TS7000 Series Rotary Microvalve dispenses material with a rotary

displacement action using a rotary feed screw principle. Material is held in a

feed reservoir (2) under a positive head of air pressure, between 1 to 30 psi,

depending upon the viscosity of the material. This positive air pressure,

supplied by the air line (1), forces the material out of the barrel (2) into the

material feed path (3) then to the feed screw/chamber assembly (4). Material

flows from this point (4) to the dispense needle outlet is controlled by the feed

screw rotation in the feed direction. The feed screw is driven by the DC motor

(5). Applying a DC voltage signal to the DC motor (5), will rotate the feed

screw and the material will be forced out the dispense tip. The actual material

deposited is dependent upon adhesion of the dispensed material to the substrate.

Shearing of the material is achieved by reverse Z-motion (tip retraction). When

the motor stops, the unit remains in position for a fraction of a second (dwell)

to allow the last drop of material to flow out of the dispense tip. After the

dwell period, the automation equipment moves the valve to the next position.

Figure 2.0

Dispense tip

clogged

Tip contacting substrate Increase dispense tip height

Tip bent or damaged Replace tip

Particles size in material too

big

Replace with larger ID tip

12. SPARE PARTS AND ACCESSORIES

12.1 SPARE PARTS: COMPLETE VALVE ASSEMBLY

Table #1 Motor Option

Part Number Description

TSD1412-22 Motor, 6W, 400RPM

TSD1412-31 Encoder Motor, 6W, 400RPM

7090-0040

7090-0020

7090-0050

7090-0010

2800-0213

7090-0060

2800-0423

See Table #1 below

See Table #2 below

See Table #3 below

TSD1109-1

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