Nordson-EFD-794-Operating-Manual.pdf - 第10页
794 Series Auger Valve | Operating Manual 10 www.nordsonefd.com info@nordsonefd.com +1-401-431-7000 Sales and service of Nordson EFD dispensing systems are available worldwide. Solder Paste Nordson EFD’s comprehensive li…
794 Series Auger Valve | Operating Manual
9www.nordsonefd.com info@nordsonefd.com +1-401-431-7000 Sales and service of Nordson EFD dispensing systems are available worldwide.
Changing the Auger Assembly
1. Do the following to disconnect the fluid supply:
a. Loosen the barrel clamp.
b. Raise the barrel.
c. Disconnect the tubing from the fluid inlet fitting
5
and pull it out through the slot in the clamp.
2. Push back the lever
2
on the valve fluid body.
The entire auger assembly
3
drops out of the fluid body.
3. Remove the fluid inlet fitting
5
and tip/retaining nut
4
from the auger assembly and install these components on
the replacement auger assembly.
4. Insert the hex drive of the replacement auger assembly
into the valve fluid body
1
, rotate the auger assembly
until the hex engages, and then push up until the auger
assembly snaps into place.
5. Reconnect the fluid supply and restore the barrel and
barrel clamp to the normal operating position.
Changing a Tip
1. Loosen and remove the tip retaining nut
1
.
2. Remove the tip and install the replacement tip
2
(1/4"only).
3. Reinstall and tighten the tip retaining nut.
NOTES:
• To ensure proper axial location of the tip, tighten the cap
on the fine-adjust assembly until it bottoms out firmly
against the end of the auger assembly.
• Use only EFD 1/4" long tips, tip sizes 7018029 through
7018462. Refer to the EFD Precision Dispense Tip Sheet
for available gauge sizes and dimensions.
1
2
2
3
4
1
5
794 Series Auger Valve | Operating Manual
10 www.nordsonefd.com info@nordsonefd.com +1-401-431-7000 Sales and service of Nordson EFD dispensing systems are available worldwide.
Solder Paste
Nordson EFD’s comprehensive line of ISO-certified solder paste solutions include high quality printing and dispensing
soldering pastes that meet the most stringent application requirements. Visit www.nordsonefd.com/SolderPlusPaste for
details or to request a free sample.
Service
Refer to the 794 Service & Replacement Parts Manual for service procedures.
Valve Part Numbers
Part # Pitch Model Description
7029745 8 794-FR Auger valve, 8 pitch, brush motor, fixed head
7029746 16 794-FR Auger valve, 16 pitch, brush motor, fixed head
Replacement Parts
Refer to the 794 Service & Replacement Parts Manual for replacement parts.
794 Series Auger Valve | Operating Manual
11www.nordsonefd.com info@nordsonefd.com +1-401-431-7000 Sales and service of Nordson EFD dispensing systems are available worldwide.
Troubleshooting
Problem Possible Cause Solution
Auger not turning Wiring fault Check accuracy and tightness of all connections
Cable damaged Check cable for damage, replace if necessary
Controller fault Check controller output with voltmeter; refer to “Specifications”
on page6.
Controller set incorrectly Check settings of controller: motor voltage, direction, dispense
duration; refer to “Specifications” on page6.
Motor fault Contact your Nordson EFD representative for assistance.
Auger jammed Clean auger assembly
Coupling loose Tighten set screws
No deposit Motor turning in wrong direction
(should be clockwise when
viewed from above)
Check controller motor direction settings
Reverse motor wires
Depleted barrel Replace with filled barrel
No air pressure Check controller input air and air settings
Material cured or dried Replace with fresh material
Insufficient air pressure Increase pressure
Delivery path clogged Run one or more purge routines
Clean delivery path
Replace tip, supply hose and / or fittings
Smeared deposits Automated dispensing system
hunting for position
Tune the automated dispensing system. Contact your Nordson
EFD representative for assistance.
Slide position not settled Increase settling and / or dwell times. Decrease velocity and / or
acceleration rates
Valve loose Tighten mounting connections
Automated dispensing system
fault
Service the automated dispensing system. Contact your
Nordson EFD representative for assistance.
Skipped deposits Automated dispensing system
fault
Service the automated dispensing system. Contact your
Nordson EFD representative for assistance.
Switch to chamfered tip
Tip too small Change to larger (smaller number) tip
Gap too large Decrease gap (turn ring counter clockwise)
Inconsistent material Check and / or mix material
Air in material Run one or more purge routines
De-air material (vacuum or centrifuge)
Damaged tip Replace tip
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