Nordson-EFD-794-Operating-Manual.pdf - 第11页
794 Series Auger Valve | Operating Manual 11 www.nordsonefd.com info@nordsonefd.com +1-401-431-7000 Sales and service of Nordson EFD dispensing systems are available worldwide. T r oubleshooting Problem Possible Cause So…
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
Continued on next page
794 Series Auger Valve | Operating Manual
12 www.nordsonefd.com info@nordsonefd.com +1-401-431-7000 Sales and service of Nordson EFD dispensing systems are available worldwide.
Troubleshooting (continued)
Problem Possible Cause Solution
Inconsistent
deposits
Poor material cut-off Reverse motor briefly at end of deposit routine
Switch to chamfered tip
Tip too large Change to smaller (larger number) tip
Gap too small Increase gap
Inconsistent material Replace and / or mix material
Air in material Run one or more purge routines until cleared
De-air material (vacuum or centrifuge)
Premature retraction Increase dwell time
Process temperature changing Install temperature control system, such as the EFD
ProcessMate
®
6500 temperature controller
Damaged tip Replace tip
Leaking at fittings Fittings loose Tighten fittings
Hose loose on fittings Replace hose
Fitting(s) cracked Replace barbed fitting(s) (Recommended: P/N 7014845)
Material incompatibility Switch to optional metal fittings (P/N 7021724)
Leaking at auger Worn or damaged auger seal Replace auger seal
Material being
damaged
Bent auger Replace auger
Worn auger bearing Replace auger bearing
Residual material
at material change-
over
Dead spots in material path at
barbs
Switch to optional metal fittings (P/N 7021724)