efd 725da ユーザーガイド
Troubleshooting Guide
No fluid flow
•
If valve operating air pressure is
too low, the valve will not open.
Increase air pressure to 70 psi
(4.8 bar) minimum.
too low, the valve will not open.
Increase air pressure to 70 psi
(4.8 bar) minimum.
•
The reservoir air pressure may not
be high enough. Increase pressure.
be high enough. Increase pressure.
•
The dispensing tip may be clogged.
Replace tip.
•
The stroke adjustment may be
closed. Open stroke adjustment.
closed. Open stroke adjustment.
•
Fluid may have solidified in the fluid
body. Clean the fluid body.
body. Clean the fluid body.
•
Fluid supply line is installed in blind
mounting hole. Remove and reinstall
properly.
mounting hole. Remove and reinstall
properly.
Fluid drools after the valve closes,
eventually stopping
eventually stopping
•
This is caused when air is trapped
in the outlet section of the fluid
body or the fluid has entrapped air.
The air will expand after the valve
closes, causing extrusion until the
air reaches atmospheric pressure.
in the outlet section of the fluid
body or the fluid has entrapped air.
The air will expand after the valve
closes, causing extrusion until the
air reaches atmospheric pressure.
Purge the valve by dispensing at
a steady flow until clear. If a small
tip is used, it may be necessary
to remove the tip while purging to
obtain sufficient flow to carry the
air down through the tip adapter.
a steady flow until clear. If a small
tip is used, it may be necessary
to remove the tip while purging to
obtain sufficient flow to carry the
air down through the tip adapter.
•
If the fluid has entrapped air, the
material must be degassed before
dispensing
material must be degassed before
dispensing
.
Note: For stripes and lines, input air
pressure can be lowered to elimi-
nate opening surge.
pressure can be lowered to elimi-
nate opening surge.
Fluid drips at a steady rate after the
valve closes
•
A steady drip indicates failure of
the sealing head to close fully due
to particle buildup or wear. In either
the sealing head to close fully due
to particle buildup or wear. In either
case, replace the sealing head in
accordance with the maintenance
instructions.
accordance with the maintenance
instructions.
Valve responds slowly when
opening and closing
opening and closing
•
Valve response is related to control
air hose length and size. The EFD
valve is supplied with 5 feet of 1/8”
tubing attached. Any additional
length or size change will affect
response time. Check to be sure
the length and size have not been
changed.
air hose length and size. The EFD
valve is supplied with 5 feet of 1/8”
tubing attached. Any additional
length or size change will affect
response time. Check to be sure
the length and size have not been
changed.
Fluid flows out of the drain hole
•
Fluid flowing out of the drain hole
indicates a ruptured diaphragm.
Replace in accordance with the
maintenance instructions.
indicates a ruptured diaphragm.
Replace in accordance with the
maintenance instructions.
Inconsistent deposits
•
Inconsistent deposits can result
if the air pressure controlling the
valve and/or supplying the reservoir
is fluctuating or if the valve operating
pressure is less than 70 psi (4.8
bar). Check to be sure air pressures
are constant and the valve operating
pressure is 70 psi (4.8 bar).
if the air pressure controlling the
valve and/or supplying the reservoir
is fluctuating or if the valve operating
pressure is less than 70 psi (4.8
bar). Check to be sure air pressures
are constant and the valve operating
pressure is 70 psi (4.8 bar).
•
The time the valve is open must
be constant. Check to be sure
the valve controller is providing a
consistent output.
be constant. Check to be sure
the valve controller is providing a
consistent output.
A NORDSON COMPANY
USA: 800-556-3484 or +1-401-434-1680
Europe: 0800 585733 or +44 (0) 1582 666334
Asia: +86 (21) 5854 2345
technical@efd-inc.com
Europe: 0800 585733 or +44 (0) 1582 666334
Asia: +86 (21) 5854 2345
technical@efd-inc.com
www.efd-inc.com
©2006 Nordson Corporation 725DA-MAINT-01 v062606