Nordson_EFD_781RC_Operating_Manual.pdf - 第11页
If factory regulations require system shutdown during evening and / or weekends or after long periods of pump system shutdown, some settling may have occurred in your ink or paint. Before starting to spray mark, it will …
9. Once 781RC system is fully primed, set pump speed control to
approximately 9 o’clock — .
10. Using the button on the ValveMate controller, place the
controller in the mode.
In mode, channels and can be selected independently
without nozzle air pressure.
11. While in mode, depress button and adjust speed control to
set fluid flow rate to one or two drops per second.
NOTE: Flow adjustments should be made with speed control as
opposed to reductions of valve needle stroke. Tight valve stroke
settings will cause blockage / clogging of valve outlet.
12. Set the nozzle air pressure on the nozzle to 0.3 bar (5 psi) and
actuate the controller. Adjust higher as needed to create even
spray. The valve will produce a fine spray.
To change fluid flow, use the needle stroke control knob and / or
pump speed control. Maintain balanced settings. Do not set stroke
too tightly as this will cause nozzle clogging.
To change nozzle air, use the nozzle air pressure regulator. Higher
pressures will provide finer spray.
Initial Installation / Setup Procedures (continued)
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781RC MicroMark Recirculating Spray Marking System
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If factory regulations require system shutdown during evening and /
or weekends or after long periods of pump system shutdown, some
settling may have occurred in your ink or paint.
Before starting to spray mark, it will be important to remix / agitate your
fluid to return settled pigments back into solution.
To remix, follow these simple procedures.
1. Make certain pump is SHUT OFF.
2. Remove lid from reservoir and stir contents in liner until thoroughly
mixed. Replace lid.
3. Open pump box to access internal speed control. (Make notation
of speed control setting to return to this position after remix /
agitation procedure.)
4. Slowly turn Speed Control clockwise to the 2 o’clock–3 o’clock
position. This will dramatically increase flow volume.
5. Close pump box cover and turn pump ON.
6. Let fluid recirculate for 1–2 minutes. This should provide ample
recirculation of fluid in feed lines and spray valve.
* Important note: Do not cycle test the spray valve at this high flow
condition as this will result in excessive spray mark volume!
7. Shut OFF pump. Open pump box cover and return Speed Control
to original cycle setting — about the 9 o’clock position is
sufficient if prior setting is unknown.
8. Close pump cover. Turn pump ON.
9. Cycle test 781RC spray valve until desired spray mark occurs.
Recirculation System Startup Procedures after
Prolonged Periods of Downtime
781RC MicroMark Recirculating Spray Marking System
11www.nordsonefd.com info@nordsonefd.com +1-401-431-7000 Sales and service of Nordson EFD dispensing systems are available worldwide.
Maintenance and Cleaning
General Cleaning
1. Remove fluid filled container and replace with new liner.
2. Pour appropriate solvent / cleaner into new liner. Increase pump
speed control setting and valve stroke to increase fluid flow.
Circulate solvent through system.
NOTE: Select channel 1 or 3 for nozzle air OFF operation during
initial cleaning cycle.
3. After a few minutes of circulation, place container under valve and
purge solvent from 781RC valve until tank runs nearly dry.
4. Repeat process with fresh solvent to clean system completely.
5. System should now be ready for next spray process.
Disposal of Discarded Wetted Materials
The user should consult local jurisdictional requirements for the proper
disposal of all discarded material.
Calibration Feature
The stroke control reference ring of each 781S-SS valve is factory
calibrated to the zero position. After cleaning, disassembly and
reassembly, the stroke control zero position may require recalibration.
To do so:
1. Make a note of the current stroke setting number.
2. Turn the calibration adjustment knob (inner) counterclockwise two
full turns.
3. Turn the stroke knob (outer) clockwise until it stops. Note reference
ring “0” (zero) location. If “0” is not positioned above either
reference mark on air cylinder body, rotate outer stroke knob
counterclockwise until “0” is positioned above preferred reference
mark. Select reference mark that is more clearly visible based on
valve mounting location.
4. Insert 1/8" hex allen wrench (included) into calibration adjustment
knob.
5. Turn the calibration adjustment knob clockwise until it stops. The
stroke adjustment is now calibrated to zero.
6. Reset stroke to the required position noted in step 1.
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781RC MicroMark Recirculating Spray Marking System
12 www.nordsonefd.com info@nordsonefd.com +1-401-431-7000 Sales and service of Nordson EFD dispensing systems are available worldwide.