Nordson_EFD_781RC_Operating_Manual.pdf - 第12页
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 …
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.
Pump Maintenance and Cleaning (Fluid Side)
1. Disconnect electrical power from enclosure.
2. Remove tubing from pump fittings.
3. Remove pump from motor housing by removing the 3mounting
screws.
4. Remove 3 long screws from front of pump housing to
disassemble wetted components of pump.
5. Inspect PEEK gears and PTFE gaskets for wear / damage.
Replace as necessary using P/N 7014378* Pump Rebuild service
kit.
6. Clean any surfaces / orifices of fluid residues.
7. Reassemble in reverse order of disassembly.
*Includes PTFE gaskets, PEEK gears/SS shafts, and bushings.
Maintenance and Cleaning (continued)
781RC MicroMark Recirculating Spray Marking System
13www.nordsonefd.com info@nordsonefd.com +1-401-431-7000 Sales and service of Nordson EFD dispensing systems are available worldwide.