Nordson_EFD_781RC_Operating_Manual.pdf - 第8页
Setup Electric Air Constant Air Pulse Fluid 1 2 3 4 5 6c 9 10 5 7 7 787MS-SS-RC 781RC 781RC MicroMark Recirculating Spray Marking System 8 www.nordsonefd.com info@nordsonefd.com +1-401-431-7000 Sales and service of Nords…
Introduction
How the System Operates
The 781RC MicroMark
®
Recirculating Spray Marking System was
designed specifically to deal with pigmented inks and similar liquids that
have a tendency for solids within them to settle out of solution. The main
concern with settling is that the solids tend to clog the output of the
spray valve, especially at low flow settings. The 781RC system prevents
clogging and allows the user to set the valve to low flow values.
Unlike many other spray valve systems, the 781RC Recirculation
System does not use compressed air to create system pressure and
flow. Instead, it uses a gear pump driven by a brushless direct current
electric motor. The motion of the gear pump keeps the ink mixed, and
since it is a positive displacement pump, the liquid is constantly moving.
The flow in the system is controlled by the speed of the motor, which
is adjusted by a potentiometer within the pump enclosure. The internal
flow path geometry within the 781RC* spray valve helps to prevent
settling as well. When the valve is not spraying, the flow path in the
fluid body keeps the liquid from stopping within the valve. Lastly, the
return line is oriented within the reservoir to promote mixing and prevent
settling.
*The 781RC system is also available with a 787MS-SS-RC MicroSpray
™
valve. Contact EFD for details.
Before You Begin — Power Input Options
Electrical connection options for pump enclosure assembly
+24 volt DC input for direct
wiring of pump enclosure from
a factory supplied 24 volt bus.
Screw type connection terminal
block.
Ground connection
from the 24 volt bus.
External power supply
input connector for
universal power supply
kit P/N 7013911.
781RC MicroMark Recirculating Spray Marking System
7www.nordsonefd.com info@nordsonefd.com +1-401-431-7000 Sales and service of Nordson EFD dispensing systems are available worldwide.
Setup
Electric
Air Constant
Air Pulse
Fluid
1
2
3
4
5
6c
9
10
5
7
7
787MS-SS-RC
781RC
781RC MicroMark Recirculating Spray Marking System
8 www.nordsonefd.com info@nordsonefd.com +1-401-431-7000 Sales and service of Nordson EFD dispensing systems are available worldwide.
Initial 781RC Installation / Setup Procedures
Prior to installing this system, please read the associated spray valve
and valve controller operating instructions to become familiar with the
operation of all components of the spray system. Select an appropriate
system setup location for all system components — pump enclosure
assembly, 1-liter reservoir, ValveMate 8040, and 781RC* Spray Valve.
*The 781RC system is also available with a 787MS-SS-RC MicroSpray
™
valve. Setup is exactly the same regardless of the valve type.
Important Note: Turn pump enclosure power switch to OFF and
ensure speed control is turned fully counterclockwise to OFF
position.
1. Cut feed tube hose to desired length and install into tank lid outlet
port. Insert tube to bottom of tank liner. Cut tube at slight angle to
avoid fluid blockage at bottom of tank.
2. Connect the fluid supply line from tank outlet to pump inlet
compression fitting.
3. Connect the fluid line from pump outlet to the 781RC inlet port
compression fitting.
4. Cut recirculation feed hose to desired length and install into tank lid
recirculation port. Insert recirculation hose to bottom of 1-liter liner.
Cut tube at slight angle to avoid fluid blockage at bottom of tank.
Attach other end to 781RC recirculation port outlet compression
fitting.
5. Connect the control air hose and the nozzle air hose to
corresponding outputs on solenoid block. Reference ValveMate
8040 Quick Start Guide.
6. Fill reservoir by pouring fluid directly into tank liner or
manufacturer’s bottle placed inside reservoir. Secure cover.
a. Confirm the speed control knob is OFF by turning fully
counterclockwise.
b. Set ValveMate 8040 to mode.
c. Turn pump enclosure power switch to ON.
7. Turn 781RC valve stroke to no less than 1/2 turn or more open.
Priming the pump. (Important Note: Dry running time should be
kept to an absolute minimum.)
8. During initial startup / priming, keep pump speed LOW
(approximately 9 o’clock position) until fluid reaches the pump and
begins to recirculate to the 781RC Spray Valve. Increase pump
speed after initial prime to accelerate recirculation.
NOTE: Make changes to pump speed slowly to avoid surge loads
on external power supply.
Setup steps 9, 10, 11, and 12 continued on next page.
781RC MicroMark Recirculating Spray Marking System
9www.nordsonefd.com info@nordsonefd.com +1-401-431-7000 Sales and service of Nordson EFD dispensing systems are available worldwide.