Nordson_EFD_781RC_Operating_Manual.pdf - 第7页
Intr oduction 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 settl…
ENCLOSURE
Cabinet Size (Length x Width x Depth): 25.4 x 20.3 x 10.2 cm (10 x 8 x 4")
Weight: 6.5 kg (14 lb, 6 oz)
Input AC (to power supply): 100–240 VAC ~ 50/60 Hz
Output Voltage (from power supply): 24 VDC — 2.7 Amp maximum
Power Requirements: 24 VDC — 2.0 Amp maximum
Ambient Operating Conditions: Temperature: 5° C to 45° C (41° F to 113° F)
Humidity: 85% RH at 30° C non-condensing
Height above sea level: 2000 meters max. (6562 ft)
NEMA Rating: Type 12 and 13
PUMP
Flow Capacity: Up to 88 liters per hour
Weight: 0.385 kg (13.6 oz)
Dimensions (Length x Max. Diameter): 130.5 x 56 mm (5.14 x 2.20")
Power Input: 24 VDC — 2.0 Amp maximum
Wetted Materials*: Pump body: 303SS
Gears: PEEK
Gasket: PTFE
Speed Control Signal: 0–10 volts DC
Pump Drive: Magnetic coupling
*Refer to specifications page in 781S installation guide for reference to wetted materials.
NOTE: Specifications and technical details are subject to engineering changes without prior notification.
Specifications
781RC MicroMark Recirculating Spray Marking System
6 www.nordsonefd.com info@nordsonefd.com +1-401-431-7000 Sales and service of Nordson EFD dispensing systems are available worldwide.
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.