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Nordson RA-20 Manual

Nordson RA-20 Manual

Rotary atomizer
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RA-20 Rotary Atomizer
Customer Product Manual
Part 237366-06
Issued 7/19
For parts and technical support, call the Industrial Coating
Systems Customer Support Center at (800) 433-9319 or
contact your local Nordson representative.
This document is subject to change without notice.
Check http://emanuals.nordson.com for the latest version.
FM
C
US
APPROVED
NORDSON CORPORATION • AMHERST, OHIO • USA

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  • Page 1 For parts and technical support, call the Industrial Coating Systems Customer Support Center at (800) 433-9319 or contact your local Nordson representative. This document is subject to change without notice. Check http://emanuals.nordson.com for the latest version. APPROVED NORDSON CORPORATION • AMHERST, OHIO • USA...
  • Page 2 Contact Us Notice This is a Nordson Corporation publication which is protected by copyright. Nordson Corporation welcomes requests for information, comments, and Original copyright date 1997. No part of this document may be inquiries about its products. General information about Nordson can be...

  • Page 3: Table Of Contents

    ........Waterborne Systems with Nordson Iso-Flo Unit .
  • Page 4 ........RA-20 Rotary Atomizer Cable-Fed Version .
  • Page 5 ......Cable-Fed RA-20 Rotary Atomizer ......
  • Page 6 Table of Contents Part 237366-06 E 2019 Nordson Corporation...

  • Page 7: Safety

    Regulations and Approvals Make sure all equipment is rated and approved for the environment in which it is used. Any approvals obtained for Nordson equipment will be voided if instructions for installation, operation, and service are not followed. Part 237366-06...

  • Page 8: Personal Safety

    If you suffer a fluid injection injury, seek medical care immediately. If possible, provide a copy of the MSDS for the injected fluid to the health care provider. Part 237366-06 E 2019 Nordson Corporation...

  • Page 9: Fire Safety

    Do not smoke, weld, grind, or use open flames where flammable materials are being used or stored. Do not heat materials to temperatures above those recommended by the manufacturer. Make sure heat monitoring and limiting devices are working properly. Part 237366-06 E 2019 Nordson Corporation...

  • Page 10: Halogenated Hydrocarbon Solvent Hazards

    Clean, maintain, test, and repair equipment according to the instructions in your equipment documentation. Use only replacement parts that are designed for use with original equipment. Contact your Nordson representative for parts information and advice. Halogenated Hydrocarbon Solvent Hazards Do not use halogenated hydrocarbon solvents in a pressurized system that contains aluminum components.

  • Page 11: Description

    The cable-fed version uses a remote power supply and high-voltage cable. The IPS version includes an internal multiplier. The waterborne version has no provisions for charging the coating material. The coating material is charged before being pumped to the RA-20 rotary atomizer. Part 237366-06 E 2019 Nordson Corporation...

  • Page 12: Valve Options

    Description Valve Options The basic RA-20 rotary atomizer is equipped with a paint valve. Solvent and dump valve kits can be added at the factory or in the field. Possible configurations are: paint valve only paint and dump valve paint and solvent valve paint, solvent, and dump valve Refer to the Parts section for kit part numbers.

  • Page 13: Closed-Loop Speed Controls

    In this system, the electrostatic voltage is generated at the remote power supply and conveyed by the high-voltage cable to the Iso-Flo unit. The Iso-Flo unit charges the coating material and pumps it to the RA-20 rotary atomizer through an insulated hose.

  • Page 14: Description

    Description Description See Figure 2-1. A cable-fed version of the RA-20 rotary atomizer is shown. Turbine The turbine (14) is air-powered. Turbine air provides the rotating force. Brake air slows or stops the turbine quickly. The turbine shaft (11) floats on a cushion of bearing air as it rotates.

  • Page 15: Electrostatics

    (4), and the charge-ring resistors (6) limit current draw from the power supply. The IPS version of the RA-20 rotary atomizer uses a multiplier with a built-in resistor to generate the electrostatic voltage. In both the cable-fed and the IPS versions, the rotating cup picks up the voltage from electrodes on the charge ring.
  • Page 16 Description Part 237366-06 E 2019 Nordson Corporation...

  • Page 17: Installation

    (if used), and high-voltage or IPS cable have been connected. 2. Secure the mounting stem (1) to a fixed stand, oscillator, or reciprocator. Use a mounting device that allows vertical and horizontal adjustment of the RA-20 rotary atomizer’s position. Figure 3-1 RA-20 Rotary Atomizer Mounting 1. Mounting stem 2.

  • Page 18: Air Connections

    Failure to observe this warning may result in equipment damage, personal injury, or death. CAUTION: Operating the RA-20 rotary atomizer without adequately filtering the air supply, or without the specified bearing air pressure, will cause the turbine to fail prematurely, and will void all warranties. Do not install any shutoff valves in the bearing air tubing.

  • Page 19: Fluid Connections

    Refer to Using the Grooving Tool in this section. Waterborne Systems with Nordson Iso-Flo Unit See Figure 3-3. Make the following connections, depending on your RA-20 rotary atomizer configuration: Paint Valve: Route -in. fluid tubing (6) from the Iso-Flo unit through the FLUID hole in the rear mounting plate.

  • Page 20: Solventborne Systems

    Ungrounded tubing can deliver a severe shock, or cause a fire or explosion. Failure to observe this warning may result in equipment damage, personal injury, or death. See Figure 3-4. Make the following connections, depending on your RA-20 rotary atomizer configuration: Paint Valve Only 1.
  • Page 21 Installation Figure 3-4 Fluid Connections—Solventborne Systems 1. Dump valve -in. fluid tubing -in. fluid tubing 2. Solvent valve -in. fluid tubing 7. Grounding brackets 3. Paint valve Part 237366-06 E 2019 Nordson Corporation...

  • Page 22: Using The Grooving Tool

    4. Press down on the thumb rest and remove the tubing from the tool. Make sure the groove is cleanly cut and free of burrs. Figure 3-5 Using the Grooving Tool 1. Thumb rest 3. Tubing 2. Arrow 4. Collar Part 237366-06 E 2019 Nordson Corporation...

  • Page 23: Fiber Optic Cable Installation (Optional)

    Fiber-Optic Module Figure 3-6 Fiber Optic Cable Installation − Rotary Atomizer 1. Rear mounting plate 4. Set screw in. bulkhead union 2. Fiber optic cable 5. Interface plate in. air tubing 3. Cable ferrule Part 237366-06 E 2019 Nordson Corporation...

  • Page 24: Electrostatic Connections

    Electrostatic Connections These procedures cover IPS cable and high-voltage cable connections to the RA-20 rotary atomizer. Refer to the manuals for the IPS10 control unit, XPS-115 power supply, or the Iso-Flo unit for instructions on connecting the cables to them.

  • Page 25: High-Voltage Cable

    High-Voltage Cable WARNING: Only the Nordson XPS-115 power supply and IFC-100 high-voltage cable are approved for use with the RA-20 rotary atomizer. Using an unauthorized power supply or high-voltage cable with the RA-20 rotary atomizer is hazardous and will void any approvals and warranties.
  • Page 26 3-10 Installation Part 237366-06 E 2019 Nordson Corporation...

  • Page 27: Operation

    Refer to the Specifications section for air quality and pressure specifications. Flush new systems and new RA-20 rotary atomizers before starting production. Flushing removes oils and contaminants left in the system components and RA-20 rotary atomizer during manufacturing or installation.

  • Page 28: Startup

    (contd) 6. Supply coating material to the paint or dump valve. Use the coating material to flush the solvent or cleaning solution out of the RA-20 rotary atomizer as follows: Paint valve only: Trigger the paint valve until the coating material flushes out the solvent or cleaning solution.

  • Page 29: Modifying The Spray Pattern

    Refer to Removing and Installing the Cup Assembly in this section. 5. Soak the cup and distributor in a solvent or cleaning solution compatible with your coating material. 6. Shut off system compressed air and electrical power. Part 237366-06 E 2019 Nordson Corporation...

  • Page 30: Long-Term Shutdown

    To disassemble a standard cup, insert the -in. hex-key, supplied with the RA-20 rotary atomizer, through the back of the cup and into the standard distributor (3). Turn the hex-key counterclockwise (as viewed from the back of the cup) to unscrew the distributor from the cup.

  • Page 31: Removing And Installing The Nozzle And Fluid Tube

    2. Unscrew the nozzle (9) from the end of the fluid tube (4). 3. Make sure the new nozzle has an O-ring installed. Thread the new nozzle into the fluid tube and tighten it finger-tight. Do not overtighten. 4. Install the cup assembly. Part 237366-06 E 2019 Nordson Corporation...

  • Page 32: Fluid Tube

    3. Support the turbine (5) with one hand. Remove the two socket-head screws (6) from the interface plate (1) with the -in. hex-key ball driver supplied with the RA-20 rotary atomizer. 4. If the fluid coupling (3) remained in the fluid tube, remove it.
  • Page 33 Removing and Installing the Nozzle and Fluid Tube 1. Interface plate 5. Turbine 8. Rear shroud 2. O-rings 6. Socket-head screws 9. Nozzle 3. Fluid coupling 7. Oval-head screws 10. Cup assembly 4. Fluid tube Part 237366-06 E 2019 Nordson Corporation...

  • Page 34: Maintenance

    Check the resistance between the workpieces and ground. Resistance must not exceed one megohm. For best transfer efficiency, resistance should be less than 300 ohms. Strip workpiece hangers regularly. Refer to Table 4-1 for resistance checks. Part 237366-06 E 2019 Nordson Corporation...

  • Page 35: Ra-20 Rotary Atomizer Cable-Fed Version

    Operation RA-20 Rotary Atomizer Cable-Fed Version WARNING: Turn off electrostatic power supplies and wait at least 3 minutes before removing the high-voltage cable from the atomizer or power supply. After removing the cable, ground the contact on the end. Failure to observe this warning may result in a severe shock.

  • Page 36: Resistance Checks Diagram

    4-10 Operation Resistance Checks Diagram Figure 4-3 Resistance Checks Part 237366-06 E 2019 Nordson Corporation...

  • Page 37: Troubleshooting

    If you cannot solve a problem with the information given here, contact your local Nordson representative for help. Problem Page Poor coating material transfer efficiency Coating material wraps back on RA-20 rotary atomizer Poor coating material atomization Turbine will not rotate, rotates slowly, or oscillates No turbine speed control or display...
  • Page 38 Repair or replace components as necessary. 2. Coating material wraps Spray booth air velocity too low Check the air flow through the booth. back on RA-20 rotary Increase the exhaust fan speed or atomizer replace the filters. Insufficient vector air Increase the vector air pressure.
  • Page 39 Coating material viscosity incorrect Change the viscosity. For help, contact your Nordson representative and/or material supplier. Flow rate too high Lower the flow rate by decreasing the fluid pressure or changing the nozzle or fluid tube.
  • Page 40 Switch or solenoid valve defective Check the components and replace them if they are defective. 9. Material leaking from Valve seals worn Repair or replace the leaking valve. valve weep holes Part 237366-06 E 2019 Nordson Corporation...

  • Page 41: Repair

    Introduction This section provides instructions for disassembling and assembling the RA-20 rotary atomizer. The atomizer can be disassembled without removing it from its mounting. Repair instructions for the valves and the turbine are contained in separate manuals. NOTE: The numeric callouts in this section match the item numbers in the rotary atomizer’s main parts list.

  • Page 42: Valve Removal

    Do not lose the O-ring that provides a seal between the valves. Valve Rebuild To rebuild the valves, refer to the RA-20 Paint/Solvent/Dump Valve instruction sheet. Valve Installation Perform the removal steps in reverse to install new or rebuilt valves. Make...
  • Page 43 3. Rear mounting plate 21a. Brake air connector C. Socket-head screw 4. Set screw 21b. Bearing air connector D. Manifold 6. Paint valve 24. Oval-head screws E. Fiber-optic cable (optional) 7. Interface plate 29. Socket-head screw Part 237366-06 E 2019 Nordson Corporation...

  • Page 44: Turbine Replacement

    -in. hex-key ball driver supplied with the RA-20 rotary atomizer. 4. Pull the turbine straight away from the interface plate. If your RA-20 rotary atomizer is an IPS version, be careful not to damage the IPS multiplier extension. If your atomizer is a cable-fed version, the barrel resistor tube is left sticking out of the interface plate.
  • Page 45 Repair Cable Figure 6-3 Turbine Removal 7. Interface plate 19. Socket-head screws 31. O-rings 13. Turbine 30. Fluid coupling 32. O-ring 18. O-rings Part 237366-06 E 2019 Nordson Corporation...

  • Page 46: Turbine Disassembly

    7. Remove the following parts from the turbine in this order: flat-head screw (8) exhaust cover (9) four turbine exhaust plugs (17) fluid tube (34) 8. Remove the O-ring (33) and resistor sleeve (27) from the turbine. Part 237366-06 E 2019 Nordson Corporation...
  • Page 47 10. Shroud screw 34. Fluid tube Figure 7-3.) 11. O-rings 35. O-ring A. Transmitter assembly 12. Front shroud 37. Charge ring B. Flat-head screw 13. Turbine 39. O-ring 17. Exhaust plugs 40. Fillister head screw Part 237366-06 E 2019 Nordson Corporation...

  • Page 48: Turbine Assembly

    3. Secure the turbine to the interface plate with the two socket-head screws (19). 4. Connect the IPS cable (if removed) to the IPS multiplier. 5. See Figure 6-1. Install the rear shroud (2). Part 237366-06 E 2019 Nordson Corporation...
  • Page 49 NOTE: Keep PTFE tape and O-ring lubricant out of air and fluid paths. Note Item Description 11, 18, 31, Coat with O-ring grease before installing. 32, 33, 35, 20, 21 Use PTFE tape on all pipe thread connections. Part 237366-06 E 2019 Nordson Corporation...
  • Page 50 6-10 Repair Part 237366-06 E 2019 Nordson Corporation...

  • Page 51: Parts

    A dash (—) is used when the part number applies to all parts in the illustration. The number in the Part column is the Nordson Corporation part number. A series of dashes in this column (- - - - - -) means the part cannot be ordered separately.

  • Page 52: Cable-Fed Ra-20 Rotary Atomizer

    -in. tube x -in. NPTF NOTE A: Refer to the RA-20 Paint/Solvent/Dump Valve instruction sheet for a parts breakdown. B: Part is included in seal replacement kit, part 295381. Refer to Seal Kit. C: This part is listed multiple times within this assembly. Order the appropriate quantity.
  • Page 53 Parts Figure 7-1 Cable-Fed RA-20 Rotary Atomizer Part 237366-06 E 2019 Nordson Corporation...
  • Page 54 S O-RING, Buna-N, 1.063 x 1.188 x 0.063 in. 943520 S O-RING, Buna-N, 4.875 x 5.25 x 0.188 in. 181761 S TUBE, fluid, (0.161 in.), RA-20 941351 S O-RING, Buna-N, 1.94 x 2.12 in., 55 duro 295411 S PLUG, fiber optic cable, RA-20...
  • Page 55 Parts Figure 7-2 Cable-Fed RA-20 Rotary Atomizer Part 237366-06 E 2019 Nordson Corporation...

  • Page 56: Ips Ra-20 Rotary Atomizer

    -in. tube x -in. NPTF NOTE A: Refer to the RA-20 Paint/Solvent/Dump Valve instruction sheet for a parts breakdown. B: Part is included in seal replacement kit, part 295381. Refer to Seal Kit. C: This part is listed multiple times within this assembly. Order the appropriate quantity.
  • Page 57 Parts Figure 7-3 IPS RA-20 Rotary Atomizer Part 237366-06 E 2019 Nordson Corporation...
  • Page 58 S O-RING, Buna-N, 1.063 x 1.188 x 0.063 in. 943520 S O-RING, Buna-N, 4.875 x 5.25 x 0.188 in. 181761 S TUBE, fluid, (0.161 in.), RA-20 941351 S O-RING, Buna-N, 1.94 x 2.12 in., 55 duro 295411 S PLUG, fiber optic cable, RA-20...
  • Page 59 Parts Figure 7-4 IPS RA-20 Rotary Atomizer Part 237366-06 E 2019 Nordson Corporation...

  • Page 60: Waterborne Ra-20 Rotary Atomizer

    -in. tube x -in. NPTF NOTE A: Refer to the RA-20 Paint/Solvent/Dump Valve instruction sheet for a parts breakdown. B: Part is included in seal replacement kit, part 295381. Refer to Seal Kit. C: This item is listed multiple times within this parts list. Order the appropriate quantity.
  • Page 61 7-11 Parts Figure 7-5 Waterborne RA-20 Rotary Atomizer Part 237366-06 E 2019 Nordson Corporation...
  • Page 62 S O-RING, Buna-N, 1.063 x 1.188 x 0.063 in. 943520 S O-RING, Buna-N, 4.875 x 5.25 x 0.188 in. 181761 S TUBE, fluid, (0.161 in.), RA-20 941351 S O-RING, Buna-N, 1.94 x 2.12 in., 55 duro 295411 S PLUG, fiber optic cable, RA-20...
  • Page 63 7-13 Parts Figure 7-6 Waterborne RA-20 Rotary Atomizer Part 237366-06 E 2019 Nordson Corporation...

  • Page 64: Seal Kit

    B: Additional spare O-rings are included. C: The RA-20 rotary atomizer uses four O-rings. The RA-20R rotary atomizer uses eight O-rings. D: This part is used on the optional valve manifold. Refer to the RA-20 Paint//Solvent Dump Valve instruction sheet for more information.

  • Page 65: Recommended Spare Parts

    CUP, 2.5-in. diameter, with fins, pads, assembly 1616745 KIT, rotary, cover 169649 S BAG, rotary, cover NOTE A: Refer to Service Kit for a breakdown of parts. B: Refer to the RA-20 Paint/Solvent/Dump Valve instruction sheet for a parts breakdown. Part 237366-06 E 2019 Nordson Corporation...

  • Page 66: Options

    RETAINER/DISTRIBUTOR, premium finish 1050427 DISTRIBUTOR, premium finish, emulsion 1050428 NOZZLE, fluid, 0.060-in. diameter, premium finish, emulsion 940092 S O-RING, Viton, black, NOTE A: Premium finish cup requires retainer/distributor (339691), distributor (1050427), and nozzle (1050428). Part 237366-06 E 2019 Nordson Corporation...

  • Page 67: Nozzles

    Description Quantity 181761 TUBE, fluid, RA-20, 0.161-in. diameter orifice 168671 TUBE, fluid, RA-20, 0.100-in. diameter orifice Valve and Valve Kits NOTE: Refer to the RA-20 Paint/Solvent/Dump Valve instruction sheet for a parts breakdown. Part Description Quantity Note 302135 VALVE, RA-20 dump, RA-20R, trigger...

  • Page 68: Accessories

    NOTE A: Use with RPM indicator. Contact your Nordson Corporation representative for part numbers and ordering instructions. B: Kit can be used with the RA-20 and the RA-20R rotary atomizer. Refer to the Pattern Control Kit instruction sheet for installation and part information.

  • Page 69: Specifications

    7 bar (100 psi), 0.080 orifice: 750 cc/min NOTE: 130 centipoise is approximately 53 seconds on Zahn 2 15 seconds on Zahn 3 43 seconds on Ford 4 64 seconds on Fisher 2 Part 237366-06 E 2019 Nordson Corporation...

  • Page 70: Turbine Speed

    504 l/min at 2.7 bar (17.8 scfm at 30 psig) NOTE: Paint used was 20 seconds on Zahn #2 cup and all air tubing was 30 ft long. The pressure was measured at the beginning of the 30 ft tubing. Part 237366-06 E 2019 Nordson Corporation...

  • Page 71: Air Quality

    XPS 115 controller as associated apparatus used with Category 2 equipment, if it functions as Category 3 equipment, then this application is covered by the manufacturer’s declaration and the marking is applied at the manufacturer’s discretion. Part 237366-06 E 2019 Nordson Corporation...
  • Page 72 Specifications 1611970−01 Figure 8-7 RA-20 Rotary Atomizer Certification Label for 115KV Version Part 237366-06 E 2019 Nordson Corporation...
  • Page 73 RA-20 Rotary Atomizer Service Kits and Parts Refer to RA-20 Manual 237366 for complete service and parts information. 295381 Seal Kit For parts and technical support call (800) 433-9319. 230928 Plug 220639 Turbine Cups and Distributors (Options) 189868 Cover Flip over for Options...
  • Page 74 295387 Nozzle, fluid, .070 in. O-ring 295388 Nozzle, fluid, .080 in.* * These nozzles are included in 1060768 Kit, Ship With, RA-20 Fluid Tubes 181761 Tube, fluid, .161 in. diameter orifice (standard) 168671 Tube, fluid, .100 in. Diameter orifice (optional)
  • Page 75 P/N 1023432A Pattern Control Kit Description The pattern control kit is an option that can be installed on the RA-20 rotary atomizer or the RA-20R rotary atomizer. With this kit the rotary atomizer produces smaller, more uniform spray pattern without compromising transfer efficiency.
  • Page 76 7. Remove the four screws (M) on the top of the turbine cap to remove the cap from the turbine. 8. Remove the screws (J) on the inside of the front shroud to separate the front shroud from the charge ring. E 2002 Nordson Corporation Part 1023432A...
  • Page 77 3b. Pattern control distributor J. Screws C. Hex-key ball driver 4a. Nozzle K. Screws D. Rear shroud 4b. O-ring L. O-rings E. Turbine 6. Pattern control charge ring M. Screws F. Turbine cap 7. Pattern control cup E 2002 Nordson Corporation Part 1023432A...
  • Page 78 7. Rotate the pattern control cup and push on the driver until it drops into the hole in the turbine shaft. 8. Hold the driver and turn the cup clockwise (as viewed from the front) to screw it into the turbine shaft. E 2002 Nordson Corporation Part 1023432A...
  • Page 79 - - - - - - S Nozzle, RA-20, 0.060-in. diameter with 1022203 O-ring S S Nozzle, fluid, RA-20, 0.060-in. diameter - - - - - - S S O-ring, Viton, black, 940092 S O-ring, Buna-N, 1.437 x 1.687 x 0.125 in.
  • Page 80 Pattern Control Kit Issued 2/02 Viton is a registered trademark of DuPont Dow Elastomers. L.L.C. Original copyright date 2002. Nordson and the Nordson logo are registered trademarks of Nordson Corporation. E 2002 Nordson Corporation Part 1023432A...
  • Page 83 The RA-20 & the ESB-100 are both used with the XPS-115 controller. The XPS-115 controller has a high voltage cable which supplies 115KV Max to the RA-20 or the ESB-100. The RA-20 liquid electrostatic rotary atomizer is used for applying liquid coatings to a sub straight. The ESB-100 is used to shape the liquid coating pattern from the RA- 20 and in most cases decrease the height of the spray pattern to help eliminate coating of the spray booth ceiling.

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