m be certain. Series 248 Actuators Product Information Model 248.01 Model 248.02 Model 248.03 Model 248.04 Model 248.05 Model 248.11 Model 248.12 Model 248.
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Contents Technical Support 5 How to Get Technical Support Before You Contact MTS 5 5 If You Contact MTS by Phone 6 Problem Submittal Form in MTS Manuals 7 Preface 9 Before You Begin Conventions 9 10 Documentation Conventions 10 Introduction 13 Series 248 Actuator Component Identification Series 248 Actuator Functional Description About Actuator Operation About LVDT Operation 18 Static Support Assembly Actuator ID 16 17 Hydrostatic Bearing Capillaries Specifications and Dimensions 15 19 1
Installation 31 How to Install a Fixture to the Actuator How to Connect Cables to Actuator 32 33 How to Connect Hydraulics to the Actuator 34 Operation 35 About the Static Support Assembly How to Precharge the Static Support 36 37 How to Relieve Nitrogen Pressure from the Static Support Calculate Static Support Precharge How to Precharge the Static Support 38 38 39 Maintenance 43 4 Contents Series 248 Actuator Product Information
How to Get Technical Support Technical Support How to Get Technical Support Start with your manuals The manuals supplied by MTS provide most of the information you need to use and maintain your equipment. If your equipment includes MTS software, look for online help and README files that contain additional product information. If you cannot find answers to your technical questions from these sources, you can use the internet, e-mail, telephone, or fax to contact MTS for assistance.
If You Contact MTS by Phone Know information from prior technical assistance Identify the problem Know relevant computer information Know relevant software information If you have contacted MTS about this problem before, we can recall your file.
Problem Submittal Form in MTS Manuals If you are calling about an issue that has already been assigned a notification number, please provide that number. You will be assigned a unique notification number about any new issue.
Problem Submittal Form in MTS Manuals 8 Technical Support Series 248 Actuator Product Information
Before You Begin Preface Before You Begin Safety first! Before you attempt to use your MTS product or system, read and understand the Safety manual and any other safety information provided with your system. Improper installation, operation, or maintenance of MTS equipment in your test facility can result in hazardous conditions that can cause severe personal injury or death and damage to your equipment and specimen.
Conventions Conventions Documentation Conventions The following paragraphs describe some of the conventions that are used in your MTS manuals. Hazard conventions As necessary, hazard notices may be embedded in this manual. These notices contain safety information that is specific to the task to be performed. Hazard notices immediately precede the step or procedure that may lead to an associated hazard. Read all hazard notices carefully and follow the directions that are given.
Documentation Conventions Hypertext links The electronic document has many hypertext links displayed in a blue font. All blue words in the body text, along with all contents entries and index page numbers, are hypertext links. When you click a hypertext link, the application jumps to the corresponding topic.
Documentation Conventions 12 Preface Series 248 Actuator Product Information
Introduction This manual describes the MTS Series 248 Actuators and their components. Contents Series 248 Actuator Component Identification Series 248 Actuator Functional Description Specifications and Dimensions 15 16 20 m m m m An integral part of the actuator is a linear variable differential transformer (LVDT), which measures the displacement of the actuator (extension or retraction) and sends the information to the system controller. The LVDT is mounted inside the actuator.
• What you need to know 14 Introduction Material test systems usually have the actuator mounted in a load unit assembly. The actuator can be mounted below the base plate or above the crosshead. The end of the actuator uses fixtures (such as grips) to attach the test specimen to it. MTS Systems Corporation assumes that you know how to use your controller. See the appropriate manual for information about performing any controllerrelated step in this manual’s procedure.
Series 248 Actuator Component Identification Series 248 Actuator Component Identification Piston Rod Seal Piston Rod End Hydrostatic Bearing Retraction Port Piston Extension Port Piston Rod Seal Drainback Port LVDT Assembly Pedestal Base Series 248 Component Identification COMPONENT DESCRIPTION Piston rod end The piston rod end has a center position internal thread and a circular pattern of threaded holes for mounting vibration tables, load cells, swivels, and interface fixtures.
Series 248 Actuator Functional Description Series 248 Component Identification (Continued) COMPONENT DESCRIPTION Extension port/ Retraction port Ports allow fluid flow up to 945 L/m (250 gpm) for high velocity or high frequency operation. Internal passages are designed to minimize fluid flow restrictions. High-pressure hydraulic fluid is ported into the cylinder through the retraction port or the extension port. The flow is regulated by a servovalve.
About Actuator Operation LVDT Core Mount Retraction Port LVDT Core Extension Extension Port LVDT Coil Functional Description About Actuator Operation Actuator piston rod movement is accomplished by supplying high- pressure hydraulic fluid to one side of the actuator piston and opening the other side to a return line. High-pressure hydraulic fluid is ported into the cylinder through the retraction port or the extension port. The differential pressure across the piston forces the piston rod to move.
About LVDT Operation About LVDT Operation The internally mounted LVDT provides an indication of the actuator piston rod displacement. Adjusting Wrench (raises or lowers core mount) Hex Wrench Core Mount Locking Screw Core Mount O-Rings LVDT Core Extension Hollow Piston Rod LVDT Coil Pedestal Base LVDT Connector The LVDT is an electromechanical device that provides an output voltage which is proportional to the displacement of a moveable core extension.
Hydrostatic Bearing Capillaries Hydrostatic Bearing Capillaries Capillaries providing hydraulic fluid to the hydrostatic bearing pads are found in both the upper and lower end caps. The pressurized hydraulic fluid to the capillaries is supplied by a separate (pilot pressure) line. Hydraulic flow through the capillaries to the hydrostatic bearing pads can be checked without major disassembly.
Specifications and Dimensions Specifications and Dimensions Several types of specifications are listed on the following pages. Actuator ID A plate on the actuator (typically located on the front end cap opposite the drain line) contains the following information: • Model number • Serial number • Force rating • Area • Stroke specifications This information is required when contacting MTS Systems Corporation regarding the actuator.
Series 248 Actuator Dimensions Series 248 Actuator Dimensions E (dia.) D (cushion) Dynamic Stroke D (cushion) C (minimum) A B (min.) 4.8 mm (0.19 in) 8 holes, “G” thread size, “H” deep, equally spaced on a “J” diameter 4 holes, “G” thread size, “H” deep, equally spaced on a “J” diameter “K” thread size, “L” deep F (dia.) 248.0X 248.1X, 248.2X “K” thread size, “L” deep End Caps (both ends) M (dia.) 248.1X, 248.2X 248.
Series 248 Actuator Dimensions Actuator Dimentions A STROKE 248.0X 248.1X B 248.2X C D MM IN MM IN MM IN MM IN MM IN MM IN MM IN 25.4 1 302.0 11.89 312.1 12.29 345.7 13.61 9.6 0.38 31.8 1.25 9.6 0.38 50.8 2 327.4 12.89 337.5 13.29 371.1 14.61 9.6 0.38 31.8 1.25 9.6 0.38 101.6 4 396.2 15.64 407.4 16.04 441.0 17.36 9.6 0.38 31.8 1.25 19.1 0.75 152.4 6 448.0 17.64 458.2 18.04 491.8 19.36 9.6 0.38 31.8 1.25 19.1 0.75 203.2 8 498.
Open LVDT Housing Specifications Open LVDT Housing Specifications B 25.4 mm (1.00 in) A 31.8 mm (1.25 in) Open Housing LVDT Dimensional Drawing B (STROKE) MODEL A 25.4 MM (1 IN) 50.8 MM (2 IN) 101.6 MM (4 IN) 152.4 MM (6 IN) 203.2 MM (8 IN) 254.0 MM (10 IN) MM IN MM IN MM IN MM IN MM IN 248.0x 165.1 6.50 107.6 4.25 177.8 7.00 228.6 9.00 330.2 13.00 248.1x 196.9 7.75 107.6 4.25 177.8 7.00 228.6 9.00 330.2 13.00 248.2x 228.6 9.00 107.6 4.25 177.8 7.00 228.
Pedestal Base Specifications Pedestal Base Specifications 248.1x and 248.2x with 25.4 mm (1 in) or 50.8 mm (2 in) stroke B B 55.4 mm (2.18 in) A A 4 threaded holes, “E” size, “F” deep, equally spaced on a “G” diameter 8 holes, “C” diameter through, equally spaced on a “D” diameter Pedestal Base Dimensional Drawing . MODEL 248.0X 248.1X 248.2X * † ‡ § 24 A B C D MM IN MM IN MM IN MM IN 266.7 10.5 146.1* 5.75* 13.5 0.53 228.6 9.00 266.7 10.5 266.7† 10.50† 13.5 0.53 228.
Pedestal Base Specifications MODEL * † ‡ § A B C D MM IN MM IN MM IN MM IN 419.1 16.5 368.3‡ 14.50‡ 23.1 0.91 370.0 14.57 419.1 16.5 419.1§ 16.50§ 23.1 0.91 370.0 14.57 Applies to actuators with 25.4 or 50.8 mm (1 or 2 in.) stroke. Applies to actuators with 101.6 or 152.4 mm (4 or 6 in.) stroke. Applies to actuators with 203.2 or 254.0 mm (8 or 10 in.) stroke. Applies to actuators with 304.8 mm (12 in.) stroke. MODEL 248.0x 248.1x 248.
Static Support Dimensions Static Support Dimensions A B 4 holes 26.2 mm (1.03 in) diameter through F C E (31.8 mm (1.25 in.)) D 31.8 mm (1.25 in) Static Support Dimensional Drawing MODEL* A B C MM IN MM IN MM 248.0X 463.6 16.40 108.0 4.38 241.3 248.1X 692.2 27.25 134.9 5.31 248.2X 997.0 39.25 134.9 5.31 * 26 D IN E F MM IN MM IN MM IN 9.50 508.0 20.0 117.8 7.00 444.5 17.50 254.0 10.00 584.2 23.0 195.5 7.50 520.7 20.50 304.8 12.0 640.1 25.5 241.
Hazard Placard Placement Safety Hazard Placard Placement Hazard placards contain specific safety information and are affixed directly to the system so they are plainly visible. Each placard describes a system-related hazard. When possible, international symbols (icons) are used to graphically indicate the type of hazard and the placard label indicates its severity.
Hazard Placard Placement LABEL DESCRIPTION CAUTION High drain pressure can cause rod seal damage and hydraulic oil leakage. Remove drain line shipping cap and connect drain hose before operating. Part # 045-283-501 Attached mass warning. Do not exceed maximum attached mass.
Hazard Placard Placement LABEL DESCRIPTION Hydraulic Actuator ID tag lists the following: Part # 037-588-801 • Model number • Serial number • Assembly number/Rev • Force rating • Effective Area • Static Stroke • Dynamic Stroke • Hydrostatic/Non-Hydrostatic Pressure icon. Can be used alone, or in conjunction with pressure rating label (Part # 57-238-5xx). Part # 57-237-711 Part # 57-238-5xx Series 248 Actuator Product Information Pressure rating.
Hazard Placard Placement 30 Safety Series 248 Actuator Product Information
Installation Installing the Series 248 Actuators depend on the testing application. Contents • For structural or vibration testing, the actuator is typically configured with a pedestal base or a static support, and is bolted to a reaction mass. • Fixtures, such as a vibration table or a wheel pan, can be attached to the piston rod end using the internal thread circular hole pattern or with a connector stud using the center position internal thread.
How to Install a Fixture to the Actuator How to Install a Fixture to the Actuator Fixtures can be mounted to the pedestal base, the actuator piston rod, or the upper end cap. The actuator is equipped with an upper end cap and a pedestal base which has from four to eight threaded mounting holes. The pedestal base also contains a center position threaded hole which may be used to attach a swivel mounting accessory. The piston rod also contains a center position threaded hole.
How to Connect Cables to Actuator How to Connect Cables to Actuator The following figures show the electrical connections of the linear variable differential transformer (LVDT). See your controller manual for cable specifications or cable assembly numbers.
How to Connect Hydraulics to the Actuator How to Connect Hydraulics to the Actuator Connect the pressure, return, and drain lines to the ports stamped P, R and D, respectively. An optional pilot pressure port is marked PP. See the servovalve manual for servovalve installation information. Manifold The hydraulic ports are located on the manifold. Each port is marked.
Operation This section describes how to operate the Series 248 Actuators using the static support assembly. Contents About the Static Support Assembly How to Precharge the Static Support 36 37 How to Relieve Nitrogen Pressure from the Static Support Calculate Static Support Precharge How to Precharge the Static Support 38 38 39 WARNING Exceeding the maximum attached mass can cause unpredictable actuator movement. Unexpected actuator movement can result in injury to personnel or damage to equipment.
About the Static Support Assembly About the Static Support Assembly Instead of using hydraulic pressure to offset the weight of the specimen, a static support assembly can support a heavy structure or component on the actuator piston rod. Note Excessive pressure protection The static support assembly is offered for all models. If you require static support, contact MTS Systems Corporation for static support information.
How to Precharge the Static Support How to Precharge the Static Support The static support must be precharged with N2 gas. The gas is ported to the pedestal tube, where it pushes upward on the piston rod and supports the structure or component with minimal pressure differential (ΔP) across the piston. Pressurized N2 is also ported to the bottom and the end cap cover plate. Before you adjust the precharge pressure or service an actuator with a static support assembly, read the following warnings.
How to Relieve Nitrogen Pressure from the Static How to Relieve Nitrogen Pressure from the Static Support Nitrogen (N2) pressure must be relieved from the static support assembly before you service the actuator or the static support assembly. 1. Ensure that system hydraulic pressure has been reduced to zero before proceeding. To do this, turn off the hydraulic power unit and exercise the actuator until it stops moving. 2. Remove the protective cap from the gas valve on the static support.
How to Precharge the Static Support How to Precharge the Static Support For an actuator with static support, the N2 precharge should be checked prior to system operation. If necessary, the N2 should be precharged to the correct amount.
How to Precharge the Static Support Locknut Valve Stem Open Close Poppet Type Valve To Open and Close Use Locknut Low Pressure Gage 0-2.1 MPa (0-300 psi) High Pressure Gage 0-21 MP (0-3000 psi ) Gage Protector (factory set to limit pressure to the gage to approximately 1.
How to Precharge the Static Support 5. To increase pressure in the static support pressure vessel: A. Close the locknut. B. Open the bleed valve on the accumulator charger two turns. C. Connect the nitrogen supply hose from the pressure regulator output to the input of the accumulator charger. D. Open the nitrogen bottle output valve. E. Check the nitrogen bottle pressure gage to ensure that it contains sufficient pressure to provide adequate gas volume. F.
How to Precharge the Static Support 42 Operation Series 248 Actuator Product Information
Maintenance The Series 248 Actuators are designed for extended periods of operation without extensive maintenance requirements. WARNING Changing the servovalve/actuator configuration will impact the actuator’s maximum attached mass for cushion design limit. Operating an actuator outside of its design limit can result in injury to personenel or damage to the equipment. Do not alter the given servovalve/actuator configuration.
Maintenance Series 248 Actuator Product Information
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