m be certain. Series 242 Actuators Product Information Model Model Model Model 011-562-001 J 242.00 242.01 242.02 242.
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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 242 Actuator Component Identification 242 Actuator Functional Description 242 Actuator Mounting 17 17 242 Actuator/Servovalve Interface 242 Actuator Operation 15 17 17 242 Actuator LVDT Operation 18 242 Actuator Force Specifications 242 Act
Operation 31 242 Actuator Operating Considerations Sideload Calculation Procedure 32 33 Maintenance 37 242 Actuator Maintenance Schedule 4 37 Series 242 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 242 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 242 Actuator Product Information
Introduction The Series 242 Actuator is a linear actuator. A linear actuator is a hydraulically powered device that provides displacement of (or force into) a specimen or structure for testing.
Actuator ID • Low force structural fatigue • High velocity, short stroke component tests • Low friction, low signal distortion vibration testing • Structural resonance searching and modal analysis 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 242 Actuator Component Identification Series 242 Actuator Component Identification Piston Rod Piston Rod End Piston Rod Seal Cushion Piston Rod Bearings Viscous Seal Retraction Port Cushion Extension Port Drainback Port Piston Rod Seal LVDT Assembly Spacer Tube LVDT Connector Pedestal Base Series 242 Linear Actuator Series 242 Actuator Product Information Introduction 15
Series 242 Actuator Component Identification Series 242 Actuator Component Descriptions COMPONENT DESCRIPTION Piston rod The actuator is equipped with a double-ended piston rod. The double-ended piston has equal areas on both sides for balanced performance. It is machined from a single piece of heat-treated alloy steel, hard-chrome plated, and precision ground to a fine finish for reliable operation. The piston rod is hollow to allow for installation and accurate alignment of a displacement transducer.
242 Actuator Functional Description 242 Actuator Functional Description A linear actuator is used to push on a specimen to cause it to crush or compress (compression testing), or to pull it apart causing it to stretch (tensile testing). A linear actuator consists of a cylinder that contains a piston and a manifold to mount a servovalve.
242 Actuator LVDT Operation 242 Actuator LVDT Operation The internally mounted LVDT provides an indication of the actuator piston rod displacement. Locking Screw Retainer Core LVDT Core Extension Hollow Piston Rod LVDT Coil Locking Collar 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. The core extension is mounted inside the hollow piston rod and moves as the piston rod moves.
242 Actuator Force Specifications 242 Actuator Force Specifications Actuator Force Specifications MODEL* FORCE RATING† PISTON AREA ROD DIAMETER KN KIP MM2 IN2 MM IN 242.00 2.7 0.6 136 0.21 28.6 1.12 242.01 4.5 1.0 271 0.42 28.6 1.12 242.02 10.0 2.2 594 0.92 28.6 1.12 242.03 15.0 3.3 760 1.18 28.6 1.12 * Each model has a standard stroke length of 101.6 and 152.4 mm (4 and 6 in). This value is total stroke minus the total cushion length, 12.7 mm (0.50 in).
242 Actuator Dimensions (3.5 in) sq. 4 holes, 5/16 -18 UNC x 0.5 in (12.7 mm) deep, equally spaced on a 2.5 in. (63.5 mm) diameter 6.35 mm (0.25 in) Cushion 1/2 - 20 UNF-2B x 3.62 in (91.95 mm) deep 6.35 mm (0.25 in) Cushion Dynamic Stroke 19.05 mm (0.75 in) min. 31.75 mm (1.25 in) B 31.75 mm (1.25 in) 2.54 mm (0.10 in) minimum C A maximum 31.75 mm (1.25 in) 46.00 mm (1.81 in) 4 holes, 7.11 mm (0.28 in) diameter through 76.2 mm (3.0 in) sq. 1/2 - 20 UNF-2B x 1.0 in (25.4 mm) 88.9 mm (3.
Hazard Placard Placement Safety Information 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 • Effective Area • Static Stroke • Dynamic Stroke • Hydrostatic/Non-Hydrostatic Pressure icon. Can be used alone, or in conjunction with pressure rating label (Part # 057-237-711). Part # 57-237-711 Part # 57-238-5xx Series 242 Actuator Product Information Pressure rating.
Hazard Placard Placement 24 Safety Information Series 242 Actuator Product Information
Load Unit Configuration Installation Installing the Series 242 Actuator depends on the testing application. Contents • For materials or component testing, the actuator is typically installed in a load frame configuration or test fixture. For more information, see the following load unit configuration topic. • For structural or vibration testing, the actuator is typically secured to a reaction mass using a swivel or pedestal base.
Installing a Fixture to the Actuator See the system assembly drawing, system functional drawing, and console assembly drawing (typically located in a System Reference manual supplied with your system documentation) for information about hydraulic and electrical connections. Note Servovalves Actuators mounted in a load unit should not be removed from the load unit. Alignment should not be performed in the field. A Series 252 Servovalve is typically mounted directly to the actuator.
Installing a Fixture to the Actuator Pedestal Base 1/2-20 UNF-2B x 1.0 in (25.4 mm) deep 4 holes, 0.28 in (7.11 mm) diameter through Pedestal Base Mounting Holes The previous figure shows the thread specifications. To install a swivel mounting accessory, thread the swivel into the mounting hole and tighten the hex nut to 108 N·m (80 lbf·ft).
Mounting Swivels Mounting Swivels Swivels can be mounted to the piston rod and the pedestal base. A Series 249 Swivel can be used with the Series 242 Actuator. See the Series 249 Swivel Product Information manual for additional information. Piston Rod Swivel Force Transducer Actuator Assembly Pedestal Base Swivel The swivel is mounted with four M10 x 1.50 (3/8-16) socket head bolts.
Connecting the LVDT Cable . 1 3 4 2 Connecting the LVDT Cable The following figure shows the electrical connections of the LVDT. See your controller manual for cable specifications or cable assembly numbers.
Connecting Hydraulics-242 Actuator Connecting Hydraulics-242 Actuator Hydraulic connections to the Series 242 Actuator are made through a manifold that connects the ports of each end cap. The manifold has hydraulic pressure, return, and drain ports stamped P, R, and D, respectively. These ports are connected to matching ports located on a hydraulic service manifold (HSM). Note When the Series 242 Actuator is installed in a load unit, the hydraulic connections are made through a manifold.
Operation This section describes the operation of the Series 242 Actuator and the internally mounted LVDT.
242 Actuator Operating Considerations 242 Actuator Operating Considerations Piston rod banding Piston rod banding can occur if the actuator is operated for a long period of time at a moderate to high frequency, with short stroke displacement and loads of 25% or more of the actuator capacity. Piston rod banding is the aggravated erosion of the piston rod chrome plating in a band slightly wider than the width of the seal encircling the circumference of the piston rod.
Sideload Calculation Procedure • Minimum allowable sideload frequency Sideload Calculation Procedure The following procedure provides you with information to determine the suitability of a particular actuator model for tests requiring nonaxial loading. Some of the constants used in this procedure are defined in the steps and others are listed in the following table. Sideload Constants Note STROKE (S) BEARING SPACING (A) 25.4 mm (1 in) 96.8 mm (3.82 in) 50.8 mm (2 in) 96.8 mm (3.82 in) 76.
Sideload Calculation Procedure P(S + A + D + C) + (F × B) L = ---------------------------------------------------------------------(S + A) where: S = Actuator stroke (see table) A = Actuator bearing spacing (see table) D = Bearing length = 35.8 mm (1.41 in) E = Bearing area = 42.2 mm (1.66 in) G = Rod diameter = 28.6 mm (1.12 in) K = Cyclic sideload = 3.6 3. Divide the actuator bearing load (L) by the actuator area constant (E) to determine the bearing pressure (V).
Sideload Calculation Procedure Use the following equation: Minimum Sideload Frequency = K × L × 0.
Sideload Calculation Procedure 36 Operation Series 242 Actuator Product Information
242 Actuator Maintenance Schedule Maintenance The Series 242 Actuator is designed for extended periods of operation without extensive maintenance requirements. 242 Actuator Maintenance Schedule The following table lists the recommended interval for each of these procedures. Maintenance Intervals* WHAT TO DO WHEN TO DO IT HOW TO DO IT Make daily inspections Before the start of each day’s testing Check for hydraulic fluid leaking from the actuator.
242 Actuator Maintenance Schedule 38 Maintenance Series 242 Actuator Product Information
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