Model 685.
Copyright information Trademark information Contact information © 1992 - 2004 MTS Systems Corporation. All rights reserved. MTS is a registered trademark of MTS Systems Corporation. MTS Systems Corporation 14000 Technology Drive Eden Prairie, Minnesota 55344-2290 USA Toll Free Phone: 800-328-2255 (within the U.S. or Canada) Phone: 952-937-4000 (outside the U.S. or Canada) Fax: 952-937-4515 E-mail: info@mts.com http://www.mts.
Contents Introduction 5 Functional Description Specifications 6 7 Installation 9 Crush Point Hazards Installation Procedure 10 11 Operation 15 Controls 16 Determining the Grip Operating Pressure Adjusting the Output Pressure Adjusting the Rate Control Gripping Specimens 18 19 20 21 Removing Specimens from the Grips Model 685.
Contents Model 685.
Introduction The Model 685.53 Hydraulic Grip Control Module provides an easy way to grip specimens for testing. It mounts on the front of a load unit or grip supply to provide control of the hydraulic grips. The Model 685.53 Hydraulic Grip Control Module is a control only; it depends on an external source for hydraulic pressure.
Functional Description Functional Description The 685.53 Hydraulic Grip Control Module is designed to provide the hydraulic grip control for specimen grips and includes the following features. Hydraulic schematic • Hydraulic flow control determines how fast the grips operate. • The hydraulic pressure can be adjusted between 0.7 and 20.7 MPa (100 and 3000 psi). • Provides independent grip/release control for each of two grips. The following figure shows the hydraulic schematic for the grip control.
Specifications Specifications The following table lists the hydraulic specifications for the grip control. Parameter Specification Maximum Input Pressure 21 MPa (3000 psi) Pressure Control Range 0.7–21 MPa (± 0.06 MPa) (100–3000 psi (± 10 psi)) Pressure Stability (at all pressures) ± 0.03 MPa (± 5 psi) Grip and Pressure Fittings male, JIC 37º flare -6 Drain Fitting male, JIC 37º flare -4 Model 685.
Specifications 8 Introduction Model 685.
Installation Installing a Model 685.53 Hydraulic Grip Control module consists of installing the control panel and manifold in the load unit and making the hydraulic hose connections to the upper and lower grips. Contents Crush Point Hazards Installation Procedure 10 11 Hydraulic Grip Control Pressure 4 5 6 7 8 3 Rate 2 9 1 10 685.
Crush Point Hazards Crush Point Hazards It is important to stay clear of any potential crush points during installation or when the system is operating. Know where the crush points are in your system and protect yourself and others from those crush points with appropriate safety devices. The following paragraphs describe crush points and precautions to take while working around crush points, and apply to most systems.
Installation Procedure Installation Procedure Installing a Model 685.53 Hydraulic Grip Control module consists of installing the control panel and manifold in the load unit and making the hydraulic hose connections to the upper and lower grips. The following procedure assumes that the grips to be controlled by the hydraulic grip supply have been properly installed on a load unit. WARNING Never leave a crosshead unlocked.
Installation Procedure B. Restrain the control panel and remove the four screws securing the panel to the base. C. Grasp the control panel and slowly lower it to the mechanical stop of the securing cables. 5. Install the grip control module in the control panel. Refer to the drawings that accompany the module and the illustrations on page 9. WARNING Do not use hydraulic hoses rated for less than 21 MPa (3000 psi). Under-rated hoses may rupture and can cause injury to personnel or damage to equipment.
Installation Procedure CAUTION Do not clamp the grips without a specimen installed. Some grips may be damaged by closing the grip without a specimen inserted or with a specimen only partially inserted. See the appropriate grip product information manual for detailed specimen mounting instructions. 10. Check the grip operation. Change the grip controls between grip and release a few times and check for leaks at all connections (correct as needed). 11. Secure the control panel.
Installation Procedure 14 Installation Model 685.
Operation This section describes how to use the hydraulic grip supply. Some operating details depend on the particular grips you have. You should have your grip product information manual available for specimen installation and removal procedures. Contents Controls 16 Determining the Grip Operating Pressure Adjusting the Output Pressure Gripping Specimens 19 21 Removing Specimens from the Grips Model 685.
Controls Controls The controls and indicators are located on the control panel shown below. Hydraulic Grip Control Pressure 4 5 6 7 8 3 2 Rate Control Lower Grip Control 9 1 10 Description Controls the lower grip for specimen installation and removal. The threeposition control can grip or release one end of a specimen. This indicates the lower clamp is gripping the specimen. Turn the control clockwise to clamp a specimen into the lower grip.
Controls Control Description Adjusts the amount of hydraulic pressure applied to the grips for gripping the specimen. Pressure This is a multiturn knob. Pressure increases as the knob is turned clockwise and decreases as the knob is turned counterclockwise. Pressure To determine the correct operating pressure, see “Adjusting the Output Pressure” on page 19. Adjusts how fast the grips clamp and unclamp. This control requires the use of a hex-key wrench for adjustment.
Determining the Grip Operating Pressure Determining the Grip Operating Pressure You must consider the following factors to determine the appropriate grip operating pressure: • The type of grips to be used • The specimens to be tested • The tests to be performed • The model number of the grip supply Grip product information manuals (from MTS) describe how to determine the required operating pressure.
Adjusting the Output Pressure Adjusting the Output Pressure The output pressure of the hydraulic grip control determines the gripping force applied to the specimen by the grips. The output pressure can be adjusted up to the maximum output pressure of the system hydraulic power unit which is usually 21 MPa (3000 psi). 1. Determine the required grip operating pressure. See “Determining the Grip Operating Pressure” on page 18 and also see the grip product information manual. 2.
Adjusting the Rate Control Adjusting the Rate Control The Rate control may be adjusted at any time. If the grips act too fast to suit your personal preference, turn the Rate control clockwise to slow the speed of grip action. Turning the Rate control counterclockwise speeds up grip action. Turning the Rate control fully clockwise stops the flow of fluid to the grips. If the grips do not operate, check to be sure that the Rate control has not been turned fully clockwise.
Gripping Specimens Gripping Specimens Prerequisite This procedure assumes that the output pressure has been adjusted. Have the appropriate grip product information manual handy for more specific specimen mounting information. WARNING Do not put anything in a crush zone when turning on hydraulic power. Unexpected actuator movement can occur when hydraulic pressure is turned on. This can cause personal injury or equipment damage.
Gripping Specimens CAUTION Do not clamp the grips without a specimen installed. Some grips may be damaged by closing the grip without a specimen inserted or with a specimen only partially inserted. See the appropriate grip product information manual for detailed specimen mounting instructions. 4. Grip the specimen as follows: Because of the large variety of load frame, grip, and controller equipment in use, it is impossible to give explicit instructions for this process.
Removing Specimens from the Grips Removing Specimens from the Grips Perform the following steps to remove a specimen from the grips. WARNING Do not put anything in a crush zone when turning on hydraulic power. Heavy specimens or specimen fragments falling from the grips can injure you or damage test equipment. Take adequate precautions to support heavy specimens while releasing them from the grips. 1.
m MTS Systems Corporation 14000 Technology Drive Eden Prairie, Minnesota 55344-2290 USA Toll Free Phone: 800-328-2255 (within the U.S. or Canada) Phone: 952-937-4000 (outside the U.S. or Canada) Fax: 952-937-4515 E-mail: info@mts.com http://www.mts.
