MTS 685.53 User Manual

Model 685.53 Grip Control Module
Product Information

l

015-029-701 C

Copyright information © 1992 - 2004 MTS Systems Corporation. All rights reserved.

Trademark information MTS is a registered trademark of MTS Systems Corporation.

Contact information MTS Systems Corporation

14000 Technology Drive
Eden Prairie, Minnesota 55344-2290 USA
Toll Free Phone: [phone] (within the U.S. or Canada)
Phone: [phone] (outside the U.S. or Canada)
Fax: [phone]
E-mail: [e-mail]
http://www.mts.com

Publication information

Manual Part Number Publication Date

150297-01A November 1992

150297-01B January 1999

015-029-701 C August 2000

015-029-701 C

* Style changes only. No revision letter change required.

July 2004

*

Contents

Introduction 5

Functional Description 6

Specifications 7

Installation 9

Crush Point Hazards 10

Installation Procedure 11

Operation 15

Controls 16

Determining the Grip Operating Pressure 18

Adjusting the Output Pressure 19

Adjusting the Rate Control 20

Gripping Specimens 21

Removing Specimens from the Grips 23

Model 685.53 Grip Control Module Contents

3

4

Contents

Model 685.53 Grip Control Module

Introduction

Contents Functional Description 6

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.

Specifications 7

Hydraulic Grip Control

What you need to

know

Pressure

56

4

7

8

9

10

Rate

3

2

1

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 procedures. You are expected to know how to
perform the following procedures.

• Turning hydraulic pressure on and off

• Selecting a control mode

• Manually adjusting the actuator position

• Installing a specimen

• Defining a simple test

• Running a test

Model 685.53 Grip Control Module Introduction

5

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 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.

Hydraulic schematic The following figure shows the hydraulic schematic for the grip control.

Hydraulic
Output

Hydraulic
Source

-4P

Rate
Control

Pressure

030 DIA

Upper Grip

Grip

Pressure Reducing Valve

0.720.7 MPa
(1003000 psi)
adjustment range

Grip Control Manifold

030 DIA

-6R

Hydraulic
Return

Release

Release

Grip

Lower Grip

Model 685.53 Hydraulic Schematic

Hydraulic power unit The Model 685.53 Hydraulic Grip Control Module gets its hydraulic pressure

from the hydraulic power unit in the lab.

Control manifold The control manifold outputs the hydraulic control to the grips. The control

manifold includes all of the front panel controls.

Rate control The Rate control is a needle valve that restricts the hydraulic flow, and

determines how fast the grips clamp and unclamp.

Pressure control The Pressure control establishes the final output pressure to the grips. It works in

conjunction with another pressure reducing valve which is being used as a
pressure relief valve. These two valves work in the same fashion as the valves on
the supply manifold.

6

Grip control The grip controls port the final output pressure to the grips. Each grip has two

Introduction

ports, a grip port and a release port. The grip controls change the output pressure
from the grip port to the release port and vice versa. The controls also have a
midpoint where the hydraulic pressure is stopped at the grip control; this causes
the grip to stop its hydraulic movement.

Model 685.53 Grip Control Module

Specifications

The following table lists the hydraulic specifications for the grip control.

Parameter Specification

Maximum Input Pressure 21 MPa (3000 psi)

Specifications

Pressure Control Range

Pressure Stability
(at all pressures)

Grip and Pressure Fittings male, JIC 37º flare -6

Drain Fitting male, JIC 37º flare -4

0.7–21 MPa (± 0.06 MPa) (100–3000 psi (± 10 psi))

± 0.03 MPa (± 5 psi)

Model 685.53 Grip Control Module Introduction

7

Specifications

8

Introduction

Model 685.53 Grip Control Module