MTS 512-01 User Manual

Model 512.01 Hydraulic Power Unit
Product Information Manual



015-206-301 A

Copyright information © 2000 MTS Systems Corporation. All rights rese rved.

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

DTE is a registered trademark of Mobil Corporation.
Tellus is a registered tradema r k of Shell Oil Corporation.
Synasol is a registered trademark of Union Carbide 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

015-206-301 A

October 1998

Contents

Introduction 5

Functional Description 6
Component Identification 8
Specifications 10
Dimensions 11

Installation 13

Operation 17

Maintenance 19

Reducing the Fluid Temperature 20
Adding Hydraulic Fluid 21
Resetting the Thermal Overloads 22
Adjusting the Output Pressure 23
Changing the Filter 24
Changing the Hydraulic Fluid 25

Model 512.01 Hydraulic Power Unit Contents

3

4

Contents

Model 512.01 Hydraulic Power Unit

Introduction

Contents

Functional Description 6
Component Identification 8
Specifications 10

This manual documents the Model 512.01 Hydraulic Power Unit (HPU),
also called a hydraulic power supply, HPS, or pump. This compact
hydraulic power unit is designed for use with low force testing systems. It
includes an air cooled heat exchanger to maintain the operating
temperature range.

l

Model 512.01 Hydraulic Power Unit

What you need to

know

Model 512.01 Hydraulic Power Unit Introduction

MTS Systems Corporation assumes that you know how to use your
controller. See the appropriate manual for information about performing
any controller-related step in this manual’s procedures. You are expected
to know how to perform the following procedures:

• Using the controller hydraulic power unit controls in conjunction with

the control located on the HPU.

• Controlling hydraulic fluid flow to other hydraulic equipment.

5

Functional Description

The hydraulic power unit (HPU) is the mechanical source of high-pressure
hydraulic fluid required to operate the hydraulic components of a test
system. See “Component Identification” on page 8 for more information
about the components described in this section.

Pump motor

Pressure

Filtering

Heat exchanger

A motor drives a hydraulic pump which draws hydraulic fluid from a
reservoir and pressurizes it to 6.9 MPa (1000 psi). The pressurized fluid is
made available to the hydraulic components in your test system.

The HPU pressure output is adjusted with a pressure reducing valve which
is factory set to 6.9 MPa (1000 psi). If the output pressure exceeds the
pressure setting, a pressure relief valve shunts the excessive pressure to the
hydraulic return line. The output pressure can be set to 6.9 MPa (1000 psi)
or less.

The filtration system protects against silting by cleaning the hydraulic fluid
to an ISO particle count of 14/10 or better. The filter change gage indicates
when the filter needs to be changed.

A suction strainer protects the pump from larger particles when the fluid is
pumped from the reservoir. It is located in the bottom of the hydraulic fluid
reservoir.

Hydraulic fluid temperature is maintained with a heat exchanger that cools
the fluid. The heat exchanger helps keep the temperature of the hydraulic
fluid between 43–52°C (109–126°F). The temperature of the fluid is
monitored by an overtemperature switch. If the fluid temperature exceeds
55ºC (130ºF), a switch opens and shuts down the HPU. The system cannot
be restarted until the fluid cools.

6

Electronics

Introduction

The air-cooled heat exchanger cools the hydraulic fluid as it passes
through a radiator. A fan blows air through the radiator to transfer heat
from the radiator to the air.

The HPU has basic controls to turn it on and off. The HPU includes a
connector to add a remote Emergency Stop switch. The HPU requires an

Emergency Stop switch or a jumper plug to be installed in order to run.

Model 512.01 Hydraulic Power Unit

Hydraulic

schematic

Pressure

Gage

Pressure

Reducing

Valve

Motor

The hydraulic schematic shows how the hydraulic components are
connected in the Model 512.01 Hydraulic Power Unit.

Pressure -6

37° JIC Flare

Check

Valve

Set at 7 MPa

(1000 psi)

Set at 7.9 MPa

(1150 psi)

Pressure

Relief

Valve

Return -6

37° JIC Flare

Air-Cooled Heat

Exchanger

Drain -06

37° JIC Flare

1/2 NPT
Strainer

Pump

Filter

with

Bypass

Temperature Gage

Fan and Motor

Overtemperature

Switch

Set at 55°C (130°F)

Low Fluid

Switch

Model 512.01 Hydraulic Power Unit Introduction

7

Component Identification

This table describes the components shown in the figure called

“Component Identification” on page 9.

Component Descriptions

OMPONENT

C

Filter

Low Fluid and
Overtemperature Sensor

Pump Motor
Jumper Plug

Control Box

Start Button
Stop Button
Reset Button

Heat Exchanger
Fluid Thermometer

D

ESCRIPTION

Provides 3–micron filtration to fluid returning to the reservoir (see

“Changing the Filter” on page 24).

Shuts the pump off if fluid becomes hotter than 55ºC (130ºF) or it detects
a low fluid level. See “Reducing the Fluid Temperature” on page 20 or

“Adding Hydraulic Fluid” on page 21 for more information.

Drives a fixed displacement gear pump.
Allows the HPU to run. Either the jumper plug or an external

Emergency Stop switch must be plugged into the control box before

the HPU can be started.
Houses the electronic controls for the pump, including the start button,

stop button, reset button, and the thermal overloads.
Turns the pump on. It produces an output of 6.9 MPa (1000 psi).
Turns the pump off.
Resets the thermal overloads of the HPU. See “Resetting the Thermal

Overloads” on page 22.

Cools the hydraulic fluid using an air cooled heat exchanger.
Displays the temperature of the hydraulic fluid.

Filter Change Gage

Pressure Gage

Reservoir

Sight Glass

Introduction

8

Shows when it is time to change the hydraulic filter. The gage is marked
with three zones: green, yellow, and blue.

Green—The filter is good to use.
Yellow—Change the filter soon.
Red—Do not run the HPU until you have replaced the hydraulic filter

element.
Shows the current output pressure from the HPU. The output pressure is

factory set to 6.9 MPa (1000 psi). See “Adjusting the Output Pressure” on
page 23 to change the output pressure.

Stores the hydraulic fluid. The reservoir has a 40 L (10 gal) capacity. It
includes a magnetic drain plug to help catch metal particles.

Let’s you see the hydraulic fluid. You can quickly check the hydraulic
fluid’s temperature, level, and condition (by its color).

Model 512.01 Hydraulic Power Unit

Filter

Low Fluid/Over Temp. Sensor

Pump Motor

Jumper Plug

Fluid Thermometer

Filter Change Gage

Pressure Gage

Reservoir

Sight Glass

Control Box

Start
Stop

Reset

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Component Identification

Heat Exchanger

Model 512.01 Hydraulic Power Unit Introduction

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