PAT DS 50 Operator's Manual

LOAD MOMENT INDICATOR

DS 50 / 0002

OPERATOR'S MANUAL

MANITEX

Second Edition 03/18/1997 – CSH (con:K2AA V1.0) 031-300-190014_A.doc

NOTICE

The information in this document is subject to change without notice.

PAT does not assume any warranty of any kind with regard to this material, including, but not

limited to the implied warranties of marketability and fitness for a particular purpose.

PAT shall not be liable for errors contained herein or for incidental or consequential damages in

connection with the furnishing, performance or use of this manual.

This document contains proprietary information, which is protected by copyright. All rights

reserved.

No part of this document may be photocopied, reproduced, or translated to another language

without the prior written consent of PAT.

Second Edition 03/18/1997 – CSH (con:K2AA V1.0) 031-300-190014_A.doc

TABLE OF CONTENTS

1 General Information 2

2 Warnings 2

3 System Description 3

3.1 System Function 5

3.2 Control Identification 6

4 Pre-Operational Inspection 9

4.1 Anti two-block devices 9

4.2 Pre- Operation Inspection and Calibration Verification 10

5 System Operation 12

5.1 Operating Mode Selection 12

5.2 Selection of the Reeving 13

5.3 Data Display 14

5.4 Error Display 15

5.5 System and Display test 15

6 Service and Maintenance 15

7 Troubleshooting 16

Second Edition 03/18/1997 – CSH (con:K2AA V1.0) 031-300-190014_A.doc

2

Operator's Manual DS 50 / 0002

1 GENERAL INFORMATION

The PAT Load Moment Indicator1 (LMI) DS 50 has been designed to provide the crane operator with the
essential information required to enable the machine to be used within its design parameters.

Using different sensing devices, the Load Moment Indicator monitors various crane functions and provides
the operator with a continuous reading of the capacity of the crane. The readings continuously change as
the crane moves through the motions needed to make the lift.

The LMI provides the operator with information regarding the length and angle of the boom, working
radius, rated load and the total calculated weight being lifted by the crane.

If non-permitted conditions are approached, the DS 50 Load Moment Indicator will warn the operator by
sounding an audible alarm and lighting a warning light.

Always refer to operational instructions and load charts provided by the crane manufacturer for
specific crane operation and load limits.

2 WARNINGS

The LMI is an operational aid that warns a crane operator of approaching overload conditions and warns of
overhoist conditions which could cause damage to equipment and personnel.

The device is not, and shall not be, a substitute for good operator judgment, experience and use of
accepted safe crane operating procedures.

The responsibility for the safe crane operation shall remain with the crane operator who shall ensure that
all warnings and instructions supplied are fully understood and observed.

Prior to operating the crane, the operator must carefully and thoroughly read and understand the
information in this manual to ensure that he knows the operation and limitations of indicator and crane.

Proper functioning depends upon proper daily inspection and observance of the operating instructions set
forth in this manual. We draw your attention to section 5 of this manual.

1

LOAD MOMENT: generally, the product of a force and its moment arm; specifically, the product of the load and the load-radius. Used in the

determination of the lifting capacity of a crane.

Operator's Manual DS 50 / 0002

The LMI can only work correctly, if all adjustments have been properly set. For correct
adjustment, the operator has to set the operating code and the parts of line (reeving) thoroughly
and correctly in accordance with the real rigging state of the crane. To prevent material damage
and serious or even fatal accidents, the correct adjustment of the LMI has to be ensured before
starting the crane operation

3 SYSTEM DESCRIPTION

The PAT Load Moment Indicator DS 50 consists of a central micro processor unit with build in length- and
angle sensor, operating console, pressure transducers, and anti-two block switch(es).

The system operates on the principle of reference/real comparison. The real value, resulting from the
pressure measurement is compared with the reference data, stored in the central processor memory and
evaluated in the microprocessor. When limits are reached, an overload-warning signal is generated at the
operator’s console.

The fixed data regarding the crane, such as capacity charts, boom weights, centers of gravity and
dimensions are stored in memory chips in the central processor unit. This data is the reference information
used to calculate the operating conditions.

3

The length/angle sensor mounted inside the cable reel, which is mounted on the boom registers boom
length and boom angle. The boom length is measured by the cable reel cable, which also serves as an
electrical conductor for the anti two-block switches.

Pressure transducers attached to the piston and rod sides of the hoist cylinder measure the crane load.

The console has two functions:

• displays information to the operator

• input terminal for operating mode and reeving (parts of line)

The operator’s console is mounted in the operator’s field of vision. For a better identification of displays
and operating elements, they are continuously backlit during operation.

Second Edition 03/18/1997 – CSH (con:K2AA V1.0) 031-300-190014_A.doc