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to, the implied warranties of merchantability and/or its fitness for a particular purpose.
PAT America, Inc. will not be liable for errors contained in this manual or for incidental or
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The drawings, photos and data are confidential and cannot be used or reproduced without the written
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All information in this document is subject to change without notice.
MANUAL REVISIONS
REV DATE NAME DESCRIPTION
- 2/22/02 MO ECN 02-64
A 11/11/02 CH ECN 02-278
B 05/19/03 SB ECN 03-065
C 02/22/05 MS ECN 05-041
D 01/06/06 SB ECN 05-217
E 11/12/08 WG ECN 08-179
(LMI) has been designed to provide the crane operator with
the essential information required to operate the machine 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 crane’s capacity. 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 Load Moment Indicator will warn the operator
by sounding an audible alarm, lighting a warning light and locking out those functions that may
aggravate the crane’s condition.
2 WARNINGS
The LMI is an operational aid that warns a crane operator of approaching overload conditions
and of overhoist conditions that 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. Refer to Section 6. Pre-Operation Inspection and Calibration Verification of this handbook.
The LMI can only work correctly, if all adjustments have been properly set. For correct
adjustment, the operator has to answer thoroughly and correctly all questions asked
during the setup procedure 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.
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
The PAT Load Moment Indicator consists of a central micro processor unit, operating console,
length/angle sensor, pressure transducers, and anti-two block switches.
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 micro processor. When limits are reached, an overload
warning signal is generated at the operator’s console. At the same time, the aggravating crane
movements, such as hoist up, telescope out and boom down, will be stopped.
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.
Boom length and boom angle are registered by the length/angle sensor, mounted inside the
cable reel which is mounted on the boom. The boom length is measured by the cable reel cable
which also serves as an electrical conductor for the anti two-block switches.
The crane load is measured by pressure transducers attached to the piston and rod side of the
hoist cylinders.
The interactive user guidance considerably simplifies the input of operating modes as well as
the setting of geometry limit values.
Upon switching on, the system starts with an
automatic test of the LMI system, of lamps
and audible alarm. During the test, the LC
display shows the initial logo.
If the system was turned off for more than
two hours, the setup configuration has to be
entered after the system test. (⇒ chapter 4)
Operator's Manual iFLEX5
First, the operating mode is determined by
an interactive step-by-step interrogation of
the rigging states.
Next is the interactive input of the reeving.
Now the LC display shows in symbols all
inputs and awaits acknowledgment or
canceling.
Upon acknowledgment of the inputs the
system is ready for operation.
• inputs by the crane operator (operating mode, reeving)
• input of geometry limit values and signalization of exceeded limit values
• display of important data and information
The operator’s console is mounted in the crane’s cab in the operator’s field of vision. For a
better identification of displays and operating elements, they are continuously backlit during
operation.
3.3 CONTROL IDENTIFICATION
This unit contains a display and different controls which are described as follows:
Legend to Fig 2:
1 LC Display Area 10 Button and Control Light "INFO"
2 Load Moment Limit Light 11 Button and Control Light "CONTROL"
3 Load Moment Prewarning Light 12 By-Pass Key Switch
4 Alarm Light “Anti-Two-Block” 13 Button and Control Light "By-Pass Anti-Two-Block"
5 Override Key Warning Light 14 Button and Control Light "By-Pass LMI shut-off
function"
6 Button “Alarm Stop” 15 Contrast Control
7 Button and Control Light “TARE” F1 Button "Function 1"
8 Button and Control Light “LIMITS” F2 Button "Function 2"
9 Button and Control Light “SELECT F3 Button "Function 3"
OPERATING MODE” F4 Button "Function 4"
F5 Button "Function 5"
1 LC Display Area 10 Button and Control Light "INFO"
2 Load Moment Limit Light 11 Button and Control Light "CONTROL"
3 Load Moment Prewarning Light 12 By-Pass Key Switch
4 Alarm Light “Anti-Two-Block” 13 Button and Control Light "By-Pass Anti-Two-Block"
5 Override Key Warning Light 14 Button and Control Light "By-Pass LMI shut-off
function"
6 Button “Alarm Stop” 15 Contrast Control
7 Button and Control Light “TARE” F1 Button "Function 1"
8 Button and Control Light “LIMITS” F2 Button "Function 2"
9 Button and Control Light “SELECT F3 Button "Function 3"
OPERATING MODE” F4 Button "Function 4"
F5 Button "Function 5"
The LC display visualizes graphical symbols, texts and numerical
values. Depending on the selected operating mode (setup, limit mode
or LMI representation), the corresponding information is indicated on
the display.
Please refer to the description of the different operating modes for the
signification of the individual elements.
The red LOAD MOMENT LIMIT LIGHT (2) warns the operator that a
rated load condition has been reached. It lights up when the load on
the crane reaches the crane load capacity. The audible alarm also
sounds when this condition has been reached.
The following crane movements will be stopped concurrently:
− hoist up
− telescope out
− boom down
Load Moment Prewarning Light
The yellow LOAD MOMENT PRE-WARNING LIGHT (3) will light up
when the load on the crane reaches the defined prewarning area,
thus indicating that an overload condition is approaching.
This means for the operator to continue his crane operation with
extreme caution.
Alarm Light “Anti-2-Block”
The red “Anti Two-Block Alarm Light” (4) lights up when the anti-twoblock limit switch contacts open, indicating that a two-blocking
condition is approaching. At the same time the audible alarm will
sound.
The following crane movements will be stopped subsequently: hoist
up, telescope out, boom down.
Override Key Warning Light
The red OVERRIDE KEY WARNING LIGHT (5) flashes to indicate
that the cut-off function of the A2B / LMI system is deactivated.
Button and Control Light “Alarm Stop”
This ALARM STOP BUTTON (6) allows the audible alarm to be
silenced for approximately 15 seconds by pressing this button.
Reference ⇒ “Audible Alarm” (12).