Brief Description Of The I3500 System - RaycoWylie i3500 Instruction Manual

1.4

Brief description of the i3500 System

The i3500 is a computerized crane monitoring system, designed as an operator
aid. It comprises sensors fitted to the crane and a display located in the cabin of
the crane. This version measures the boom cylinder pressure, the boom angle
and length, and it indicates safe or critical conditions, while performing an
authorized lift of loads. Optional sensors may also be fitted to monitor the slew
angle and the rotation of the hoist drum to provide some extra information to
the operator.
All the sensors are linked through a single CANbus (Controlled Area Network).
The pressure sensors provide electrical signals that are proportional to the
actual pressures in the hydraulic boom cylinder system of the crane. An
inclinometer provides a signal that is proportional to the boom angle and a
reeling drum provides a signal that is proportional to the boom extension. The
radius and the load are calculated from these signals with the dimensional
crane data preprogrammed in the i3500 system.
During operation the load lifted by the crane is calculated from the measured
boom cylinder pressure and is automatically compared with corresponding
data related to the maximum permissible crane loading.
The actual load is expressed as a percentage of the permitted load (% SWL).
If this percentage exceeds a preset value, alarms and safety functions are
activated. The values of the hook load, the permissible load, the main boom
angle and the radius are displayed in a digital form on a graphic liquid crystal
display (LCD).
If the additional sensors are fitted, then some information about the current
slew angle and the hook height will also be available. The required crane duty
charts are stored in a non-volatile memory and can only be modified with
the approval of the crane manufacturer. The calculated crane parameters
and calibration data are stored in an additional non-volatile memory. The
calibration of the system is performed only with the use of known loads, boom
angles, and other pre-determined data.
Audible alarms
An intermittent buzzer located in the i35000 system display warns the crane
operator to take specific course of actions at the approach of the rated capacity.
The threshold of the approach alarm has been fixed at 95% of the rated capacity.
The buzzer will alert in a continuous way when the rated capacity is reached
or exceeded (≥ 100%). Personnel in the danger zone are warned by an external
buzzer so that they can get out danger when the rated capacity limiter is
activated or overridden.
Telescopic Cranes Pressure Sensing
(Continues on next page).
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i3500 Introduction
Instruction Manual