Boom Truck Crane LMI Computer Replacement



Boom Truck LMI Replacement
Starting at $10,500
Simple to Use, Rugged Long Lasting, LMI Computer Replacement for Boom Truck Cranes
This boom truck load moment indicator LMI computer replacement is perfectly suited to boom truck cranes requiring a simple load monitoring solution.  The Rayco Wylie i4300 is the ideal replacement for old or non existent systems on National, Manitex, and Manitowoc systems and will bring your machine up to date with a 4.3 inch full color display, state of the art reliable sensors, and rugged long lasting trouble-free construction.  The RaycoWylie i4300 crane system supports multiple sensors including boom angle / length cable reel sensor, two load sensors, boom tip anti two block, and winds speed. Available for single reel telescopic cranes (hoist or total moment sensing) all sensors and the display itself are a minimum of IP67 water resistance rating.
  • Full load chart capabilities
  • Quick and easy installation
  • One screen display of load, hoist, parts of line, radius, boom length, boom angle and % of maximum capacity
  • Full lockout capabilities if installed on your crane
  • Operator adjustable low, high angle, length, height and radius limits
  • Audible and visual alarms
  • Diagnostic menu and continuous error detection and recording
Technical Data
  • Display Size 4.3 inch diagonal  3.66" x 7.80" x 1.65"
  • Screen Resolution 480 x 272
  • Operating Temperature -4 to 158 degrees Farenheit
  • Extended Temperature -40 to 158 degrees Farenheit
  • Supply Voltage 11 to 36 volts DC
  • Display Rating IP67
  • Accuracy Rating SAE J159
  • USB Upload Cabability
  • Multi Language:  English, Spanish, French
Recent Crane LMI Computer Projects
We have provided LMI computer replacement options and/or parts for hundreds of customers over the years.  Here are a few of the most recent complete LMI computer replacement system jobs.  Most of these jobs involve the replacement of an aging LMI system that has become unreliable however the crane itself is in great shape and continues to be used.  Some of our customers come to us without any LMI on their crane and we work with them to get a complete new system for them.
National Boom Truck Crane
  • Complete new crane computer
  • Wired dynamometer secured at top of main section
  • Reuse current A2B switch
  • New cable reel with integrated angle sensor
  • Full load chart programming
  • Full lockout capabilities
Project Overview
We usually complete several of these boom truck systems a year for customers, many of whom are in the tree service industry.  The National boom truck is particularly simple as it requires only a load sensor and a cable reel.  The original anti two block system can be reused if it is in good condition, thereby saving that expense.  Programming is simple and the customer gets a full color display with full load charts and lockout capabilities.
Boom Truck Crane Computer
Individual component specification sheets
4.3" Full Color Display
Full Can-Bus I/O Computer Interface
Load Sensing Dynameter
Boom Length - Angle Cable Reel
The i4300 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 or the tension in the hoist rope, the boom angle and length, and it indicates safe or critical conditions, while performing an authorized lift of loads.

All the sensors are linked through a single CAN Bus (Controlled Area Network). The pressure sensors or a dynamometer provide electrical signals that are proportional to ther load lifted. 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 i4300 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).

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.
Boom Truck LMI Replacement
Wiring Diagram
About Boom Truck Cranes
What is a Boom Truck? 
There are different types of boom trucks used in various industries, but all boom truck cranes have three essential characteristics: 

  • A boom truck is a commercial truck with a hydraulic crane mounted to a truck style vehicle with a winch for hoisting the loads.  Boom trucks are important cranes on many types of job sites. They’re more maneuverable than other types of cranes and are typically faster and better at stacking objects than larger vehicles. 
  • ‌A major advantage of the boom trucks is the flatbed that can carry loads like any other flatbed truck. In some cases, the flatbed will have storage added instead of a flatbed, giving operators ample area to store equipment. 
  • The fixed cab is a standard truck with the boom lift on the back. The driver can operate the boom from the front. The downfall of this option is that the person operating the machine cannot see where it is going.  With the swing cab, the operating booth attaches to the lift and, therefore, moves with it. Some have open riding seats, which don’t protect a worker from the outdoor elements. However, they also shift in the same direction as the crane, making it easier for the operator to see what they are doing.
  • Rear mount boom trucks have a boom lift mounted on the back. Sometimes the boom lift faces the front of the vehicle, and the machine sits in the back. Manufacturers refer to this placement as a rear mount.
  • A personnel hoist attachment for lifting workers to reach inaccessible areas like power lines or the tops of trees. Many boom trucks have a winch or a hoist/bucket. If your job site requires both, you might want to consider renting a second boom truck to save project time. 

Why a Boom Truck 
‌Probably the biggest advantage of a boom trucks is their ability to drive like regular trucks at comfortable highway speeds. They can move freely on public roads between jobs and store everything needed for their operation on board.

Boom trucks are great for lift jobs under 40 tons and are a practical choice for contractors due to their maneuverability. Boom trucks drive like regular trucks, making them more manageable than other types of cranes. They can also travel down freeways at reasonable speeds, unlike other types of cranes.  The use of boom trucks is widespread in a variety of industries, from building and construction to tree trimming services and utility companies.
Boom Truck Crane LMI Replacement Brochure
Experts in the LMI Crane Computer Industry
The founder of BTS has been in the LMI crane computer industry since 1984 as an engineer at PAT-CTI in England, then as a founding team member of PAT Hirschmann in Chambersburg PA, and later as an independent business owner specializing in complex service repairs on large Demag and Liebherr cranes.  BTS technicians have completed work all over the US, South America, Africa, and Europe.  Our customer base truly does span the entire globe
As experts in the crane LMI computer industry, BTS has often been asked to publish advice in Crane & Rigging Hot Line magazine
Wiring & Insulation Issues
Addressing two key issues of insulation and wire gauge on live wires in the crane computer LMI system.  Especially prone to neglect are wires and cables that run between the sensors and the main console / central unit computer.  Over years of weather exposure there can be significant deterioration that results in incorrect sensor readings and unreliable error code messages
About LMI Load Moment Indicators / Crane Computers
A Load Moment Indicator LMI crane computer system operates on the principle of reference/real comparison. The real value, resulting from the pressure measurement and geometric sensors, is compared with the reference data stored in the central processor memory and is evaluated in he microprocessor. An analog indication of % capacity is displayed via an boom truck crane operator’s console. When limits are reached, an overload warning signal is generated. At the same time, the crane movements that increase load moment such as hoist down, telescope out, and boom down will be locked out.  The fixed data regarding the crane, such as dimensional data, capacity charts, boom weights, and centers of gravity 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, located inside the cable reel, 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 switch.  The crane load is measured by pressure transducers attached to the piston and rod side of the lift cylinder.  Controls on the operator’s console allow the operator to select the operating mode (main boom, jib, etc.) as well as the parts of the line currently in use. The system will then limit operation to the capacities on the selected load chart, or the maximum permissible line pull in that configuration.  After the engine is started and the PTO is engaged, the LMI powers up and conducts an automatic test of the complete system.  After two successful system tests without errors, the system is ready for operation. In case of a system error, both the overload and anti-two-block lights on the central unit will illuminate.  The interactive user guidance considerably simplifies the input of operating modes as well as the setting of geometry limit values

The LMI crane computer is an operational aid that warns a boom truck operator of approaching overload conditions and over hoist 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 the operators manual
i4300 Display Training Video
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