User's Manual

3 LS420 Universal User Manual V2.91 2003-01-21.doc
System Description and Features
The LS420 system detects and displays load and capacity related information and can
warn the operator when a limit is exceeded or a two-block event is pending. This system
is an operator aid and should not be solely relied upon for safe hoist operation. The op-
erator must at all times be fully aware of the approach of the hook block to the head
sheave, the length and angle of the boom and jib, the hoist and crane configuration and
rigging (including parts of lines, counter-weights, outriggers, rotation etc.) and the ap-
propriate capacity charts. This system is designed as a backup to the operator in the
event that he has exceeded the safe limits of the crane.
- Displays information from up to nine wireless sensors including load cells, angle sen-
sors, wind speed sensors and anti-two-block switches.
- Adjustable load limits and overload warning for hoists.
- Adjustable maximum and minimum angle limits with warning for booms and luffing jibs.
- Anti-two-block alarm and bypass.
- Waterproof.
- Multi-position mounting bracket.
- All sensors pre-calibrated.
- Parts of lines setting.
- Tare function.
- Bar graph display of percentage of load limit on load cells.
- Sensor battery status display and low battery warning.