LSI-Robway RCI-1550 LM, Instruction Manual

Page: 47 / 97

7.9. Preparation Before Calibrating Load
Load calibration is a simple procedure, however, before the load can be calibrated the installer must
make sure that the following procedures have already been done:
 Correct duty, falls and winch have been selected,
 The user configurable options have been checked and correctly set up,
of special importance
is the crane geometry information, (please refer to function code listing and the configuration
sheet),
 The boom angle has been calibrated and checked for accuracy.
 You should also check that the angle readout is stable. If you find that the angle display is
unstable use the function "NUMBER OF SAMPLES TO AVERAGE" to activate averaging thus
making the display more stable. You should set the number of samples to 3 initially and check
the display. You may have to experiment a little to find a compromise which gives you stable yet
fast enough angle display. If you require a number larger than 8 you should first check that there
is no problem with the actual installation, ie. check that there is no moisture in the cable plugs,
the cable is not pulled as the boom is being luffed and that the cable/angle sensor are not
damaged.
Only on very dynamic cranes would a number larger than 8 may be required.
 Transducers have been calibrated and checked. The transducers must be calibrated using a
ROBWAY load-cell simulator with a 10 position switch, to set the zero and full scale points. This
is done through functions "CALIBRATE LOW END OF TRANSDUCER" and "CALIBRATE HIGH
END OF TRANSDUCER". If using two transducers then both have to calibrated, if only using
one then only TRANSDUCER 1 needs calibration
(refer to previous sections of this manual)
.
Alternatively, if no simulator is available, you can also calibrate the low and high of the
transducers by simply activating function code, “Alter Cal Data” and enter the low and high cal
values of the amplifiers.
Please no te that the follow ing procedu res must be done for
every duty selectable
7.10. Calibrating Active (selected) WINCH
Make sure that the correct duty and falls are selected for the crane setup and that the correct WINCH
is selected before proceeding. For duties where a jib is installed make sure that its hook block is
hoisted up as far as possible, without being able to contact the jib tip sheave.
Luff the boom down, safely, to the lowest boom angle allowed by the load-chart. The lower the boom
angle the more accurate the calibration will be. If the hook block is swinging or the boom is not stable,
wait until they stop moving.
 Ensure the correct duty is selected
 Activate function "CALIBRATE ACTIVE WINCH",
 Enter the precise weight of the ACTIVE WINCH hook block plus the weight of the wire rope
between the hook block and the boom sheave and then press ENTER,
 When prompted, enter the section number that is being calibrated. Section number “1” for fully
retracted boom and Section number “17” for fully extended boom.
 Follow the text screen instructions which will request a Low and High position of the boom.
 Check the accuracy of the load display with a known weight, about 50% of the maximum SWL if
possible.
 Repeat steps 2 to 6 for as many sections as are required. Proportional booms should only
require section number 1 calibrated on fully retracted boom and section number 17 calibrated on
a fully extended boom. With some sequential booms it may be necessary to repeat this step at
more intermediate lengths (e.g. section 8, then 4 and 12) in order to improve the accuracy in
those regions.
 Repeat steps 2 to 6 for each load hoisting winch installed on the crane.
 Repeat steps 2 to 8 for each duty that requires calibration.