55M3500MNE rev. E
Telescopic cranes with derrick pressure sensors Calibration Manual i3500
35
Before proceeding with additional calibration work check the overall performance by
moving just the hook around the working envelope; i.e. high/low angles and long/short
boom. Ensure that any variation of load reading is no more than 1 to 2 percent of the
SWL at that position. If greater variation is seen then check geometric dimensions
entered in calibration mode, use more calibration angles and lengths, or proceed to add
load correction calibrations (see separate section). Always check results at this stage
after booming up. Boom down can be checked after the full calibration is completed.
2.2.10.7
Unloaded boom deflection
This procedure is used to add an allowance into the calculation of the hook radius to
compensate for boom and/or chassis deflection before a load is lifted. A separate
calibration is available for each crane configuration that also has an individual no load
calibration. This procedure should only be used for machine configurations on
outriggers or on crawlers, a separate routine is used to compensate for lifting on tires, if
relevant, see section 2.2.9.8. For rooster configurations the unloaded deflection
characteristics of the main boom will be inherited and a separate calibration is not
required and should not be attempted.
Ensure that the current duty selection matches the actual crane configuration to be
calibrated. Navigate through the calibration menu using
“
” or “
” to highlight the
field “- unloaded boom deflect.”, press
“
” to confirm this choice.
The display will show the current boom length and a target boom length for calibration.
With the hook block suspended, telescope the boom out to the target length specified
on the display, this is normally the maximum length available for the duty so be sure to
check that the hook block does not foul the boom tip and that the boom is at a high
enough angle to safely permit maximum extension.
When the boom is at the disired extension the display will change to show:
-
to continue
Press
“
”, the display will change to show the current boom angle and a target boom
angle for calibration, normally 60°.
Adjust the boom angle to the target angle, when the boom is at that angle for calibration
the display will change to show:
-
to continue
Press
“
”, the display will change to show:
– unloaded boom defle
load:
radius:
length:
corr:
x.x°
-
up or down to edit
-
to accept
