SkyAzúl Greer MG514, Installation, Calibration, And Service Manual

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3.3.5.2 Displayed Load or Radius Errors
This section gives direction to fault diagnosis of load and radius errors. Load or radius errors can cause
early or late tripping of overload alarms. Accuracy of load, radius, length, and angle is determined by
the correct installation and maintenance of the system sensors. Accuracy of load is governed by the
radius accuracy, and the extension, angle, and pressure sensors. Accuracy of radius (unloaded) is
governed by the extension and angle sensors.
Ensure there are no system faults before continuing.
Check Boom Extension
1. Ensure the boom is fully retracted.
2. Ensure the reeling drum cable is correctly layered as a single layer across the reeling drum
surface. Any stacking of the cable will cause extension errors when the boom is fully retracted.
This will cause the System to exceed the 0.5 ft tolerance allowed by the computer for boom
mode selection. If the reeling drum cable is stacking on the reel, see SECTION 3.8.1
CHECKING THE REELING DRUM CABLE LAYERING.
3. Check the zero of the extension sensor with the boom fully retracted. Enter the Calibration
Menu and use the “SPAN” command. Select sensor No. 2 to view the extension value in feet.
The value of extension must be between -0.2 and +0.2, with the boom fully retracted. If the
extension value is incorrect, refer to CHAPTER 2 - CALIBRATION. Fully telescope the boom
and ensure the displayed boom length value matches the maximum length of the boom. If the
length value is incorrect, follow the EXTENSION SPAN procedure in SECTION 3.10.4 SPAN
CALIBRATION.
Check Main Boom Radius
1. Fully retract the boom and ensure the crane configuration is correctly set up.
NOTE: The required accuracy of taped radius measurements is within 0.1 feet. When taking radius
measurements use a good quality tape that does not stretch. The tape should be graduated in feet and
tenths of a foot. Always measure between the swing center of the crane and the hook line, using a
single part of line with the crane centered over front (rough terrain) or centered over rear (truck crane).
2. Raise the boom to about 45° and measure the radius. The measured radius must match the
displayed radius /- 0.2 ft. If it does not match, continue to the “CHECK BOOM ANGLE”
procedure. If it does match, continue to “CHECK PRESSURE SENSORS.”
3. Raise the boom to a high angle (at least 70°) and measure the angle with the inclinometer.
Ensure the displayed angle matches the inclinometer reading within 0.2°. If the displayed angle
is incorrect, follow the angle span calibration procedure in SECTION 3.10.4 SPAN
CALIBRATION.
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