SkyAzúl Krupp EKS 83, Руководство по обслуживанию

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Selection of lifting capacity chart
Selection of lifting capacity tables
The system selects the correct lifting capacity according to the operating mode set on the central
unit and current boom configuration (length, telescope status, boom length).
Calculation of the radius
The radius is calculated from the boom length and angle as well as from the boom load derived from
the hydraulic pressure measured in the derricking cylinder, taking the deflection of the boom Into
consideration. When the operating mode has been set the length of the boom and fixed angle
position of the boom extension are included in the calculation.
Calculation of the reference value
Using the radius and boom length as a reference, the corresponding reference value (= maximum
load with selected crane configuration) Is selected from the lifting capacity table. The reference value
is reduced, depending on the reeving mode set on the central unit.
Calculation of the load
The pressure measurement in the derricking cylinder produces a Signal which is proportional to the
measured load moment. After subtraction of the inherent moment of the boom, the actual load is
calculated, taking into account the reeving configuration set on the central unit.
Warning and shutdown in case of overload
Reference value and calculated load are continually monitored and compared. If the load reaches
the warning threshold
(90% of the reference value). a warning is activated (Intermittent buzzer,
"Warning" relay, status indicator). If the load reaches the shutdown threshold (100% of the reference
value), shutdown is activated. A continuous buzzer sounds and the red LED warning light
"Shutdown" comes on. The "Shutdown" relay interrupts the power supply to the SU valve. The valve
switches over and blocks the control pressure for the crane functions. The shutdown is displayed on
the status display.
Measurement of variables
Data sensing

Boom angle to the horizontal with pendulum-driven potentiometer.

Boom length with potentiometer. driven by length measuring rope or wire and gear unit

Derricking cylinder pressure with two pressure sensors in the lower chamber (piston surface
chamber) and the upper chamber (piston ring surface chamber) of the derricking cylinder.
Data translation and transmission
The measured values are digitized in the data transmitter, converted into telegrams and transmitted
time-delayed as impressed current to the central unit through the common dual-line data bus.
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