SI 675
Issue B
EDI 8262
Telescopic cranes with derrick pressure sensors CALIBRATION W2245
8
2.6.2 The W2245 CPU board
The Central Processing Unit board reads all the sensor signals delivered
from the I/O board. On the left of the board is situated a multiplexed amplifier
which conditions load cell input. This board can multiplex 2 load sensor
signals. Using the stored calibration data, the CPU converts the signals into
information for hook load. The CPU then compares the information with the
set limits entered by the operator, and the current duty. The CPU will finally
trigger the alarms if a limit is reached or lockout output if overload or Two-
Block situation is sensed.
This board is the operator interface. It carries the alpha-numerical Liquid
Crystal Display (LCD) which provides information such as hook load, boom
angle, preset limits, failure messages, hoist used and parts of lines, and also
the processing circuitry for the 8 button keypad.
The Gain setting is located on this
board, and are denoted JA,JB,JC. 3
small jumpers are used to configure it.
The default value is 333
