Principle Of Load Meter Measurement - Komatsu WA500-6H Operation & Maintenance Manual

6.1 Handling load meter
6.1.2

Principle of load meter measurement

To allow you to obtain precise measurements with the load
meter, it is necessary first to understand the measurement prin-
ciple. When carrying out calibration and when making actual
measurements, it is important to remember the following points.
Conditions for starting measurement
The conditions for starting the measurement must fulfill the fol-
lowing.
The lift arm angle (the angle between the horizontal and the line
connecting the lift arm pin and bucket pin) must be within -30°
and -10° (horizontal is 0°, so the angle must be below horizontal
(marked with a - sign); the angle above horizontal is marked with
a + sign).
When the lift arm is raised, if the lift arm starts from an angle
below -30°, no measurement is carried out until the lift arm
reaches -30°.
If the lift arm is operated RAISE -> STOP -> RAISE AGAIN, this
is judged as one load, and no measurement is carried out when
the lift arm is raised again.
If the lift arm is lowered and then raised, the next measurement
is carried out.
Conditions for completing measurement
The measurement is completed if any of the following conditions
are fulfilled.
When the lift arm is stopped (angle speed: less than 0.5°/
sec)
When the lift arm angle exceeds +20°
When the lift arm RAISE speed is greatly reduced (less than
70% of angle speed for previous 1 second)
Conditions for successful measurement
To complete the measurement successfully, it is necessary to
continue to raise the lift arm for at least 1.5 seconds after starting
the measurement. If the lift arm is stopped before 1.5 seconds
has passed, the operation will be ended without making any
measurement. (The display stays at 0 tons.)
6-4
+20°
0°
-10°
-30°
Attachments, Options
GK050275
WA500-6H – VEAM430100