SI 675
Issue B
EDI 8262
Telescopic cranes with derrick pressure sensors CALIBRATION W2245
20
Press ENTER to ‘free’ the extension value (it will flash) and use the set
buttons (#2 and #4 ) to adjust the displayed value. When correct, press
ENTER (#1) to request calibration, press ENTER again to confirm. The
value should be set in metres or feet as defined on the display at start-
up.
4.2.8 - PRESSURE SENSOR CALIBRATION
4.2.8.1Pressure Sensor Zero Calibration (Steps 6 and 7)
To zero the pressure sensors, open the hydraulic lines to both sensors
in order to remove any residual pressure. Make sure the boom is
resting at its lowest point to prevent sudden fall when the line is
opened.
The pressure sensor must be connected according to the schematics
for normal operation.
Scroll to menu 6 ZERO PRES BORE. And press ENTER. The reading
on the upper right corner is in bits. The total scale is 1023. The display
should read between 20 and 50 bits, 235 and 325 when connected
through an amplifier. Press ENTER to zero and press ENTER again to
confirm.
With an amplifier, if the reading is above 325 and below 450, the
resolution of the system will be lower.
To zero the rod pressure sensor (annulus), Scroll down to 7-ZERO
PRES. ANN. Press ENTER. The value on the upper right corner will be
greater than the bore side pressure sensor
The expected reading should be between 100 to 200, or 300 to 400
when using an amplifier. If below these values, negative pressure may
cause the load reading to drop substantially when a load is left hanging
on the hook for an extended period of time. If the value is above 400,
the resolution will diminish.
4.2.8.2 Pressure Sensor Span (Bore Side)
Calib:#2
↑
- #4
↓
6 – Zero Pres Bore
Calib:#2
↑
- #4
↓
7 – Zero Pres Rod
Calib:#2
↑
- #4
↓
8 – Span Pres Bore
