MicroGuard
®
434/500 System — Troubleshooting Manual PN W453200 Rev C 08/01/00
GREER COMPANY 1918 E. Glenwood Place Santa Ana, CA 92705 Telephone: (714) 259-9702 FAX: (714) 259-7626
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Crane Systems
6.9.2 ZERO CALIBRATION
The computer must be able to identify where the ZERO point of the angle sensor has been set.
It is, therefore, necessary to calibrate the zero setting of the potentiometer.
Before continuing, make sure that the mechanical (physical) zero has been properly set,
as described in SECTION 6.9.1.
1. Using an inclinometer, set the boom to 0° (zero).
2. Enter the CALIBRATION MODE at the display console. (SEE SECTION 10.2)
3. Select Command 02, SENSOR ZERO. (See SECTION 10.4.3)
4. Select sensor No. 3.
5. Zero the extension sensor.
6. Before exiting the command, check that the displayed value is between -4 and +4.
6.9.3 SPAN C ALIBR ATION
The computer must be able to treat measurements of the angle provided by the angle sensor.
It is therefore necessary to calibrate the SPAN of the angle potentiometer.
Before continuing, ensure that the calibration zero has been properly set,
as described in SECTION 6.9.2.
1. Boom up to a high angle (at least 70°) and measure the angle with an inclinometer.
2. Enter the CALIBRATION MODE at the display console. (See SECTION 10.2)
3. Select Command 03, SENSOR SPAN. (See SECTION 10.4.4.)
4. Select sensor No. 3.
5. Calibrate the angle span using the angle as measured in step 1.
6. Before exiting the command, check that the displayed value is between -0.1° and +0.1°.
NOTE
The required accuracy of measured angles is within 0.2°.
When taking boom angle measurements; always use a good quality
inclinometer. Many inclinometers are only accurate at 0° (level). Ensure
that a reliable position on the top of the boom is used to measure the angle
and that the inclinometer will provide an accurate reading at 0° and at 70°.
SECTION 6
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