Fairbanks Aegis Coil Scales - Manual (Page 31)

Section 4: Service & Maintenance
04/10 31 51205 Rev. 2
5.3. SCALE PLATFORM TROUBLESHOOTING
Except for severe structural damages, most Platform
Assembly problems can be traced to the following causes.
• Material under or around the Platform
• Incorrect, loose or damaged Load Cells
5.3.1. Scale Platform Testing
5. Inspect the Interface Cable from the Platform to the Instrument for visible breaks
or cracks.
6. ZERO the Instrument Display.
7. Apply a test load of 25% of the Load Cell capacity to one corner.
─ The Instrument should display a weight reading within 0.1% of the applied
weight, or One Instrument Division, whichever is greater.
8. Repeat Step 3 for all the corners, placing the same Test Load on each corner.
5.3.2. Load Cell Testing
When corners do not match the correct tolerances, disconnect the leads from the
summing card’s terminal strip and test the load cell using the settings on the following
chart.
.
TEST READING REMARKS
Green to Black (Input) 1106 Ohms (+5 / -2 Ohms) Input Resistance
Red to White (Output) 1000 Ohms (+5 / -2 Ohms) Output / Bridge Resistance
Yellow (Shield) to Load Cell Case
More than 1,000 megohms Insulation Resistance Input and Output Leads to Shield
Input and Output Leads to Case