Inspect Junction Box Wiring
1. Connect the junction box to the indicator.
2. Open the junction box cover and check wiring for the following:
•
Wires connected to proper connection point, by color code.
•
Terminal blocks are clamped onto metal lead, not insulation.
•
Connections are tight.
3. Check for water or condensation in the junction box. If damp, dry the entire box and
printed circuit board thoroughly with a hair dryer.
NOTE: No hazardous voltages are present in the junction box.
Test the Junction Box
NOTE: Test the indicator using a simulator and inspect the junction box wiring (pages 9
& 10) before testing the junction box.
1. Disconnect all load cell wires from junction box.
2. If the failure mode does not change and the indicator checked out OK earlier (page 10),
the junction box is defective. Be sure to test load cells using an ohm meter (see page
11) to assure that they have not been damaged.
3. If the display stops flashing and stabilizes at a weight, the junction box is OK.
Testing the Load Cells
Using Working Indicator & Junction Box
1. Disconnect all load cells from the junction box.
2. Connect one load cell to any junction box terminal. Be sure connections are tight and
connected to proper locations by color code.
3. Observe a positive weight change after each load cell is connected. Record the
reading of each load cell.
Load cell is bad if it causes:
•
indicator to flash “±RANGE”
•
indicator to display a negative weight (check for upside down load cell)
•
indicator to become unstable
