CHAPTER 2 DIAGNOSTIC GUIDE
2.2.3 Checking Load Cells for Trouble
This section contains three methods of testing the Load cell.
1.
Perform a
Ramp Test
. (See Appendix B.) If the Ramp Test passes, continue with
the rest of this procedure.
2. Perform
a Resistance Test
, to determine if the Load Cell is severely damaged or a
short circuit to the frame has occurred.
Note:
The Load Cell must be completely disconnected from the Printed Circuit
Board and at
no load
when the resistance readings are taken.
Remove the Load Cell cable connector from the PC Board. Using an Ohmmeter,
measure Load Cell Resistance Readings on the cable. (See Table 2-1.) If the
resistance readings vary more than the table readings allow, replace the Load Cell.
(See Chapter 3.)
TABLE 2-1. LOAD CELL RESISTANCE READINGS (in Ohms)
MEASUREMENT POINTS
*
READING
Pins 1& 4 (Exe+ to Exe–)
Pins 2& 3 (S+ to S–)
408 ± 10
350 ± 4
*
See Figure 2-2.
Figure 2-2. Main Printed Circuit Board Connections
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2-2
Valor™ 5000 Series Service Manual
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