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7.5. Verifying The Load cell Connections Using Multimeter

The load cell connection can be checked easily using a digital multimeter.

Illustration 12 Connection Check of Load Cell shows points to confirm the load cell connection.

When a summing box is used, the same measurement must be performed, even internally.

Illustration 12 Connection Check of Load Cell

7.5.1. Check List Of The Load cell Connections

Measurement

Point

Item To Be Measured Judging The Voltage

EXC+ SEN+

A drop voltage of the load

cell cable on EXC+ side.

Normally 100mV or less. However, it may exceed 1V

when an extremely long load cell cable is used. For the

4-wire connection, it must be 0V.

EXC+ EXC- Input voltage of load cell Normal range is between 4.75 V to 5.25 V.

SEN- EXC-

A drop voltage of the load

cell cable on EXC- side.

Normally 100mV or less. However, it may exceed 1V

when an extremely long load cell cable is used. For the

4-wire connection, it must be 0V.

SIG- EXC- Center point voltage Approximately 2.5 V of a half of excitation voltage.

SIG+ SIG- Output voltage of load cell

Generally within 0 V to 15mV. Theoretical value is

calculated from the load cell rated capacity, actual load

and excitation voltage.

utput voltage of load cell

Center point voltage

Drop voltage between

EXC- and SEN-.

Input voltage of load cell

Drop voltage between

EXC+ and SEN+.

Load cell

Shield cable

SIG-

EXC-

SEN-

SIG

SEN

EXC

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