Testing Load Cell; Electrical Test - KERN HFD Service Manual

Electronic crane scales

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10.3 Testing Load cell

For testing load cell, remove power from the system, and disconnect the PCB from the Load cell

Physical Test:

 Check the moisture, or foreign material inside.

 Check load cell surface badly rusted or corroded

 Check the strain gauge areas become compressed

 Check any physical damage (body bent or twisted) to the load cell

 Check load cell cable, all leads are connected, any cut, splits or tears.

 Check load cell for proper input and output resistances

Use an accurate multimeter to check the ohms

Load Cell Connections

Resistance

Measuring Points

Red (+ Exc) to Black ( –Exc)

Green (+Sig) to White ( –Sig)

Leakage Resistance

 Check each of the load cell wires to the load cell cable screen.

 Check each of the load cell wires to the load cell body.

These readings should be greater than 1000MΩ or OL.

If this reading is less than 1000 MΩ, then this load cell has leakage between the

internal circuit and the load cell body or cable screen

HFD-SH-e-1810

Signal

Supply

Signal

Supply

Shield

Resistance

400±10Ω

352±2Ω

Green

Red

White

Black

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