Troubleshooting
If you´re having trouble with one of our loadpins, please proceed to have a look at the folowing trouble shooting guidlines.
Troubleshooting mA & V (I1, I4, I20, … & U1, U4, U20, …)
Testing the loadpin at the place of installation (this applies to versions without an amplifier only)
The values, which must be measured using a load pin that is in correct working order, can be found on the test certificate and/or type plate and/or in this manual, as can information about the colour coding of connecting wires and pin assignment.
Loadpin can be tested as follows:
(The values given are for a standard version load pin.)
Resistance measurement of the load pin bridge, while disconnected from the amplifier. The resistance (input resistance) must be approximately 375 ohms between the supply wires.
Between the output wires of the bridge, the resistance (output resistance), must be approximately 350 ohms.
Test the resistance between the body and the connecting wires of the loadpin. The value, which must be measured using a multimeter, must be more than 3000 MOhm.
Using the loadpin that is connected to the amplifier, when the loadpin is not loaded the mV output of the bridge must be approximately 0 mV. If this output is more than 10% of the maximum output signal, the load pin must be replaced.
Test the output at different load levels in accordance with the test certificate (see example below).
Example: sensitivity of the load pin: 2 mV/V bridge supply of the load pin: 10 V
Measured value of bridge output without load (0%) of the load cell: approximately 0 mV. measured value of bridge output at nominal load (100%): approximately 20 mV
Measured value of bridge output at 0.5 nominal load (50%): 10 mV. Values for other loads are calculated accordingly.
When ordering a load pin, always specify the type and serial number of the defective loadpin.
