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| | Home > FAQ > Question #33 |
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| How to check a load pin with output 4..20 mA (3 wires) ? | Go back to the FAQ | |
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| 1. Put power off.
2. Disconnect the load-pin from the electronic control unit.
3. Put power on.
4. Measure the voltage of the supply that your electronic control unit delivers to the load-pin. On the drawing in enclosure, it is between the terminals called "Common" (-) and "24 VDC" (+). This has to be comprised between 15 and 30 VDC.
5. Put power off.
6. Connect the load pin to the electronic control unit and a multimeter configured for mA measurement following the drawing in enclosure. Be sure that the yellow wire is connected to the "Common" terminal.
7. Put power on.
8. The measured current has to be near 4 mA without load and has to increase to 20 mA with full load (2 ton or 50 ton in your case).
9. If the measured current is about 0 mA, put power off, disconnect the load-pin and measure the input impedance of the electronic control unit. This has to be smaller or equal than 250 Ohms. |
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| | Sensors customizations |
| | This page will help you to define your custom-made load pins. |
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