Environment and parameter check

1. To confirm if the power supply works fine.

2. To confirm if the data on the LED screen is transferred to the system.

3. To confirm if the Iout function is still on. (Parameter E06)

4. To confirm if the low point value is 0 or 4mA. (Parameter E13)

5. To confirm the setting of the corresponding value range. (Parameter E07 E08)

6. To confirm if wire wiring is correct and the insulation of unused wires is finished.

Hardware, wiring, and program of the receiver check

1. To get into parameter E11 to check if the 4/0mA export and interpretation function of the receiver (If there is a difference between data to data, users could adjust it by the unit uA at this page) works fine.

2. To get into parameter E12 to check if the 20mA export and interpretation function of the receiver works fine. (If there is a difference between data to data, users could adjust it by the unit uA at this page.)

3. To confirm if the interpretation function of the receiver works fine under simulation mode when testing different data. Simulation mode must be switched off when testing is finished. (Users can switch on the simulation mode by parameter F02 too, and adjust the simulated data by parameter F01. Back to the main page while finishing data adjustment.)

4. If the wiring during the above test is different from the actual operation, please re-test.

Exporting of the device check

1. Separating the Iout wiring from the system, then using the multimeter MA stalls to confirm if the current export works fine.

Results and actions

1. If the data is still abnormal when both the Iout export function and the equipment and program of receiver work fine, some other possible reason, like pipe size, or paddle wheel abnormal, should be checked further.

2. The current device may be damaged possibly. If users have another device for cross test, please make sure receiving equipment, data processing program, or wiring work fine.

3. Contact the original manufacturer with the serial number, wiring diagram (all related wiring of the flowmeter), and the model and brand of receiver.

4. Make sure if receiving equipment, data processing program, or wiring work fine.

Environment and Parameter Check

1. Confirm that the device power supply is normal.

2. Confirm whether the confirmation page data is consistent with the communication data.

3. Confirm that the RS485 function is enabled, the ID and Baud are defined correctly (parameters E04 E05).

4. All unused wires are insulated, and there is no magnetic field interference in the surrounding area.

Hardware, Wiring, and Program of the Receiver Check

1. Confirm whether the RS485 command is used correctly.

2. Only one flowmeter is connected to the line, whether it can communicate normally.

3. Make sure the RS485 wiring is using the series connection method and not the star connection method.

4. In the case of multiple devices, is there any phenomenon that the power supply and ground wire of some devices are different, resulting in ground looping and potential fluctuation?

5. Does the line meet the requirements for twisted wire, thickness, series connection, and short fork?

6. For longer lines, do you use terminating resistors at both ends of the circuit?

7. For scenarios with large external interference, is a bias circuit used?

8. If there are multiple devices on the line, have you confirmed that the Baud of each device is the same and the ID is different?

9. Use an oscilloscope to see if the noise between the RS485 +/- lines is too high? (>200 mVpp generally considered too large)

Results and Actions

1. The RS485 output is normal, and the receiver equipment and programs are also normal. If the data is still abnormal, confirm other abnormal causes (pipe size, paddle wheel).

2. The main unit of this device may be damaged. If you have other units at hand, you can conduct a cross test to confirm that the receiving device, data processing program or line are all normal.

3. Please contact the original factory after recording the serial number of the fuselage, the wiring diagram (all flowmeter-related wiring) and the model brand of the receiving end.

4. If the line or environment cannot be improved, please allow the program to allow more re-communication attempts.

Trouble shooting

Abnormality shooting