company news about Main Faults and Solutions of the Electric Dynamometer System

Main Faults and Solutions of the Electric Dynamometer System

The electric dynamometer often has some common problems or faults in the process of testing. Taking our company's electric dynamometer system as an example, we will sort out the seven most common failures of electric dynamometer and its solutions.

• The dynamometer works in ABB drag mode, but it doesn’t work in load mode.

Solution: ABB torque mode is not displayed correctly, set 11.01 to the specified torque mode [REF2 (%)].

• The dynamometer started in ABB drag mode and load mode, but the variable frequency inverter system did not respond.

Solution: 1) See what error code ABB controller shows, determine the fault according to ABB instructions; 2) See whether the ABB parameters are correct, if not, need to re-identify the dynamometer.

• ABB controls two dynamometers, one can be controlled and the other cannot be controlled.

Solution: First determine whether ABB calls this parameter, or whether the parameter is not called correctly, and it depends on the code displayed on the ABB controller, if the dynamometer really does not turn up, please re-identify the dynamometer.

• After starting the dynamometer under test, then start the load dynamometer, it only start without loading, and the torque fluctuation is relatively large.

Solution: This may be caused by interference, and all instruments need to be reliably grounded; Check whether the SLFN torque sensor signal conversion cable shield is grounded.

• When calibrating SLFN torque sensor, the forward rotating is normal, and the reverse rotating is not normal.

Solution: 1) First determine whether the switching power supply 12V and -12V are normal, if not normal, the switching power supply is damaged; 2) If the torque voltage signal is not normal, the SLFN signal conversion module may be damaged, or the conversion box is damaged; 3) The sensor may be bad, it can be replaced with a new sensor and calibrated.

• During the test, the speed reading is not displayed.

Solution: 1) First check whether the encoder cable of the electric dynamometer is in good contact; 2) Check whether the encoder shield cable is grounded.

• The speed reading is not shown correctly during the test.

Solution: 1) First determine how much the actual speed of the dynamometer; 2) Whether the ratio settings for the encoder are correct; 3) Interference problems, it need to be reliably grounded; 4) The encoder may be damaged.