Our technical engineers have found that when a product malfunctions, many users tend to perform self-diagnosis first, and only seek external assistance if they cannot resolve the issue.
In response to users' self-testing needs, this issue of "Study Classroom" has compiled the "General Troubleshooting Process" into a document, applicable to AS/ES series pulse type and bus type servo drives.
Hope this helps!
01 Self-check for wiring correctness
Investigation methods:
■ Are the UVW phase sequence correct? Do the UVW of the motor power lines correspond one-to-one with the UVW of the driver terminals?
■ Is the encoder cable a standard cable? Or is it custom-made by the user? If it is not a standard cable, we recommend checking whether the cable soldering is secure and whether it is soldered incorrectly.
■ Does the entire system's PE line share a common ground?
■ Is the wiring at CN1 terminal loose?
02 Parameter setting issues
Investigation methods:
■ If other machines of the same model are working normally, upload the parameters of the normally functioning drive, download and save it to the current drive, and test if it works normally.
■ After setting P11.09=1, power off and wait for the driver screen to completely lose power before powering on and restarting to restore factory settings.
■ After setting the alarm parameters, restore the driver to factory settings and determine if the alarm has been cleared.
03. Driver/motor/cable malfunction, and its ownership cannot be determined.
Investigation methods:
■ Replace the current driver/motor/cable with a working driver/motor/cable, perform cross-validation, and then determine the fault location.
04. After inputting the command, the motor does not rotate.
Investigation methods:
■ Monitor the P18.15 input command pulse counter to determine if the driver is receiving command pulses normally. Check parameter settings and wiring.
■ Is it enabled? Is the motor shaft locked? Check if the enable signal wiring and operation are normal.
■ Check if the parameters for P00.00 control mode, P04.00 position command source, and P04.21 pulse command form are set correctly.
■ Check if the pulse input port wiring is correct.
■ Check if the electronic gear ratio setting is correct?
05 Inaccurate positioning
Basis: Feedback pulse accumulation value × 1 position command corresponding to load displacement = Mechanical stopping position
Investigation methods:
■ Position commands are interfered with; noise interference causes pulse position commands to be lost.
Judgment method: Input position command counter × electronic gear ratio = feedback pulse accumulation value
Inspection details: The pulse input terminal uses a double-hinged shielded cable.
When the high-voltage and pulse input terminals are wired separately, and a low-speed pulse input terminal is selected, the filtering time constant of the low-speed pulse input pin should be increased (P09.12). When a high-speed pulse input terminal is selected, the filtering time constant of the high-speed pulse input pin should be increased (P09.11).
■ Signal interference causes encoder feedback position errors; adding a magnetic ring improves anti-interference performance.
Judgment method: Input position command counter × electronic gear ratio = feedback pulse accumulation value
■ If slippage occurs between the machine and motor shafts, check if the couplings and other connecting parts are securely tightened.
06 Unable to connect to debugging software
Investigation methods:
■ Is the COM driver working properly? Select the correct COM port according to the Device Manager display.
■ Is the COM port being used by other software? If so, close the other software using the COM port.
■ Are the communication address (P10.10), baud rate (P10.05), and communication format correct (P10.13)?
■ Is the test cable faulty? If so, replace the test cable. The test cable model is: T1-AS2-1A5.
07 Parameter settings/download failed
Investigation methods:
■ Unable to modify parameters via keyboard: Parameters cannot be modified when the driver is enabled. You can modify the parameters after disabling the driver.
■ Unable to modify parameters via software: Parameters cannot be modified when the driver is enabled. You can modify the parameters after disabling the driver.
■ After setting P11.09=1, power off the device. Once the driver screen is completely powered off, power on and restart the device to restore factory settings. After restoring factory settings, you can then modify the parameters.
08 Power-on trip
Investigation methods:
■ When selecting a circuit breaker, choose one with a larger rated current if the rated current is too small.
■ The input power cord is short-circuited or the motor UVW is short-circuited. Check the wiring and whether the motor UVW is short-circuited.
09 DI/DO digital input/output signal, malfunctioning
Investigation methods:
■ There may be an abnormality in the input/output wiring. Check the DI/DO wiring.
■ If the signal is interfered with, the signal line and the power line should be wired separately and not placed too close to the power line.
■ When using an external power supply, check if the power supply voltage is too low. It is recommended to use the driver's internal 24V power supply.
■ The input/output port optocoupler is damaged. Replace with a new driver and test.
10. The brake cannot be released.
Investigation methods:
■ Check DO output wiring
■ Check page 18.23 to determine the working status of the DO output function.
■ Check if the motor brake power supply voltage is 24V
Click the image below to view "AS/ES Series Servo Alarm Code Analysis".
