A servo drive is a controller used to control a servo motor . Its function is similar to that of a frequency converter for a regular AC motor. It is part of a servo system and is mainly used in high-precision positioning systems. Generally, it controls the servo motor through three methods: position, speed, and torque, achieving high-precision transmission system positioning. Currently, it represents a high-end product in transmission technology. The following are seven methods for servo drive repair.
1. When checking the current monitoring output of the driver with an oscilloscope, it was found to be entirely noise and could not be read.
Cause of the fault: The current monitoring output is not isolated from the AC power supply (transformer).
Solution: Use a DC voltmeter to check and observe.
2. The motor runs faster in one direction than in the other.
(1) Cause of failure: The phase of the brushless motor is wrong.
Solution: Detect or identify the correct phase.
(2) Cause of failure: The test/deviation switch is in the test position when not in use for testing.
Solution: Set the test/deviation switch to the deviation position.
(3) Cause of failure: The position of the deviation potentiometer is incorrect.
Solution: Reset.
3. Motor stall
(1) Cause of failure: The polarity of the speed feedback is incorrect.
Solution: You can try the following methods.
a. If possible, switch the position feedback polarity switch to the other position. (This is possible on some drivers.)
b. If using a tachometer, swap the TACH+ and TACH- connections on the driver.
c. If using an encoder, swap the ENCA and ENCB connections on the drive.
d. In HALL speed mode, swap HALL-1 and HALL-3 on the driver, and then swap Motor-A and Motor-B.
(2) Cause of failure: The encoder power supply is lost when the encoder speed feedback is being processed.
Troubleshooting: Check the 5V encoder power supply connection. Ensure this power supply can provide sufficient current. If using an external power supply, ensure this voltage is connected to the driver signal ground.
4. The LED light is green, but the motor is not moving.
(1) Cause of failure: Motors in one or more directions are prohibited from operating.
Solution: Check the +INHIBIT and –INHIBIT ports.
(2) Cause of the fault: The command signal is not grounded to the driver signal.
Solution: Connect the command signal ground and the driver signal ground.
5. After powering on, the driver's LED light does not illuminate.
Cause of the fault: The power supply voltage is too low, below the minimum voltage requirement.
Solution: Check and increase the power supply voltage.
6. The LED light flashes when the motor rotates.
(1) Cause of the fault: HALL phase error.
Solution: Check if the motor phase setting switch is correct.
(2) Cause of failure: HALL sensor failure.
Troubleshooting method: Detect the voltage at Hall A, Hall B, and Hall C while the motor is running. The voltage values should be between 5VDC and 0V.
7. The LED light remains red at all times.
Cause of the fault: A fault exists.
Troubleshooting: Causes: Overvoltage, undervoltage, short circuit, overheating, driver disabled, HALL invalid.
Disclaimer: This article is a reprint. If it involves copyright issues, please contact us promptly for deletion (QQ: 2737591964). We apologize for any inconvenience.
