AC servo driver alarms Err13 means it is overloaded.
1- One of the U, V or W open circuit.
2- AC servo driver is not matched with the AC servo motor.
3- The torque of the AC servo motor is not big enough.
4- AC servo driver is broken.
1- Check the cables.
2- No.1 parameter of the AC servo driver is match with the AC servo driver or not? If not please set it right then recovery the default parameters.
3- Check machine load, is it too heavy?
4- Reduce the start and stop frequency, or increase the acceleration-deceleration time constant.
5- Replace a bigger AC servo motor & driver.
6- Send back the AC servo driver to repair.