ZW Ong

Hi Guys, Currently I'm facing issue which i got 2 pair of dual Z-Axis motor using Master & Slave, but 1 of the Slave having issue with drop down issue while it is Servo On and let it idle without moving it for minutes. (It happens randomly between 3-10 minutes, sometimes happen when Reset machine after power cycle. When I running repeating absolute MAM back and forth, this issue stop happening until I stop it again.) The fault code on Driver showing Excessive velocity error, but I already set my error tolerance to 1000 yet this issue is persist. I've run out of idea of how to verify this issue and I will be very much appreciated if there is any helpful idea could be bring up. - There are loud roaring noise in random interval on that axis motor. - I'm using the same tuning parameter as other machine. This is repeat build, the other machine is running well. - Tested separate Encoder cable from other cable (worry that there is noise) - Tested with other motor. - Tested with other driver.