Er.A34 fault in inovance IS650 servo drive indicates Encoder communication check abnormal. This means servo drive model and servo motor model do not match.

1. View servo drive and servo motor nameplates to check that the equipment you are using is IS650P series servo drive and 20-bit servo motor (-U2***) of Inovance.
2. Check whether encoder cable breaks and whether connection of servo drive and connection of servo motor are secure.