Er.942 fault in inovance IS650 servo drive indicates Parameter storage too frequent. This means a great number of parameters are modified and stored frequently to EEPROM (H0C-13 = 1).

1. Check whether host controller performs frequent and fast parameter modification on servo drive.
2. Check the running mode. For the parameters that need not be stored in EEPROM, set H0C-13 to 0 before writing operation of host controller.