0877

Common Causes

• Servo data file not compatible with the installed inverter unit
• Inverter unit not compatible with the NC software version
• Servo data wrongly changed during adjustment
• Faulty inverter unit control board

Troubleshooting Steps

1. 1Read the code number shown with the alarm: code ZZ=1 = Data value is outside its allowable setting range; code ZZ=2 = Data was set at the wrong timing; code ZZ=3 = Data was never transmitted; code ZZ=4 = Calculation error in the data; code ZZ=5 = Other data error; code ZZ=6 = Number of data IDs exceeded the limit
2. 2Note the code: XXXX is the data ID and YY the data set number of the offending data; ZZ tells the error type (1 out of range, 2 wrong timing, 3 no transmission, 4 calculation error, 5 other, 6 too many IDs).
3. 3If the alarm started right after an inverter unit swap, load the servo data file that matches that inverter unit.
4. 4If it started after servo data was adjusted or changed, restore the previous (backed-up) servo data and verify the alarm clears.
5. 5If neither applies, confirm the inverter unit is compatible with the installed NC software level.
6. 6If the error persists with correct data, suspect the inverter unit control board; record the alarm number, code and object and contact Okuma service.