3165

Common Causes

• Failed motor encoder
• Damaged or loose encoder link cable/connector
• Faulty inverter unit control board
• Encoder parameter mismatch (multi-rotation range or communication basic info)

Troubleshooting Steps

1. 1Read the code number shown with the alarm: code XX=0 = Error detected during reset step of encoder link; code XX=1 = Error during network address setting; code XX=2 = Error requesting basic communication information; code XX=3 = Error during communication version change; code XX=4 = Error acquiring device information; code XX=5 = Error during parameter change; code XX=6 = Error at AT (auto) mode start; code YY=0 = Communication error; ZZZZ shows link error status C2ERR
2. 2Read the code on screen: XX shows which link sequence step failed (0=reset through 6=AT mode start) and YY shows the error type — note both before resetting.
3. 3If YY=0 (communication error) or YY=1/2/3 (transmission/reception time over), power down and inspect the encoder link cable and connectors on the named axis for bent pins, oil contamination, or a loose latch; reseat both ends.
4. 4If YY=4 or 5 (abnormal response address/code), the encoder is answering incorrectly — swap or test the encoder link cable first, then suspect the motor encoder itself.
5. 5If YY=6 (parameter error), check ZZZZ: 1=missing parameters, 2=incompatible communication basic info, 3=multi-rotation detection range mismatch — have Okuma service verify the encoder-related parameters for that axis.
6. 6If cable and connectors check out, replace the motor encoder; only after that suspect the inverter unit control board.
7. 7If the alarm returns after these checks, record the alarm number, full XXYYZZZZ code and object, and contact Okuma service.