3190

Common Causes

• Failed independent position encoder
• Damaged encoder link cable or loose connector between encoder and inverter
• Faulty inverter unit control board
• Incompatible or corrupted encoder parameter/communication data (parameter error codes)

Troubleshooting Steps

1. 1Read the code number shown with the alarm: code XX=0 = Failure during reset step; code XX=1 = Failure during net address setting; code XX=2 = Failure requesting basic communication information; code XX=3 = Failure during communication software version change; code XX=4 = Failure acquiring device information; code XX=5 = Failure during parameter change; code XX=6 = Failure at AT mode start; code YY=0 = Communication error; ZZZZ is the encoder link error status
2. 2Read the code: XX is the initialization step where it failed (0 reset, 1 net address setting, 2 basic communication info request, 3 communication version change, 4 device info acquisition, 5 parameter change, 6 AT mode start) and YY is the error type (0 communication error, 1-3 transmission/reception time over, 4 wrong response address, 5 wrong response code, 6 parameter error).
3. 3If YY=6, use ZZZZ to identify the parameter problem (1 too few parameters received, 2 incompatible basic communication info, 3 multi-turn detection range over) and have the encoder parameter data verified/corrected.
4. 4Lock out power and allow the drive to discharge; then reseat the encoder link connectors at the independent encoder and the inverter unit and inspect the cable for damage or coolant ingress.
5. 5If YY=0-3 (communication or timeout), suspect the link path first: swap the encoder link cable with a known-good one before condemning hardware.
6. 6If the link is good, substitute the independent position encoder; the inverter unit control board is the last suspect. If it persists, record the full code and object and contact Okuma service.