4190

Common Causes

• Independent position encoder failure
• Encoder link cable or connector fault
• Inverter unit control board problem
• Encoder parameter mismatch (multi-turn range or communication info)

Troubleshooting Steps

1. 1Read the code number shown with the alarm: code XX = Encoder link sequence step: 0=reset, 1=net address setting, 2=basic comm info, 3=comm version change, 4=device info, 5=parameter change, 6=AT mode start.; code YY = Alarm content: 0=communication error, 1=TX start time over, 2=TX end time over, 3=RX end time over, 4=wrong response address, 5=wrong response code, 6=parameter error.; code ZZZZ = Data: C2ERR status, transmitted/received frame info, responding net address, or parameter number depending on YY.
2. 2Read the code: XX is the link sequence step (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); YY is the alarm content (0 communication error, 1-3 time overs, 4 wrong response address, 5 wrong response code, 6 parameter error).
3. 3If YY is 6, read ZZZZ: 1 means insufficient parameters received, 2 means basic communication info incompatible, 3 means multi-turn detection range over, pointing to a parameter or encoder-type mismatch rather than dead hardware.
4. 4Inspect the encoder link cables and connectors between the independent position encoder and the inverter unit for damage, oil or bent pins and reseat both ends.
5. 5Swap the encoder link cable with a known-good cable, then cycle power and watch whether initialization passes the step shown in XX.
6. 6If wiring is good, substitute the independent position encoder; if still failing, have the inverter unit control board checked, then re-establish the axis reference.