Siemens 828D system alarm 231802 fault maintenance and handling

Siemens 828D system alarm 231802 fault maintenance and handlingTroubleshooting method for Siemens 828D CNC system alarm 26106

The following is the standardized troubleshooting process for Siemens 828D CNC system alarm 26106 ("Axis encoder not found/Active encoder hardware error"), combined with hardware testing and Siemens S120 driver alarm F30885 (cyclic data transmission failure), the following structured process can be followed to troubleshoot step by step

1、 Emergency handling and basic inspection

Power off and restart verification

If the alarm disappears after restarting, focus on checking for loose physical connections or transient interference:

Check if the plugs at both ends of the encoder cable (motor end/control cabinet side) are loose, unplug and plug again, and confirm that the locking device is in place.

Observe whether the status indicator light of the DRIVE CLiQ interface module (such as SMC20) flashes abnormally.

Temporary parameter avoidance

Enter "Diagnosis → Machine Data" and change the affected axis to semi closed loop mode (shielded grating ruler):

Modify axis parameter MD30200=1 (using only motor encoder feedback).

If the alarm disappears, the fault can be locked in the grating ruler or the second measurement system.

2、 Hardware troubleshooting

Cable and connection detection

Wire breakage test: Use a multimeter to measure the continuity of the encoder cable (with a focus on checking pins A+/A -, B+/B -, and the zero pulse line). If the resistance is abnormal (>5 Ω), the cable needs to be replaced.

Shielding layer inspection: Confirm that the two ends of the cable shielding layer are firmly grounded (torque ≥ 0.8N · m) to avoid signal interference.

Encoder body diagnosis

Static test: Disconnect the cable, supply 5V DC power to the encoder, manually rotate the shaft and use an oscilloscope to detect the waveform:

Normal: A/B phase signal phase difference of 90 °, zero pulse narrow peak.

Abnormal (waveform disorder/no output): The encoder is damaged and needs to be replaced.

Dynamic inspection: During operation, the encoder produces abnormal noise and severe vibration, which can easily cause the internal encoder disc to break (commonly seen in working conditions with excessive feed rate).

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