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  1. Home
  2. Fault Codes
  3. Fanuc αi
  4. SP9073
SP9073Spindle alarm · Spindle amplifier (SPM)Usually repairable

Fanuc αi SP9073: Motor Sensor Disconnected

Also shown as: SPM display 73; 16i/18i/21i/0i: 9073 or 7n73

What SP9073 means

The signal from the spindle motor's built-in sensor was lost. Shown on the SPM as 73.

Symptoms

Alarm at spindle start, or intermittently at speed.

Is it repairable?

Yes: sensor replacement and adjustment are repairable.

Common causes

  • Damaged sensor cable or connector
  • Wrong sensor gap
  • Failed motor sensor
  • Coolant contamination

Safe checks

  1. 1Inspect the sensor cable and connector
  2. 2Check the sensor mounting and gap

Drives hold dangerous voltage after power-off. Checks should only be done by qualified personnel, with power isolated and the DC link discharged.

Reviewed by AutomIQ repair technicians. Code and name from the FANUC αi series Maintenance Manual.

Related Fanuc αi faults

  • SV0368Serial data error (built-in)
  • SV0401V ready off
  • SV0433DC link undervoltage
  • SV0436Soft thermal (OVC)
  • SV0438motor current alarm
  • SV0442DC link precharge failure
All 139 Fanuc αi codes

Still showing SP9073?

Fanuc amplifier showing an alarm?

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Related services: Spindle motor repair · Encoder repair

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Fault codes
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