FANUC SP9089 Alarm 89: Submodule SM (SSM) Error and Troubleshooting

FANUC SP9089 means that the spindle amplifier detected an abnormality involving the submodule SM, also identified as the SSM, used with a BiS Series synchronous spindle motor. The CNC displays SP9089, while the spindle amplifier displays alarm 89.

FANUC Maintenance Manual B-65285EN/04 identifies four main possibilities: an incompatible spindle amplifier, an SSM that is not installed or connected, a disconnected JYA4–CX31 interface cable, or a faulty SSM.

What Does FANUC SP9089 Mean?

Alarm 89 is associated with the SM auxiliary module or SSM submodule used to drive a BiS Series synchronous spindle motor.

The alarm does not automatically mean that the spindle motor itself has failed. It indicates that the spindle amplifier cannot correctly confirm the required SSM configuration or communication path.

Possible causes identified by FANUC include:

• The installed spindle amplifier does not support the SSM

• The SSM is not installed or is not connected

• The interface cable between JYA4 and CX31 is disconnected

• The JYA4–CX31 interface cable is damaged

• The SSM is faulty

The time at which the alarm first appears helps determine which causes should be checked first.

Alarm Appears During Initial Installation or Startup

If SP9089 appears when the machine is first commissioned, after a spindle amplifier replacement, or after the spindle system has been rewired, check all four possible causes:

1. Spindle amplifier compatibility

2. SSM installation and connection

3. JYA4–CX31 interface cable continuity

4. SSM condition

An incompatible replacement spindle amplifier can produce alarm 89 even when the cable and SSM are functioning correctly.

Alarm Appears After the Machine Previously Operated Normally

If the machine previously operated normally with the same spindle amplifier and SSM configuration, FANUC indicates that the more likely causes are:

• The interface signal cable has become disconnected or damaged

• The SSM has developed a fault

In this situation, inspect the JYA4–CX31 connection and the SSM before replacing the spindle amplifier.

SP9089 SSM Connection Reference

The SSM configuration includes an interface connection between:

• JYA4 on the spindle amplifier

• CX31 on the SSM

• The associated control cable

• The applicable power wiring

• The BiS Series synchronous spindle motor

SSM connection reference for a BiS synchronous spindle system, including JYA4, CX31, the control cable, and power wiring.

The illustration is a configuration reference. Always confirm connector assignments, cable specifications, and wiring against the manuals for the exact spindle amplifier, SSM, motor, and machine.

1. Confirm SP9089 and Amplifier Alarm 89

Before replacing any component, confirm both alarm displays:

• The CNC alarm screen shows SP9089

• The spindle amplifier status display shows 89

• The machine uses a BiS Series synchronous spindle motor

• An SM or SSM submodule is installed in the spindle system

Record the alarm screen before switching off the machine. Also record:

• Complete CNC series and model

• Full spindle amplifier model and suffix

• SSM model and specification

• Synchronous spindle motor model

• Whether the alarm appeared during startup or normal operation

• Whether the spindle amplifier, SSM, or wiring was recently replaced

These details are necessary for checking compatibility and selecting the correct replacement hardware.

2. Confirm That the Spindle Amplifier Supports the SSM

FANUC lists an unsupported spindle amplifier as a possible cause when alarm 89 appears during initial startup or after hardware replacement.

Compare the complete spindle amplifier specification with:

• The installed SSM

• The BiS synchronous spindle motor

• The CNC and spindle software

• The machine builder’s original spindle configuration

Do not determine compatibility only from the amplifier’s physical appearance, output capacity, or base model number. The complete FANUC part number and all suffixes must be checked.

If the installed spindle amplifier does not support the required SSM configuration, replace it with the correct compatible spindle amplifier.

If a replacement is required, browse FANUC servo, spindle, and power drives or send the complete model numbers to REACO CNC for a compatibility check.

3. Confirm That the SSM Is Installed and Connected

Check whether the SSM is physically installed and correctly connected.

Inspect:

• The SSM mounting condition

• The CX31 connector on the SSM

• The JYA4 connector on the spindle amplifier

• Connector locking and retention

• Bent, recessed, contaminated, or damaged connector pins

• Evidence that wiring was left disconnected after maintenance

Disconnecting and reconnecting the cable should only be performed with machine power isolated and according to the applicable electrical-safety procedure.

Do not bypass the SSM or modify the wiring to suppress the alarm.

4. Inspect the JYA4–CX31 Interface Cable

The principal signal connection for this alarm is the interface cable between:

• JYA4 on the spindle amplifier

• CX31 on the SSM

Check the cable for:

• Loose connections

• Damaged connector housings

• Bent or recessed pins

• Broken conductors

• Abrasion, crushing, or cutting

• Oil or coolant contamination

• Incorrect cable routing

• Previous repairs or nonstandard splices

If the machine wiring diagram identifies this control cable as K86, confirm that the correct K86 cable is connected between JYA4 and CX31.

Do not rely only on an external visual inspection. A cable may have an internal intermittent break even when the insulation appears undamaged. Test the cable according to the applicable FANUC and machine builder procedures or substitute a confirmed compatible cable.

5. Check or Replace the SSM

If the spindle amplifier supports the SSM and the JYA4–CX31 interface cable is correctly connected, the SSM may be faulty.

Before replacement, record:

• Complete SSM model number

• Connector arrangement

• Related spindle amplifier model

• Motor model

• Existing wiring configuration

Replace the SSM only with an exact compatible module. Do not select a replacement solely by appearance or connector layout.

After replacement, verify all control, power, and grounding connections before restoring machine power.

6. Check the Spindle Amplifier

The spindle amplifier must be replaced when its specification does not support the required SSM configuration.

If compatibility is correct but SP9089 remains after the JYA4–CX31 cable and SSM have been verified, the spindle amplifier should be professionally tested according to the applicable FANUC and machine builder procedures.

Before installing another spindle amplifier, verify:

• Full FANUC part number and suffix

• Hardware series

• Spindle software compatibility

• SSM support

• BiS motor compatibility

• Connector and wiring requirements

Replacement must be performed with machine power isolated by qualified personnel. Follow the specified capacitor discharge time and electrical-safety instructions.

7. Retest the Spindle System

After completing the repair, power up the machine according to the applicable procedure and confirm:

• SP9089 no longer appears

• The spindle amplifier no longer displays alarm 89

• The SSM is recognized correctly

• No additional spindle alarm is displayed

• The synchronous spindle motor operates normally

• Required spindle orientation and synchronization checks are completed

If a different alarm appears, diagnose the new alarm number separately.

Do Not Confuse SP9089 With a Sensor Alarm

SP9089 concerns the SSM submodule system. It is different from spindle sensor and feedback alarms such as:

Do not replace the spindle sensor, adjust the sensor gap, or change encoder parameters solely because SP9089 is displayed. Those procedures apply to different alarm numbers.

Difference Between Alarm 88, Alarm 89, and Alarm 90

Always follow the procedure for the exact alarm number shown on the spindle amplifier.

FANUC SP9089 Diagnostic Table

Recommended Troubleshooting Order

1. Confirm SP9089 on the CNC and alarm 89 on the spindle amplifier.

2. Record the complete spindle amplifier, SSM, motor, and CNC specifications.

3. Determine whether the alarm appeared during initial startup or after normal operation.

4. Confirm that the spindle amplifier supports the installed SSM.

5. Confirm that the SSM is installed and connected.

6. Inspect the JYA4–CX31 interface cable and connectors.

7. Replace a damaged or disconnected interface cable.

8. Test or replace the SSM if the wiring is correct.

9. Test or replace the spindle amplifier if it is incompatible or confirmed faulty.

10. Retest the complete spindle system.

Technical References

• FANUC AC Servo Motor αis/αi Series, AC Spindle Motor αi Series, Servo Amplifier αi Series Maintenance Manual, B-65285EN/04, Alarm Code 89

• FANUC Servo Motor αi-B Series Maintenance Manual, B-65515EN series, SP Alarm 89

• Applicable FANUC connection and maintenance documentation for the exact spindle amplifier, SSM, BiS synchronous spindle motor, CNC, and machine

Always use the manual edition that applies to the exact installed equipment and software.

Need Help With FANUC SP9089 Alarm?

REACO CNC provides independent testing, repair, compatibility checking, and replacement support for FANUC spindle amplifiers and related modules.

For technical assistance, send us:

• CNC alarm-screen photo

• Spindle amplifier display photo

• Complete spindle amplifier model and suffix

• SSM model

• BiS spindle motor model

• Photos of the JYA4 and CX31 connections

• Details of when the alarm appears

• Information about any recently replaced components

Visit the FANUC Technical Support Center for more FANUC alarm guides, or contact REACO CNC for assistance.

Reference Source: Beijing FANUC. This article is based on FANUC technical documentation. The applicable diagnosis, replacement, and verification procedures depend on the exact spindle amplifier, SSM, motor, CNC, software, wiring configuration, and machine.