FANUC SP9010 alarm 10 means the spindle amplifier has detected low input power voltage. The main checks are the amplifier input power voltage, input power cable, CXA2A-CXA2B jumper cable, DC24V output from the common power supply module, and finally the spindle amplifier.
Do not replace the spindle amplifier immediately. First confirm whether the voltage supplied to the spindle amplifier is normal and stable. If the DC24V supply is low, check the common power supply input voltage and the common power supply module before replacing the spindle amplifier.
What Does FANUC SP9010 Alarm 10 Mean?
FANUC SP9010 is an input power voltage low alarm. It means the spindle amplifier has detected a drop in the input power voltage.
In practical troubleshooting, this alarm is usually related to the spindle amplifier input power supply, power input cable, jumper cable between spindle amplifiers, common power supply module, or the spindle amplifier itself.
Main Alarm Information
| Alarm | FANUC SP9010 |
| Amplifier Alarm Number | 10 |
| Alarm Meaning | Input power voltage low |
| Main Related Area | Spindle amplifier input power, CXA2A-CXA2B jumper cable, DC24V supply, common power supply module |
Common Causes of SP9010 Alarm
- Spindle amplifier input power voltage is too low
- Input power cable is loose, damaged, or abnormal
- CXA2A-CXA2B jumper cable connection is incorrect
- CXA2A-CXA2B jumper cable is damaged
- DC24V output from the common power supply module is unstable
- Common power supply input voltage is abnormal
- Common power supply module failure
- Spindle amplifier internal power detection fault
Recommended Troubleshooting Order
- Measure the input power voltage of the spindle amplifier.
- Check the spindle amplifier input power cable and terminal connection.
- Check whether the CXA2A-CXA2B jumper cable is connected correctly.
- Inspect whether the jumper cable is damaged or has poor contact.
- Check whether the DC24V output from the common power supply module is stable.
- If DC24V is low, check the input voltage of the common power supply module.
- If the common power input is normal but DC24V is low, replace the common power supply module for testing.
- If all power supply checks are normal but SP9010 remains, check or replace the spindle amplifier.
Step 1: Check the Spindle Amplifier Input Power Voltage
First, measure the input power voltage supplied to the spindle amplifier. If the input voltage is lower than the required range, the spindle amplifier may trigger SP9010 alarm to protect the system.
Check whether the input power is stable during machine startup, spindle acceleration, cutting, and machine operation. A voltage drop may occur when the power supply capacity is insufficient or when the wiring has poor contact.
Step 2: Check the Input Power Cable
Check the power input cable connected to the spindle amplifier. A loose terminal, damaged cable, poor connection, or unstable power line may cause input voltage drop.
Confirm the following points:
- The input power cable is firmly connected.
- The cable terminals are not loose, burned, corroded, or damaged.
- The cable is not broken, crushed, or overheated.
- The power supply voltage remains stable under load.
If the input power cable is damaged or unstable, replace the cable and test the machine again.
Step 3: Check the CXA2A-CXA2B Jumper Cable
Check the jumper cable between spindle amplifiers, especially the CXA2A-CXA2B connection. Make sure the cable is connected correctly and the connector is fully inserted.
A wrong connection, loose connector, damaged jumper cable, or poor contact may cause communication or power-related detection issues and trigger SP9010 alarm.
If possible, replace the CXA2A-CXA2B jumper cable with a known good cable for testing.
Step 4: Check DC24V Output from the Common Power Supply Module
Check whether the DC24V output from the common power supply module is stable. If the DC24V voltage is too low or unstable, the spindle amplifier may detect an input power voltage problem.
If DC24V is low, continue checking the input voltage of the common power supply module.
- If the common power supply input voltage is abnormal, restore the normal input voltage first.
- If the common power supply input voltage is normal but DC24V output is still low, the common power supply module may be faulty.
In this case, replace the common power supply module for testing.
Step 5: Check the Spindle Amplifier
If the amplifier input voltage, input cable, CXA2A-CXA2B jumper cable, common power supply input, and DC24V output are all normal, the spindle amplifier should be checked.
A faulty spindle amplifier may incorrectly detect input power voltage drop or fail internally. If all external power supply checks are normal but SP9010 remains, replacing or repairing the spindle amplifier may be required.
SP9010 Diagnostic Table
| Finding | Possible Cause | Recommended Action |
| Input voltage to spindle amplifier is low | Power supply voltage drop or wiring issue | Restore normal input voltage and check power cable |
| Input power cable is loose or damaged | Poor contact or cable failure | Tighten terminals or replace the input power cable |
| CXA2A-CXA2B cable is loose or incorrect | Jumper cable connection issue | Reconnect or replace the jumper cable |
| DC24V output is low | Common power supply issue | Check common power input and DC24V output |
| Common power input is normal but DC24V is abnormal | Common power supply module fault | Replace the common power supply module for testing |
| All power supply checks are normal | Spindle amplifier internal fault | Repair or replace the spindle amplifier |
Parts Related to FANUC SP9010 Alarm
- FANUC spindle amplifier
- Spindle amplifier input power cable
- CXA2A-CXA2B jumper cable
- Common power supply module
- DC24V power supply circuit
- Power input terminals and connectors
Important Notes Before Replacing Parts
Do not replace the spindle amplifier before checking the input power voltage and DC24V supply. SP9010 may be caused by an external voltage drop, unstable common power supply module, damaged jumper cable, or poor power cable connection.
Before replacing parts, record the spindle amplifier model, common power supply module model, CNC system model, alarm screen, measured input voltage, DC24V output value, and whether the alarm appears at power-on or during machine operation.
Need Help with FANUC SP9010 Alarm?
REACO CNC provides technical support for FANUC spindle amplifier alarms, common power supply module faults, power cable checking, jumper cable replacement, spindle amplifier repair, and FANUC CNC spare parts supply. If your machine shows SP9010 alarm 10, our team can help you check whether the issue is caused by low input voltage, DC24V instability, common power supply failure, cable connection, or spindle amplifier damage.
You can contact REACO CNC and send us photos of the spindle amplifier nameplate, common power supply module nameplate, CNC system model, alarm screen, CXA2A-CXA2B cable connection, and measured voltage values. We can help confirm the likely cause and recommend suitable repair or replacement options for your FANUC spindle system.
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