Tri Star CNC Services helps you diagnose and troubleshoot your FANUC spindle amplifier and other electronic components. If your CNC machine tool is throwing an error you need to track down the source of the problem—which isn’t always as easy as it sounds.

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FANUC Parts We Service:

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FANUC Alpha, Alpha i series & Alpha is series
FANUC AC Digital and Analog
FANUC AC Serial Interface
FANUC AC Series i & S

If you’ve tried everything, scoured every alarm code list you can find and still can’t get your part back in production, contact us today. You’ll get free over-the-phone support , and, if necessary, a quote for FANUC spindle repairs, a new FANUC spindle amp module or FANUC AC spindle amp.

Fanuc Spindle Amplifier Alarms
Alarm Code	Description
Unit is not ready or not commanded to run.
Amplifier is ready (normal operating state)
SPM control program is not operating.
Error was detected in SPM control program processing.
Error was detected in the clock of the SPM control PCB.
Parity error was detected in the SRAM on the SPM control PCB
Spindle motor over temp
Actual motor speed is largely deviated from the commanded speed.
DC link fuse has blown Faulty regen circuit or DC link circuit is faulty
Detected that the 3-phase input to the main circuit of the PSM has an open phase. Detected that the 3-phase input has an open phase.
AF2 or AF3 fuse blown. Control power supply fuse blown.
Overspeed (Analog) The temperature sensor is abnormal in the motor, or the temperature sensor cable is broken.
The motor rotates at a speed exceeding 115% (standard setting) of the maximum allowable speed. Overspeed (Digital)
+24V overvoltage. High input voltage.
Temperature of the heat sink of the SPM main circuit has risen to the set value. Heat sink is overheated.
Input power voltage dropped.
PSM detected that the DC link voltage was excessively high. DC link overvoltage. DC link voltage was excessively high.
Excessively large current flowed into the DC link of the main circuit.
Memory inside the CPU is faulty.
ROM alarm
Spindle switching operation sequence was not executed correctly. Option alarm, possible spindle switch/output switch sequence faulty. Spindle switch/output switch sequence faulty.
The memory (RAM) is faulty. RAM in NOVRAM alarm
NVRAM is faulty.
ROM sum check alarm ROM is defective Program sum check error
The offset voltage of the phase U current detection circuit is excessively high.
The offset voltage of the phase V current detection circuit is excessively high.
VCMD offset alarm Position sensor polarity setting incorrect
TSA offset alarm
ER offset alarm
The power to the CNC is turned off. (This symptom does not represent an error.) Serial communication data transferred between the CNC and spindle amplifier module contains an error.
Serial communication between the CNC and spindle amplifier module stopped. Serial transfer data error
The sensor signal (for speed control) for Cs contour control has an error.
The sensor signal (position coder signal) for position control is abnormal.
The sensor signal (for position control) for Cs contour control is abnormal.
An excessive load (standard setting: load meter reading of 9 V) has been applied continuously for a certain period (standard setting: 30 seconds).
An excessively large current is detected at the input of the 3-phase main circuit of the PSM. Defective power regeneration circuit.
The motor failed to rotate as specified, and has stopped or is rotating at a very low speed.
LSI memory for serial communication is abnormal. A check is made when the power is turned on.
The PSM could not be charged within a specified time. PSM input has an open phase. DC link circuit problem.
Parameter data outside the specifiable range was set. Incorrect parameter setting.
The gear ratio set in a parameter exceeds the value range allowable for internal processing. This alarm is issued with a parameter related to orientation of magnetic sensor type. The gear ratio set in a parameter exceeds the value range allowable for internal processing.
Error counter overflowed. Error counter over flow
After emergency stop signal input, the motor is accelerated without being decelerated. This alarm is issued also when the motor is not deactivated (the motor is not decelerated completely) when the acceleration/deceleration time (initial parameter setting: 10 seconds) has elapsed after emergency stop signal input. Incorrect parameter setting for the number of speed feedback pulses.
The position where the one-rotation signal for Cs contour control is generated is incorrect. This alarm is not issued when the parameter indicated below is not set. Incorrect data ROM type for Cs contour control detector circuit or incorrect setting.
The one-rotation signal for Cs contour control is not generated.
The position where the one-rotation signal of the α position coder, BZ sensor, MZ sensor, α position coder S is incorrect. Incorrect setting of parameter of number of position coder signal pulses.
The one-rotation signal of the α position coder, BZ sensor, MZ sensor, α position coder S is not generated. Alarm for indicating position coder 1 -rotation signal not detected
The position coder signal of the spindle on the mater side used in the differential speed mode is disconnected. Alarm for indicating disconnection of position coder signal for differential speed mode
An error occurred in the A/D converter.
The one-rotation signal of the position coder cannot be detected normally during thread cutting. Alarm for indicating failure in detecting position coder 1 -rotation signal in thread cutting operation
The count value of α position coder signal pulses is abnormal. The pulse count value of the MZ sensor or BZ sensor is abnormal. Incorrect setting of parameter for number of position coder signal pulses.
Position coder 1 -rotation signal abnormality
In the differential speed mode, the spindle speed on the master side (remote) converted to a motor speed on the slave side (local) exceeded the maximum allowable speed of the motor. Excessive speed command calculation value in spindle synchronization control
A value obtained by internal calculation in spindle synchronization exceeded the allowable range. Excessive speed command calculation value in spindle synchronization control
The PSM detected that the DC link voltage was excessively low. Undervoltage at DC link section
The synchronization signal (ITP) in communication data transferred to and from the CNC stopped. ITP signal abnormality I

FANUC Parts We Service:

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Fanuc Spindle Amplifier Alarms