FANUC Servo Amplifier Alarm Codes List
Below is a list of FANUC servo amplifier alarms and faults with a short description briefly describing the source of each error code. Some point to the source of the problem itself, others point to the problem and do not identify the failing/malfunctioning component.
Servo Amplifiers We Service
- FANUC Alpha, Alpha i series & Alpha is series
- FANUC AC Digital and Analog
- FANUC AC Serial Interface
- FANUC AC Series i & S
FANUC Servo 400 Amplifier Alarm Codes
FANUC Servo 600 Amplifier Alarm Codes
Fanuc Servo Amplifier Beta is 6130 Alarm Codes
FANUC Servo Amplifier SVPMi (6134, 6230) Alarm Codes
Tri Star CNC Services can provide you with more information on the meaning of your alarms. We will provide a fault diagnosis and a dependable 1-year warranty if you require FANUC servo amplifier repairs - or a new FANUC servo amplifier module or FANUC DC servo unit.
Alarm Code | Description |
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Amplifier is not ready |
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(a) Disconnect the feedback cable (JF*) from the Servo Amplifier, and then switch on the power. (b) Disconnect the feedback cable (JF*) from the Pulsecoder, and then switch on the power. (Keep |
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Amplifier is ready (normal operating state) |
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DC voltage of the main circuit power supply is abnormally high. Internal cooling circuit faulty Overcurrent flowed into the input of the main circuit. Input supply voltage imbalance, IGBT defective. (PSM-15 to PSM-55) The battery voltage of the absolute pulse coder is low. (warning) The main circuit power module (IPM) has detected an overload, overcurrent, or control supply voltage decrease, overcurrent, or control supply voltage decrease. Internal cooling circuit failure, Overload, Input supply voltage imbalance, IPM failure, or control supply voltage decrease of the power module. |
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Internal cooling circuit faulty. Inverter: control power supply undervoltage The battery voltage of the absolute pulse coder is low. |
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+5 VDC of the control circuit power supply is abnormally low. |
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DC voltage of the main circuit power supply is abnormally low or the circuit breaker is tripped. The motor has overheated (OHAL). The temperature of the heat sink has risen. |
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DC voltage (DC link) has dropped Regenerative discharge energy is too high. Servo motor has overheated (estimated value). |
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Average regenerative discharge energy is too high (too frequent acceleration/deceleration)
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A communication error for the serial pulse coder was detected. |
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Excessive regenerative discharge alarm. |
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Inverter: Overheat |
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Inverter: Overheat |
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MCC is faulty. Relay contacts for the dynamic brake is faulty. The DC link voltage is abnormally high. |
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Abnormal current alarm (L axis) The offset of the current detection circuit of the main circuit DC link is excessive. The regenerative discharge unit is heated. |
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Inverter: IPM alarm (L axis) |
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Abnormal current alarm (M axis) Reference position setting cannot be executed correctly. |
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Inverter: IPM alarm (M axis) |
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When the absolute pulse coder is used, the motor has not yet rotated through more than one turn after the first power–up. |
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The main circuit power supply has an open phase. |
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The DC link voltage is abnormally high. |
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An error occurred in internal parameter data transfer processing. |
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The frequency of the main circuit input power supply is abnormal. |
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The input power supply of the main circuit has an imbalance. |
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When the magnetic contactor is turned on, the phase sequence of the power supply cannot be determined. |
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A parameter has been specified incorrectly. Abnormal current alarm (N axis) External cooling circuit faulty. |
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Inverter: IPM alarm (N axis) |
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ROM is faulty. |
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RAM is faulty |
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A software is not operating normally. |
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Abnormal current alarm (L axis) Abnormally high current in the L–and M–axis motors DC link current alarm (L axis) |
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IPM alarm for L–and M–axis axes. |
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Breaker has tripped |
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An overcurrent alarm or IPM alarm DC link current alarm (M axis) |
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Faulty cooling circuit |
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Abnormal current alarm (N axis) DC link current alarm N axis) |
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Discharge alarm |
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The regenerative discharge circuit may be faulty |
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An error was detected in the RAM write/read test at power–up. The input power supply is abnormal (open phase). |
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External cooling circuit faulty |
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The temperature of the regenerative resistor has arisen abnormally. (PSMR) |
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High current flow the the main circuit of that axis has occurred |
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High current alarm L axis |
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High current alarm M axis |
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High voltage alarm |
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DC voltage of the power curcuit for that axis is high |
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The regenerative discharge unit has overheated |
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FSSB communication error |
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Low voltage alarm |
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The circuit voltage is unusually low |
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200-V control power (CX1A) is not supplied. Alternatively, the 24-VDC power is short-circuited. |
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Overheat alarm |
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Current exceeding the preset value has continued longer than normal. |
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Communication error between amplifier and module DC link low voltage alarm |
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Feedback and velocity command mismatch |
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A parameter that requires power–down has been specified. FSSB communication error
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A first to third reference position return cannot be executed because the reference position has not yet been established. |
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DC link overvoltage alarm |
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Alarm Code | Message | Description |
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n AXIS: INV. DC LINK OVER CURRENT |
DC link current is too large. |
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n AXIS: INV. RADIATOR FAN FAILURE |
The external dissipator cooling fan failed. |
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n AXIS: INV. OVERHEAT |
The servo amplifier was overheated. |
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n AXIS: INV. IPM ALARM(OH) |
The IPM (intelligent power module) detected an overheat alarm. |
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n AXIS: AMP. COMMUNICATION ERROR |
Communication between the SVM and the PSM failed. |
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n AXIS: CNV. EX. DISCHARGE POWER |
PSMR: Regenerative power is too large. |
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n AXIS: CNV. RADIATOR FAN FAILURE |
PSM: The external dissipator cooling fan failed. PSMR: The external dissipator cooling fan failed. |
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n AXIS: CNV. SINGLE PHASE FAILURE |
PSM: Input voltage is in the open–phase condition. PSMR: Input voltage is in the open–phase condition. |
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Alarm Code | Description |
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Invalid digital servo parameter setting |
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Pulsecoder phase error (built-in) |
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Soft phase alarm (built-in) |
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LED error (built-in) |
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Pulse error (built-in) |
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Count error (built-in) |
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Serial data error (built-in) |
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Data transfer error (built-in) |
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LED error (separate) |
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Pulsecoder phase error (separate) |
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Count error (separate) |
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Pulse error (separate) |
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Soft phase alarm (separate) |
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Serial data error (separate) |
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Data transfer error (separate) |
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Sensor error (separate) |
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Invalid parameter |
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Excessive semi-full error |
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Servo motor overheat |
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Converter: control power supply undervoltage |
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Converter: DC link undervoltage |
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Soft thermal (OVC) |
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Inverter: motor current alarm |
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Converter: DC link overvoltage |
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Converter: Excessive deceleration power |
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Current offset error |
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Inverter: internal cooling fan stopped or circuit failed |
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Soft disconnection alarm |
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Hard disconnection alarm (separate) |
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Feedback mismatch alarm |
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Inverter: IPM alarm |
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Soft disconnection alarm (α Pulsecoder) |
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Inverter: cooling fan stopped of the radiator |
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Inverter: IPM alarm (OH) |
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Status 1 Spindle Unit | Status 2 Spindle Unit | Description |
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Not applicable |
IPM alarm |
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Not applicable |
Excessive offset of the phase U current detection circuit |
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Not applicable |
Excessive offset of the phase V current detection circuit |
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Not applicable |
Position sensor polarity setting incorrect |
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Not applicable |
Serial transfer data error |
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Not applicable |
Position coder disconnected |
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Not applicable |
Short-period overload |
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Not applicable |
Overcurrent in the converter input circuit |
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Not applicable |
Motor lock alarm |
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Not applicable |
Serial communication LSI RAM error |
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Not applicable |
Converter: DC link precharge failure |
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Not applicable |
Parameter data out of the specifiable range |
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Not applicable |
Gear ratio parameter error |
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Not applicable |
Speed detector parameter error |
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Not applicable |
Position coder one-rotation signal detection error |
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Not applicable |
Position coder one-rotation signal not detected |
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Not applicable |
Position coder signal error |
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Not applicable |
Excessive speed command calculation value during spindle synchronization |
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Not applicable |
Converter: DC link undervoltage |
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Not applicable |
ITP signal error I |
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Not applicable |
ITP signal error II |
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Not applicable |
Current overload alarm |
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Not applicable |
Converter: main circuit overload |
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Not applicable |
Motor sensor disconnected |
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Not applicable |
CRC test alarm |
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Not applicable |
Abnormal initial test operation |
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Not applicable |
Motor sensor one-rotation signal detection error |
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Not applicable |
Motor sensor one-rotation signal not detected |
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Not applicable |
Motor sensor signal error |
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Not applicable |
Spindle sensor disconnected |
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Not applicable |
Spindle sensor one-rotation signal detection error |
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Not applicable |
Spindle sensor one-rotation signal not detected |
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Not applicable |
Spindle sensor signal error |
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Not applicable |
Communication error between amplifier and module |
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Not applicable |
Converter: control power supply low voltage |
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Not applicable |
Communication data alarm |
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- (dash) |
Input power supply is abnormal (open phase) |
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- (dash) |
DC voltage at the DC link is abnormally high |
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- (dash) |
The main circuit power module (IPM) has detected an abnormal condition. |
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- (dash) |
The main circuit capacitor was not recharged within the specified time |
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51 |
- (dash) |
In the main circuit, the DC voltage (DC link) has dropped. |
58 |
- (dash) |
Temperature of the main circuit heat sink has risen abnormally |
59 |
- (dash) |
Internal cooling circuit faulty |
b1 |
- (dash) |
Power supply voltage decrease |
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