Omron G5 Series Servo Drive

Omron G5 Series Servo Drive Fault Codes:

Fault Code and MeaningCause and Remedy
Alarm 11

Power supply undervoltage
Cause:

The power supply voltage is low, momentary interruption occurred, capacity is insufficient, or main power is OFF/not input.

(Phase loss) The phases (L1, L2, L3) are not connected correctly.

The main circuit power supply is damaged or Control PCB error.



Remedy:

  • Increase the power supply capacity.

  • Change the power supply.

  • Turn ON the power supply.

  • Connect the phases (L1, L2, L3) correctly (or L1 and L3 for single-phase).

  • Replace the Servo Drive.
Alarm 12

Overvoltage
Cause:

(At Power ON) Main circuit power supply voltage is out of allowable range.

(During Deceleration) Load inertia is too large or voltage out of allowable range.

(Vertical Axis) Gravitational torque is too large.



Remedy:

  • Change the main circuit power supply voltage to within allowable range.

  • Calculate regenerative energy and connect an External Regeneration Resistor with required capacity.

  • Extend the deceleration time.

  • Add a counterbalance to lower gravitational torque.

  • Reduce descent speed.
Alarm 13

Main circuit power supply undervoltage
Cause:

(At Power ON) Power supply voltage low, momentary interruption, capacity insufficient, or main power OFF.

Phase loss occurred.

Main circuit power supply or Control PCB is damaged.



Remedy:

  • Check power supply capacity.

  • Change the power supply.

  • Turn ON the power supply.

  • Extend the Momentary Hold Time (Pn509).

  • Correctly connect the phases of the power supply voltage.

  • Replace the Servo Drive.
Alarm 14

Overcurrent
Cause:

Control PCB error.

Motor power line short-circuited or ground-faulted.

Phase U, V, W and ground wired incorrectly.

Motor winding burned out.

Dynamic brake relay deposited.

Motor non-conformity.

Pulse input timing too early.

Resistor in Servo Drive overheating.



Remedy:

  • Replace the Servo Drive.

  • Repair short-circuited/ground-faulted power line.

  • Measure insulation resistance; replace motor if shorted.

  • Wire correctly.

  • Do not frequently input RUN command or operate system by turning servo ON/OFF.

  • Use a Servomotor appropriate for the Servo Drive.

  • Wait at least 100 ms before inputting pulses after turning ON operation command.

  • Reduce ambient temperature to 55°C or lower.
Alarm 15

Servo Drive overheat
Cause:

The ambient temperature is too high.

The load is too large.



Remedy:

  • Lower the ambient temperature.

  • Increase the capacity of the driver and motor.

  • Reduce the load.

  • Extend the acceleration/deceleration times.
Alarm 16

Overload
Cause:

(At Servo ON) Motor wiring error, Electromagnetic brake is ON, or Drive is faulty.

(During Operation) Effective torque exceeds rated torque, or initial torque exceeds maximum.

Unusual noise/vibration caused by faulty gain adjustment.



Remedy:

  • Wire the motor power cable correctly.

  • Turn OFF the brake.

  • Replace the Servo Drive.

  • Review load conditions, operating conditions, and motor capacity.

  • Adjust the gain correctly.
Alarm 18

Regeneration overload
Cause:

Load inertia is too large.

Deceleration time is too short or motor rotation speed too high.

Operating limit of External Regeneration Resistor limited to 10% duty.

(Vertical Axis) Gravitational torque is too large.



Remedy:

  • Calculate regenerative energy and connect External Regeneration Resistor with required capacity.

  • Extend the deceleration time.

  • Reduce the motor rotation speed.

  • Set Regeneration Resistor Selection (Pn016) to 2.

  • Add a counterbalance to lower gravitational torque.
Alarm 21

Encoder communications error
Cause:

Encoder is disconnected or connector contacts are faulty.

Encoder is wired incorrectly.

Encoder is damaged.

Drive is faulty.

Motor shaft is mechanically held.



Remedy:

  • Fix disconnected locations and wire correctly.

  • Replace the motor.

  • Replace the Servo Drive.

  • If the motor shaft is held, release it.
Alarm 23

Encoder communications data error
Cause:

Encoder signal line is wired incorrectly.

Noise on the encoder wiring.

Encoder power supply voltage has dropped (esp. long cables).



Remedy:

  • Wire correctly.

  • Take measures against noise on the encoder wiring.

  • Provide the required encoder power supply voltage (5 VDC ± 5%).
Alarm 24

Error counter overflow
Cause:

Wiring incorrect (Power or Encoder).

Motor mechanically held or Brake not released.

Gain adjustment insufficient.

Acceleration/deceleration too rapid.

Load too large.

Error Counter Overflow Level (Pn014) exceeded.



Remedy:

  • Wire correctly.

  • Release motor shaft or electromagnetic brake.

  • Replace the Servo Drive (if Control PCB error).

  • Adjust the gain.

  • Extend acceleration/deceleration times.

  • Reduce the load or select a suitable motor.

  • Increase the set value of Pn014.

  • Reduce rotation speed.
Alarm 25

Excessive hybrid deviation error
Cause:

Occurs during full closing control. There is deviation between the load position (external encoder) and motor position (encoder).



Remedy:

  • Check the motor and load connection.

  • Check the external encoder and drive connection.

  • Check the external encoder load position and encoder motor position settings.
Alarm 26

Overspeed
Cause:

Speed command input is too large.

Electronic Gear Ratio Numerator (Pn009) not appropriate.

Speed exceeds maximum due to overshooting.

Encoder wired incorrectly.

Overspeed Detection Level (Pn513) exceeded during torque limit switching.



Remedy:

  • Give a speed command of 500 Kpps or lower.

  • Set electronic gear ratio to give speed command of 500 Kpps or lower.

  • Adjust the gain.

  • Wire encoder correctly.

  • Set motor operating speed range correctly on Error Counter Overflow Level (Pn014).
Alarm 27

Command pulse error
Cause:

Multi-turn counter of absolute encoder cleared by CX-Drive.

MECHATROLINK-II communication established during trial.

Speed command exceeds limit.

Position command variation too large.

Electronic Gear Ratio Numerator (Pn009) not appropriate.

Backlash compensation amount too large.



Remedy:

  • Turn off control power and turn it on again.

  • Do not establish communications during CX-Drive trial operation.

  • Confirm the speed/position command.

  • Set electronic gear ratio so command pulse frequency is 500 Kpps max.

  • Reduce backlash compensation amount.
Alarm 29

Error counter overflow
Cause:

(Initialization) Absolute encoder position / Gear ratio exceeded limits.

(Operation) Encoder pulse reference exceeded limits.

Position error in command unit exceeded limits.

Value on Final Distance for Origin Return (Pn825) exceeded limits.



Remedy:

  • Review operation range of Absolute encoder position and electronic gear ratio.

  • Check that motor rotates in accordance with position command.

  • Check that output torque is not saturated.

  • Adjust the gain.

  • Maximize set values on Torque Limits (Pn013, Pn522).

  • Wire the encoder correctly.
Alarm 30 (st)

Safety input error
Cause:

Safety input signal turned OFF during operation.



Remedy:

  • Check the statuses of safety inputs 1 and 2.
33

Interface I/O allocation error
Cause:
There is a duplicate setting in the I/O signal function allocation, or an undefined number specified.



Remedy:

  • Set the function allocation correctly.




Cause:
The latch input function is allocated incorrectly.



Remedy:

  • Assign it to IN5, IN6 and IN7.

  • Assign it in NO contact.

  • Assignments in all modes must be the same.
34

Overrun limit error
Cause:
The Overrun Limit Setting (Pn514) was exceeded during operation.



Remedy:

  • Adjust the gain.

  • Increase the set value of Pn514.

  • Set Pn514 to 0 to disable the function.
36

Parameter error
Cause:
There are data errors in the parameters that were read (Power ON).



Remedy:

  • Reset all parameters.




Cause:
The drive is faulty.



Remedy:

  • Replace the Servo Drive.
37

Parameters destruction
Cause:
The parameters that were read are corrupt.



Remedy:

  • Replace the Servo Drive.
38

Drive prohibition input error
Cause:
During trial operation, both Forward (POT) and Reverse (NOT) drive prohibition inputs became OFF.



Remedy:

  • Wire correctly.

  • Replace the limit sensor with a new one.

  • Confirm that the control power is input correctly.




Cause:
Command issued by CX-Drive when Drive Prohibition Input Selection (Pn504) was set to 0, and either POT or NOT was OFF.



Remedy:

  • Wire correctly / Replace sensor / Check power.

  • Move to the position where both POT and NOT do not turn off.

  • Gain an operation command by the CX-Drive.




Cause:
When Pn504 was set to 0, both POT and NOT inputs were OFF simultaneously (Servo ON or Operation).



Remedy:

  • Wire correctly / Replace sensor / Check power.

  • Confirm that Pn504 is set correctly.




Cause:
When Pn504 was set to 2, either POT or NOT input was OFF.



Remedy:

  • Wire correctly / Replace sensor / Check power.

  • Confirm that Pn504 is set correctly.
40 ABS

Absolute encoder system down error
Cause:
The voltage supplied to the absolute encoder is low.



Remedy:

  • Set up the absolute encoder.

  • Connect the battery power supply.
41 ABS

Absolute encoder counter overflow error
Cause:
The multi-rotation counter of the absolute encoder exceeds the specified value.



Remedy:

  • Properly set the Operation Switch when Using Absolute Encoder (Pn015).
42 ABS

Absolute encoder overspeed error
Cause:
The motor rotation speed exceeds the specified value when the battery power supply is turned ON.



Remedy:

  • Reduce the motor rotation speed and supply power.




Cause:
The wiring is incorrect.



Remedy:

  • Check the wiring.
43

Encoder initialization error
Cause:
The encoder is faulty.



Remedy:

  • Replace the Servomotor.
44 ABS

Absolute encoder 1-turn counter error
Cause:
The encoder is faulty.



Remedy:

  • Replace the Servomotor.
45 ABS

Absolute encoder multi-rotation counter error
Cause:
The encoder is faulty.



Remedy:

  • Replace the Servomotor.
47 ABS

Absolute encoder status error
Cause:
The motor was moving when the power supply was turned ON.



Remedy:

  • Do not let the motor move when the power supply is turned ON.
48

Encoder phase-Z error
Cause:
A phase Z pulse from the encoder was not detected regularly.



Remedy:

  • Replace the Servomotor.
49

Encoder PS signal error
Cause:
A logic error was detected in the PS signal from the encoder.



Remedy:

  • Replace the Servomotor.
50

External encoder communications error
Cause:
The disconnection detection function was activated because communications between the external encoder and drive were interrupted.



Remedy:

  • Wire correctly.

  • Fix the locations that are disconnected.




Cause:
There was a communications error in data from external encoder.



Remedy:

  • Provide the required external encoder power supply voltage.

  • Wire correctly.

  • Connect the shield to FG.
51

External encoder status error
Cause:
An external encoder error code was detected.



Remedy:

  • Check the external encoder specifications.

  • From the front panel, clear the external encoder error, then turn the power supply OFF, then ON again.
55

Phases-A, B and Z connection error
Cause:
A disconnection or other error was detected in external encoder phase A, phase B, or phase Z connection.



Remedy:

  • Check the connection.
82

Node address setting error
Cause:
The node address set by the rotary switches on the Drive exceeded the setting range.



Remedy:

  • Set the rotary switches for node address setting correctly. Turn on the control power again.
83

Communications error
Cause:
MECHATROLINK-II data was not received or failures continued more often than the value set in Pn800.



Remedy:

  • Wire the MECHATROLINK-II communications cable correctly.

  • Connect the Terminating Resistor correctly.

  • Confirm communications cable does not have excessive noise. Mount a ferrite core.

  • Increase the detection setting on the Pn800.
84

Transmission cycle error
Cause:
An error occurred when the synchronization is established (Power ON).



Remedy:

  • Turn off the power once, and turn it on again.

  • Replace the Servomotor or Servo Drive.




Cause:
Communication error or SYNC command issue during asynchronous state.



Remedy:

  • Wire the MECHATROLINK-II communications cable correctly.

  • Connect the Terminating Resistor correctly.

  • Confirm no excessive noise; mount a ferrite core.




Cause:
SYNC frames were not received according to transmission cycle while connection is being established.



Remedy:

  • Confirm cable wiring, termination, and noise shielding (ferrite core).
86

Watchdog data error
Cause:
An error occurred in the synchronization data of MECHATROLINK-II communications.



Remedy:

  • Confirm the updating process of the watchdog data by the host controller.
87

Forced alarm input error
Cause:
An Emergency Stop (STOP) signal was entered.



Remedy:

  • Turn OFF the Emergency Stop (STOP) signal.
90

CONNECT error
Cause:
A communications error occurred when a MECHATROLINK-II communications CONNECT command is received.



Remedy:

  • Wire the MECHATROLINK-II communications cable correctly.

  • Connect the Terminating Resistor correctly.

  • Confirm no excessive noise; mount a ferrite core.
91

SYNC command error
Cause:
During asynchronous MECHATROLINK-II communications, a synchronous type of command was issued.



Remedy:

  • Confirm the command sent by the host controller.
92 ABS

Encoder data restoration error
Cause:
In semi-closing control, initialization of internal position data is not processed correctly.



Remedy:

  • Apply the correct power voltage for the long encoder wire.

  • Install the motor power line separately from the encoder wire.

  • Connect the shield cable to FG.




Cause:
In FULL CLOSING CONTROL mode, initialization of internal position data is not processed correctly.



Remedy:

  • Apply the correct power voltage for the long connection cable for the external encoder.

  • Install the motor power line separately from the encoder wire.

  • Connect the shield cable to FG.
93

Parameter setting error
Cause:
The electronic gear ratio is inappropriate.



Remedy:

  • Confirm Pn009 and Pn010 are set correctly.

  • Settable range must be between 1/1000 and 1000.




Cause:
The value set on the external encoder ratio is inappropriate.



Remedy:

  • Confirm Pn324 and Pn325 are set correctly.

  • Settable range must be between 1/40 and 160.




Cause:
The External Feedback Pulse Type Selection (Pn323) differs from the connected external encoder type (serial).



Remedy:

  • Change the setting on the Pn323 to conform with the actual connected external encoder.
95

Motor non-conformity
Cause:
The motor and drive combination is incorrect.



Remedy:

  • Use a correct combination.




Cause:
The encoder wiring is disconnected.



Remedy:

  • Wire the encoder wiring.

  • Fix the locations that are disconnected.
A0
Overload warning
Cause:

The load ratio is 85% or more of the protection level.



Remedy:

  • Warning Output Selection (Pn440, Pn441): 1

  • Warning Mask Setting (Pn638): bit7
A1
Excessive regeneration warning
Cause:

The regeneration load ratio is 85% or more of the protection level.



Remedy:

  • Warning Output Selection (Pn440, Pn441): 2

  • Warning Mask Setting (Pn638): bit5
A2
Battery warning
Cause:

Battery voltage is 3.2 V or less.



Remedy:

  • Warning Output Selection (Pn440, Pn441): 3

  • Warning Mask Setting (Pn638): bit0
A3
Fan warning
Cause:

The fan stop status continues for 1 second.



Remedy:

  • Warning Output Selection (Pn440, Pn441): 4

  • Warning Mask Setting (Pn638): bit6
A4
Encoder communications warning
Cause:

The encoder communications errors occurred in series more frequently than the specified value.



Remedy:

  • Warning Output Selection (Pn440, Pn441): 5

  • Warning Mask Setting (Pn638): bit4
A5
Encoder overheating warning
Cause:

The encoder detects the overheat warning.



Remedy:

  • Warning Output Selection (Pn440, Pn441): 6

  • Warning Mask Setting (Pn638): bit3
A6
Vibration detection warning
Cause:

Vibrating is detected.



Remedy:

  • Warning Output Selection (Pn440, Pn441): 7

  • Warning Mask Setting (Pn638): bit9
A7
Life expectancy warning
Cause:

The life expectancy of the capacitor or the fan is shorter than the specified value.



Remedy:

  • Warning Output Selection (Pn440, Pn441): 8

  • Warning Mask Setting (Pn638): bit2
A8
External encoder error warning
Cause:

The external encoder detects a warning.



Remedy:

  • Warning Output Selection (Pn440, Pn441): 9

  • Warning Mask Setting (Pn638): bit8
A9
External encoder communications warning
Cause:

The external encoder has communications errors in series more than the specified value.



Remedy:

  • Warning Output Selection (Pn440, Pn441): 10

  • Warning Mask Setting (Pn638): bit10
94
Data setting warning
Cause:

  • The set value on the command argument is out of the specified range.

  • Parameter writing fails.

  • The command set value is incorrect.




Remedy:

  • Warning Output Selection (Pn440, Pn441): 11

  • Warning Mask Setting (Pn638): bit4
95
Command warning
Cause:

  • The command transmission conditions are not met.

  • The sub-command transmission conditions are not met.

  • A rotation command is given in the prohibited direction after the motor made an emergency stop due to a drive prohibition input.




Remedy:

  • Warning Output Selection (Pn440, Pn441): 12

  • Warning Mask Setting (Pn638): bit5
96
MECHATROLINK-II communications warning
Cause:

One or more MECHATROLINK-II communications error occur.



Remedy:

  • Warning Output Selection (Pn440, Pn441): 13

  • Warning Mask Setting (Pn638): bit6