OC01 / OC02
Overcurrent
(Display: oc 01 / oc 02)
The output current of the servo amplifier exceeds the rated value.
OC01: Direct detection
OC02: Indirect detection
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Cause:
- Wrong servomotor output wiring.
- Short circuit or grounding fault in servomotor output wiring.
- Servomotor insulation fault.
- Failure of servomotor.
- Incorrect resistance of braking resistor.
- Current imbalance caused by an encoder fault.
- Unconnected grounding cable.
Remedy:
- Correct the wiring of power cables (U, V and W).
- Check cables visually or through continuity check and replace the defective cable.
- Measure the insulation resistance (Several MΩ or over to ground).
- Measure the resistance across cables (Several Ω between cables).
- Replace with the braking resistor within the rating.
- Replace the servomotor.
- Connect the grounding cable.
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oS
Overspeed
(Display: oS)
The rotation speed of the servomotor exceeds 1.1 times the maximum speed.
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Cause:
- Wrong servomotor output wiring.
- The rotation speed of the servomotor overshoots.
Remedy:
- Correct the wiring of power cables (U, V and W).
- Check the speed waveform during acceleration with the PC Loader. Take the following countermeasures:
- Increase PA1_37 (acceleration time).
- Increase PA1_52 (S-curve time constant).
- Increase PA1_56 (speed loop gain 1).
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Lu / cn
Control Power Undervoltage
(Display: Lu cn)
The voltage of the control power supplied to the servo amplifier temporarily drops below the minimum specification limit.
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Cause:
- The source voltage drops due to momentary power failure or similar.
- Poor power supply capacity of transformer, etc.
Remedy:
- Check the power supply environment for momentary power failure and improve the environment.
- Check and improve the power supply capacity and transformer capacity.
- Replace the transformer, etc.
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Hu
Overvoltage
(Display: Hu)
The DC voltage inside the servo amplifier exceeds the upper limit (approx 420V).
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Cause:
- The source voltage is too high (immediately after power-on).
- Unconnected internal regenerative resistor.
- The regenerative energy is high.
- Unconnected external braking resistor or wrong wiring.
- Broken braking transistor.
Remedy:
- Check if the source voltage is within the specification limits.
- Insert a reactor if there is a power factor improvement capacitor.
- Check the short-circuit wire between the RB2 and RB3 terminals.
- Use an external regenerative resistor.
- Connect the external braking resistor and correct its wiring.
- Replace the servo amplifier.
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Et01 / Et02
Encoder Trouble
(Display: Et 01 / Et 02)
There is a fault in the encoder built in the servomotor.
Et01: Single revolution position detection fault
Et02: Encoder memory data reading fault
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Cause:
- Fault in data sent from encoder.
- Failure of encoder.
Remedy:
- Use shielded cables to eliminate noise effects.
- Replace the servomotor.
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dE
Memory Error
(Display: dE)
The parameter data stored in the servo amplifier is damaged.
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Cause:
- Failure of stored data.
- The parameter overwriting frequency has exceeded 100,000 cycles.
- The servo-on is turned on without turning the power off and then on after the parameter was initialized.
Remedy:
- Using the PC Loader, read parameters and enter those indicated in red.
- Initialize parameters.
- Turn the power off then on again. If restoration is not obtained, replace the servo amplifier.
- Replace the servo amplifier (if overwrite limit exceeded).
- Supply the power again.
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cE
Motor Combination Error
(Display: cE)
The capacity and model of the servo amplifier do not agree with those of the connected servomotor.
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Cause:
- The capacity and model of the servo amplifier do not agree with those of the servomotor.
Remedy:
- Check the capacity and model of the servomotor and those of the servo amplifier.
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Ec
Encoder Communication Error
(Display: Ec)
Communications with the internal encoder of the servomotor fails.
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Cause:
- Interrupted encoder communications.
- Broken wire or poor contact.
- Noise interference (route cable near magnetic fields).
Remedy:
- Check cables visually and through continuity check and correct faults.
- Check for the broken wire in the encoder cable and correct.
- Insert ferrite cores.
- Do not route the encoder cable in a strong magnetic or electric field. Route separately from power lines.
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co nt
CONT (control signal) Error
(Display: co nt)
There is duplication in allocation of sequence input terminals of the servo amplifier.
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Cause:
- The same input signal is allocated to two or more terminals.
Remedy:
- Do not specify the same number among CONT signal settings.
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oL 01 / oL 02
Overload
(Instantaneous alarm or Effective torque exceeds limit) |
Cause:
- The servomotor fails to rotate mechanically.
- The mechanical system is too heavy against the servomotor capacity.
- The acceleration/deceleration frequency and operation frequency are too high.
- Servo amplifier is damaged.
Remedy:
- Check if the brake is active.
- Examine the servomotor capacity, based on the load factor.
- If rotation speed can be reduced, add a reduction gear.
- Apply the brake to retain a stopped elevator.
- Increase the cycle time and decrease the operation frequency.
- Replace the servo amplifier.
- If OL02 occurs without damage/wiring issues, examine servomotor capacity.
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rH 04
Inrush Current Suppression Circuit Trouble |
Cause:
- The servo amplifier is damaged.
- The ambient temperature exceeds 55°C.
- The power is frequently supplied.
Remedy:
- Replace the servo amplifier.
- Keep the ambient temperature 55°C or lower (40°C or below is recommended).
- Move heat generating bodies near the servo amplifier as far away as possible.
- Reduce the frequency of turning the power on/off (Reference: once an hour or less).
- Note: If detected when temp is below 55°C, replace amplifier.
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SF tY
Safety function error |
Cause:
- The [EN1+], [EN2+] terminal input mismatch continued for 50 ms or longer.
- The function safety module (WSU-ST1) output an alarm.
- A servo amplifier or function safety module (WSU-ST1) fault occurred.
Remedy:
- Check for wiring abnormalities such as disconnection or shorting in the [EN1+], [EN2+] terminal wiring.
- Reduce the [EN1+], [EN2+] terminal input mismatch time to 50 ms or less.
- Refer to the function safety module (WSU-ST1) User’s Manual.
- Turn power OFF/ON. If not resolved, replace servo amplifier or safety module.
- Check the function safety module mounting condition.
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Lu Po
Main Power Undervoltage |
Cause:
- The source voltage drops due to momentary power failure or similar.
- The power is turned on or off intentionally.
- DC input is under execution.
Remedy:
- Check the power supply environment (momentary failure) and improve capacity/transformer.
- Do not turn the power on after the time specified in PA2_68 has elapsed.
- Set PA2_68 (main power shutoff detection time) at 1000 [ms].
- If environment is adverse, PA2_67 can be applied to ignore undervoltage detection.
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rH 01
Internal Braking Resistor Overheat |
Cause:
- Excessive source voltage (immediately after power-on).
- Due to vertical transfer or winding purpose, regenerative power cannot be consumed.
Remedy:
- Check if the source voltage is within specification limits.
- Insert a reactor if there is a power factor improvement capacitor.
- Increase the deceleration time.
- Decrease the servomotor rotation speed.
- Increase the cycle time and decrease the operation frequency.
- Connect an external braking resistor.
- Install a counterweight.
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rH 02
External Braking Resistor Overheat |
Cause:
- Excessive source voltage (immediately after power-on).
- Due to vertical transfer or winding purpose, regenerative power cannot be consumed.
- Wrong wiring of external braking resistor overheat signal.
Remedy:
- Check if the source voltage is within the specification limits.
- Increase the deceleration time.
- Decrease the servomotor rotation speed.
- Increase the cycle time and decrease the operation frequency.
- Connect an external braking resistor or install a counterweight.
- Connect the wiring correctly.
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rH 03
Braking Transistor Error |
Cause:
- The braking transistor is short circuited or damaged.
Remedy:
- Turn the power off then on again. If the alarm persists, replace the servo amplifier.
- Note: If short circuited/damaged, fire may be caused. Turn power off immediately.
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oF
Deviation Overflow |
Cause: Wrong connection of power cables; Servomotor mechanically locked; Low output torque; Deviation detection width is small; Amplifier is in P control mode; Low gain; Rapid acceleration/deceleration; External pulse phase mismatch.
Remedy:
- Check and correct the wiring of power cables (U, V and W).
- Check if the brake is applied.
- Increase torque limit values (PA1_27 and 28).
- Increase the deviation overflow detection value (PA2_69) or External/Motor deviation over detection value (PA4_36).
- Turn off the P motion signal.
- Perform gain adjustment.
- Increase the acceleration/deceleration time.
- Check the set value of PA4_32 (external pulse phase selection).
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AH
Amplifier Overheat |
Cause: The ambient temperature exceeds 55 [°C]; Heat generating bodies are too close.
Remedy:
- Reduce the ambient temperature to 55 [°C] or lower (40 [°C] recommended).
- Move heat generating bodies near the servo amplifier as far away as possible.
- Perform operation at a continuous load factor within 100%.
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EH
Encoder Overheat |
Cause: Excessive ambient temperature; The effective torque exceeds the rating.
Remedy:
- Reduce the ambient temperature of the servomotor to 40 [°C] or lower.
- Remove shields interrupting heat radiation, if there are any.
- Increase the cycle time and reduce the operation frequency.
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dL 01 / dL 02 / dL 03
Absolute Data Lost |
Cause:
dL01: Battery voltage drop, broken cable.
dL02: Multi-turn data fault in encoder.
dL03: Detection at power-on after an Et alarm.
Remedy:
- dL01: Replace the battery and preset the position. Check if encoder cable is broken.
- dL02: Perform position preset. If the alarm persists, replace the servomotor.
- dL03: Perform position preset. If the Et alarm is not canceled, replace the servomotor.
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AF
Multi-turn Data Overflow |
Cause: Excessive servomotor revolutions (Output shaft exceeds range between -32766 and +32765).
Remedy:
- Check the servomotor revolutions.
- Use the PC Loader or take similar measures to check the current position.
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iE
Initial Error |
Cause: The encoder is damaged; Power turned on while the servomotor rotates on external force.
Remedy:
- Replace the servomotor.
- Stop the servomotor and turn the power off then on again. If restoration is not obtained, replace the servomotor.
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HF
Command Pulse Frequency Error |
Cause: Gear Ratio was changed; The set value of pulse such as electronic gear setting is large.
Remedy:
- Review the master processing.
- Set the ratio of pulses to an appropriate setting value.
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oL 03
Overload 3 (Output open-phase) |
Cause: The servomotor fails to rotate mechanically.
Remedy:
- Check the wiring of power cables (U, V and W) and correct faults.
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cY
Cycle communication error |
Cause: An error occurred during EtherCAT communication.
Remedy:
- Check the condition of the communication cable (disconnection, etc.), and fix if necessary.
- Insert a ferrite core into the communication cable.
- Adjust the interval between the communication timing and DC timing.
- Check whether the ESM State is other than OP with servo-on.
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