Nissei Corporation


No.2 Abnormal heating

Reducer (without motor) [Cause and countermeasure]

Abnormal heating

Defect of the gear head (2.1)

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Classification No. Cause Countermeasure Inspection procedure and action Judging criterion
2.1.1 Breakage or wear of the gear Repair by Nissei No abnormal noise occurs and the output shaft rotates smoothly Contact Nissei for the reverse rotation torque and check whether it is within the allowable range
No abnormal vibration nor noise occurs
2.1.2 Breakage of the bearing or shaft Repair by Nissei No abnormal noise occurs and the output shaft rotates smoothly Contact Nissei for the reverse rotation torque and check whether it is within the allowable range
No abnormal vibration nor noise occurs

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Defect of the installation or couplings (2.2)

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Classification No. Cause Countermeasure Inspection procedure and action Judging criterion
2.2.1 Inconsistency of the centers of the shafts Align the centers of the shafts with each other Check the misalignment amount Report the misalignment amount to the coupling manufacturer and check whether it is within the allowable range
2.2.2 The ambient temperature is high Improve the ventilation Check the ventilation. Consult the manufacturer Contact Nissei for the surface temperature and check whether it it within the allowable range

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Defect of a load part or operating conditions (2.3)

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Classification No. Cause Countermeasure Inspection procedure and action Judging criterion
2.3.1 Selection error for the load Re-selection and replacement Check that the current value of the driving force is within the rated current value It is equivalent to or below the rated current value written on the nameplate of the driving part
2.3.2 Overload Remove the load Check that the current value of the driving force is within the rated current value It is equivalent to or below the rated current value written on the nameplate of the driving part
2.3.3 Excessive overhung load Remove the load Check that it is equivalent to or less than the allowable O.H.L. value It is equivalent to or less than the allowable O.H.L. value written on the catalog
2.3.4 Too much tension of the belt and chain Loosen them Check that the tension is equivalent to or less than the value recommended by the manufacturers Report the slack amount to the belt and chain manufacturers and check whether it is within the allowable range

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