Nissei Corporation


No.3 The noise and vibration are large

Gearmotor, gearmotor with brake [Cause and countermeasure]

The noise and vibration are large

Defect of the power source, wiring, or control (3.1)

Gearmotor, gearmotor with brake

Classification No. Cause Countermeasure Inspection procedure and action Judging criterion
3.1.1 Operation under phase loss Input 3-phase
securely
Check the interphase voltage. Investigate the electromagnetic switch, fuse, etc. and repair or replace them The interphase voltages are almost the same
3.1.2 Defect of the operation of the electromagnetic switch Replacement Check the continuity of the electromagnetic switch and the interphase voltage of the load side The interphase voltages are almost the same
3.1.3 Mismatch between the inverter and motor Setting of
the optimal constant
Input the automatic tuning or motor constant The motor frame temperature is within the Nissei guaranteed value range
No abnormal vibration, noise, etc. occurs
3.1.4 The torque in the low-speed area is insufficient during inverter operation Review of the torque boost valuein the case of V/F control.
Review of the wiring length.
Apply vector control and apply automatic tuning
Check the torque boost value of the inverter. Apply vector control and apply automatic tuning The motor rotates in the low-speed area and the motor frame temperature is within the Nissei guaranteed value range
3.1.5 The brake wiring is not appropriate when the inverter is used Review it and assembly the circuit securely Check whether the circuit is assembled as recommended by the manufacturer Circuit recommended in the catalog or instruction manual
3.1.6 Disconnection or connection defect of the brake line Connect the wire securely Check continuity of the connected part There is continuity of the connected part
3.1.7 Defect of the circuit design or wiring of the brake circuit Review it and assembly the circuit securely Check whether the circuit is assembled as recommended by the manufacturer Circuit recommended in the catalog or instruction manual
3.1.8 Defect of the SSR operation of the brake circuit Review Check the pressure resistance value of SSR It is equivalent to or less than the pressure resistance value written on the surface of SSR
3.1.9 Breakage of the rectifier Replacement Contact Nissei to check the continuity of each terminal of the rectifier Contact Nissei for the check method and check the appropriateness
3.1.10 The capacitor capacity is large Replace the capacitor with a one with the specified capacity Check the capacity written on the capacitor The capacity written on the capacitor and that written on the nameplate value are the same

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Defect of the motor (3.2)

Gearmotor, gearmotor with brake

Classification No. Cause Countermeasure Inspection procedure and action Judging criterion
3.2.1 Disconnection of
the stator winding
Repair by Nissei Measure the interphase resistance of the motor Report the interphase resistance to Nissei and check whether it it within the allowable range
3.2.2 Layer short circuit
of the stator winding
Repair by Nissei Measure the interphase resistance of the motor Report the interphase resistance to Nissei and check whether it it within the allowable range
3.2.3 Input power source abnormality Input the specified voltage Check the interphase voltage of the motor end Voltage and frequency written on the nameplate
3.2.4 Governor switch
operation defect
Repair by Nissei Check the operation and current value of the breaker and fuse The motor does not rotate without load or the current value does not exceed the nameplate value with load
3.2.5 Damage or breakage of
the bearing or shaft
Repair by Nissei If the output shaft can be rotated, check the load Contact Nissei for the reverse rotation torque and check whether it is within the allowable range.
No abnormal vibration occurs
3.2.6 Loosening of the motor
mounting screws
Retighten the bolts Check whether there is no play in the motor and, if any, retighten the bolts for connection with the gear Contact Nissei for the tightening torque and check whether it is within the allowable range.
3.2.7 Contact between the fan
and fan cover
Repair or
replacement
Check appearance of the fan cover They do not contact each other

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Defect of the gear head (3.3)

Gearmotor, gearmotor with brake

Classification No. Cause Countermeasure Inspection procedure and action Judging criterion
3.3.1 Scratch on the gear (intermittent sound) Repair by Nissei Contact Nissei  
3.3.2 Wear of the gear (continuous sound) Repair by Nissei Contact Nissei  
3.3.3 Damage or breakage of the bearing or shaft Repair by Nissei Check whether the motor is rotating, 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 brake (3.4)

Gearmotor, gearmotor with brake

Classification No. Cause Countermeasure Inspection procedure and action Judging criterion
3.4.1 Rubbing due to a defect of the cap Cap adjustment Check the gap between the armature and field with a thickness gauge Gap amount recommended in the catalog or instruction manual
3.4.2 Rubbing due to burnout of the brake coil Replacement Measure the internal resistance of the brake Contact Nissei for the internal resistance and check whether it it within the allowable range
3.4.3 Rubbing due to jamming of a foreign matter Disassembly and cleaning Check that the shaft moves smoothly when the power source is applied to the brake  
3.4.4 Input power source abnormality Input the specified voltage Check the brake input voltage Report the input voltage to Nissei and check whether it it within the allowable range

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Defect of the installation or couplings (3.5)

Gearmotor, gearmotor with brake

Classification No. Cause Countermeasure Inspection procedure and action Judging criterion
3.5.1 Loosening of the case mounting bolts Retighten the bolts Check whether there is no play in the reducer with motor and, if any, retighten the bolts for connection with the gear Contact Nissei for the tightening torque
and check whether it is
within the allowable range
3.5.2 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
3.5.3 Insufficient rigidity of the mounting base Reinforce the mounting base
to improve the rigidity
Check that no abnormal vibration nor noise occurs No abnormal vibration nor noise occurs

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Defect of a load part or operating conditions (3.6)

Gearmotor, gearmotor with brake

Classification No. Cause Countermeasure Inspection procedure and action Judging criterion
3.6.1 Resonance of the load Displace the resonance point Adjust the balance of the load part No abnormal vibration nor noise occurs

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