Nissei Corporation


No.2 Abnormal heating

Gearmotor, gearmotor with brake [Cause and countermeasure]

Abnormal heating

Defect of the power source, wiring, or control (2.1)

Gearmotor, gearmotor with brake

Classification No. Cause Countermeasure Inspection procedure and action Judging criterion
2.1.1 Operation under phase loss (1-phase operation) 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
2.1.2 Decrease in the power voltage Securing of a sufficient voltage source capacity Calculate the current of the outline specifications from the nameplate value and check whether the capacity is exceeding the allowable value Report the capacity (KVA) to Nissei and check whether it is within the allowable range
2.1.3 Voltage drop due to the wiring length Review of the wiring length and wire size Check the interphase voltage of the motor end with the operation status Report the interphase voltage to Nissei and check whether it is within the allowable range
2.1.4 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
2.1.5 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
2.1.6 The torque boost value is high and the motor rotates in the low-speed area during inverter operation Lower the torque boost value Check the torque boost value of the inverter The motor rotates in the low-speed area and the motor frame temperature is within the manufacturer guaranteed value range
2.1.7 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 Circuit recommended in the catalog or instruction manual
2.1.8 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
2.1.9 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 Nissei Circuit recommended in the catalog or instruction manual
2.1.10 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
2.1.11 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
2.1.12 The capacitor capacity is large
(1-phase)
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

Page top

Defect of the motor (2.2)

Gearmotor, gearmotor with brake

Classification No. Cause Countermeasure Inspection procedure and action Judging criterion
2.2.1 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
2.2.2 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
2.2.3 Input power source abnormality Input the specified voltage Check the interphase voltage of the motor end Voltage and frequency written on the nameplate
2.2.4 Governor switch
operation defect
Replacement 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
2.2.5 Damage or breakage of
the bearing or shaft
Repair or replacement 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
2.2.6 Contact between
the fan and fan cover
Removal and replacement
of the contacting and interfering parts
Check appearance of the fan cover They do not contact each other
2.2.7 Intrusion of grease
from the gear head
Replacement Check the no-load current amount Report the no-load current to Nissei and check whether it is within the allowable range

Page top

Defect of the gear head (2.3)

Gearmotor, gearmotor with brake

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

Page top

Defect of the brake (2.4)

Gearmotor, gearmotor with brake

Classification No. Cause Countermeasure Inspection procedure and action Judging criterion
2.4.1 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
2.4.2 Disconnection of the brake coil Repair by Nissei Measure the internal resistance of the brake Contact Nissei for the internal resistance and check whether it it within the allowable range
2.4.3 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
2.4.4 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  
2.4.5 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

Page top

Defect of the installation or couplings (2.5)

Gearmotor, gearmotor with brake

Classification No. Cause Countermeasure Inspection procedure and action Judging criterion
2.5.1 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
2.5.2 The fan cover is too close to the wall Separate the fan cover from the wall Separate the fan cover from the wall as much as possible Contact Nissei for the surface temperature and check whether it it within the allowable range
2.5.3 Clogging of the fan cover Clean Remove dust and foreign matters in the air duct Contact Nissei for the surface temperature and check whether it it within the allowable range
2.5.4 The ambient temperature is high Improve the ventilation Check the ventilation. Consult Nissei Contact Nissei for the surface temperature and check whether it it within the allowable range

Page top

Defect of a load part or operating conditions (2.6)

Gearmotor, gearmotor with brake

Classification No. Cause Countermeasure Inspection procedure and action Judging criterion
2.6.1 Selection error
for the load
Re-selection
and replacement
Check that the current value is within the rated current value It is equivalent to or below the rated current value written on the nameplate
2.6.2 Overload Remove
the load
Check that the current value is within the rated current value It is equivalent to or below the rated current value written on the nameplate
2.6.3 The startup and stop frequencyis too high Lower
the frequency
Make the startup and stop frequency equivalent to or less then the value recommended by the manufacturer Contact Nissei for the surface temperature and check whether it it within the allowable range
2.6.4 Excessive
overhung load
Remove
the load
Check that it is equivalent to or less than the allowable O.H.L. value presented by the manufacturer It is equivalent to or less than the allowable O.H.L. value written on the catalog
2.6.5 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

Page top

Product name search