Gearmotors and Reducers
No.1 The gear does not rotate, The speed does not increase
No.1 The gear does not rotate, The speed does not increase
Gearmotor, gearmotor with brake [Cause and countermeasure]
The gear does not rotate, The speed does not increase
Defect of the power source, wiring, or control (1.1)
Gearmotor, gearmotor with brake
| Classification No. | Cause | Countermeasure | Inspection procedure and action | Judging criterion |
|---|---|---|---|---|
| 1.1.1 | The power source line is not a live wire | Close the circuit breaker for wiring to make the power source line a live wire | Turn on the circuit breaker for wiring and check the interphase voltage | Report the interphase voltage to NISSEI CORPORATION and check whether it is within the allowable range |
| 1.1.2 | Decrease in the power voltage | Securing of a sufficient voltage source capacity | Calculate the electricity from the nameplate values of the current and voltage of the outline specifications and check whether the capacity is sufficient | Report the capacity (KVA) to NISSEI CORPORATION and check whether it is within the allowable range |
| 1.1.3 | 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 CORPORATION and check whether it is within the allowable range |
| 1.1.4 | Disconnection of the connecting wire (phase Loss) or connection defect | Connect the wire securely | Check continuity of the connected part | There is continuity of the connected part |
| 1.1.5 | The thermal of the relay is working | Review of the thermal setting value | Check the thermal setting value and rated current value | Current value written on the nameplate |
| 1.1.6 | The electronic thermal of the inverter is working | Review of the thermal value in the case of V/F control. Apply vector control and apply automatic tuning | Check that the current value does not rise abnormally when the frequency is lowered with the same load. Apply vector control and apply automatic tuning | Current value written on the nameplate |
| 1.1.7 | The torque in the low-speed area is insufficient during inverter operation | Review of the torque boost value in 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 CORPORATION guaranteed value range |
| 1.1.8 | The overcurrent breaking function of the inverter is working | Extend the acceleration and deceleration time | Check the acceleration and deceleration time value of the inverter | There is no overcurrent breaking |
| 1.1.9 | 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 |
| 1.1.10 | 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 voltage of the primary and secondary sides of the electromagnetic switches are the same |
| 1.1.11 | 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 |
| 1.1.12 | 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 | Circuit recommended in the catalog or instruction manual |
| 1.1.13 | 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 |
| 1.1.14 | Breakage of the rectifier | Replacement | Contact NISSEI CORPORATION to check the continuity of each terminal of the rectifier | Contact NISSEI CORPORATION for the check method and check the appropriateness |
| 1.1.15 | Forgetting to connect the capacitor (1-phase) | Connect the wire securely | Voltage between both terminals of the capacitor | It is connected |
| 1.1.16 | Breakage of the capacitor (1-phase) | Replacement | Check the appearance and measure the capacity if your have a capacity measuring machine | The capacity is within the allowable range written on the surface of the capacitor |
| 1.1.17 | Error of the capacity of the capacitor (1-phase) | Replacement | Check the capacity written on the capacitor and the nameplate value | The capacity written on the capacitor and that written on the nameplate value are the same |
| 1.1.18 | Difference in the pressure resistance of the capacitor (1-phase) | Replacement | Check the rated voltage written on the capacitor | The guideline is the pressure resistance written on the capacitor > supply voltage x 2 |
Defect of the motor (1.2)
Gearmotor, gearmotor with brake
| Classification No. | Cause | Countermeasure | Inspection procedure and action | Judging criterion |
|---|---|---|---|---|
| 1.2.1 | Disconnection of the stator winding | Repair by NISSEI CORPORATION | Measure the interphase resistance of the motor | Report the interphase resistance to NISSEI CORPORATION and check whether it is within the allowable range |
| 1.2.2 | Burnout of the stator winding | Repair by NISSEI CORPORATION | Measure the interphase resistance of the motor | Report the interphase resistance to NISSEI CORPORATION and check whether it is within the allowable range |
| 1.2.3 | Input power source abnormality | Input the specified voltage | Check the interphase voltage of the motor end | Voltage and frequency written on the nameplate |
| 1.2.4 | Governor switch operation defect (1-phase) | Repair by NISSEI CORPORATION | 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 |
| 1.2.5 | Breakage of the bearing or shaft | Repair by NISSEI CORPORATION | If the output shaft can be rotated, check the load | Contact the manufacturer for the reverse rotation torque and check whether it is within the allowable range. No abnormal vibration occurs |
| 1.2.6 | 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 |
Defect of the gear head (1.3)
Gearmotor, gearmotor with brake
| Classification No. | Cause | Countermeasure | Inspection procedure and action | Judging criterion |
|---|---|---|---|---|
| 1.3.1 | Breakage or wear of the gear | Repair by NISSEI CORPORATION | Check whether the motor is rotating, no abnormal noise occurs, and the output shaft rotates | Contact NISSEI CORPORATION for the reverse rotation torque and check whether it is within the allowable range. No abnormal vibration nor noise occurs |
| 1.3.2 | Breakage of the bearing or shaft | Repair by NISSEI CORPORATION | Check whether the motor is rotating, no abnormal noise occurs, and the output shaft rotates | Contact NISSEI CORPORATION for the reverse rotation torque and check whether it is within the allowable range. No abnormal vibration nor noise occurs |
Defect of the brake (1.4)
Gearmotor, gearmotor with brake
| Classification No. | Cause | Countermeasure | Inspection procedure and action | Judging criterion |
|---|---|---|---|---|
| 1.4.1 | 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 |
| 1.4.2 | Burnout of the brake coil | Repair by NISSEI CORPORATION | Measure the internal resistance of the brake | Contact NISSEI CORPORATION for the internal resistance and check whether it is within the allowable range |
| 1.4.3 | Disconnection of the brake coil | Repair by NISSEI CORPORATION | Measure the internal resistance of the brake | Contact NISSEI CORPORATION for the internal resistance and check whether it is within the allowable range |
| 1.4.4 | Jamming of a foreign matter | Disassembly and cleaning | Check that the shaft moves smoothly when the power source is applied to the brake | |
| 1.4.5 | Input power source abnormality | Input the specified voltage | Check the brake input voltage | Report the input voltage to NISSEI CORPORATION and check whether it is within the allowable range |
Defect of the installation or couplings (1.5)
Gearmotor, gearmotor with brake
| Classification No. | Cause | Countermeasure | Inspection procedure and action | Judging criterion |
|---|---|---|---|---|
| 1.5.1 | Breakage of the case installation part | Replacement | Check whether the case is broken or cracked | The case is not broken or cracked |
| 1.5.2 | 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 |
| 1.5.3 | The couplings spin free | Fix the couplings with the shaft | Check whether the key or mounting screws are installed securely | There is no relative sliding of the shaft connected with the output shaft by the couplings |
Defect of a load part or operating conditions (1.6)
Gearmotor, gearmotor with brake
| Classification No. | Cause | Countermeasure | Inspection procedure and action | Judging criterion |
|---|---|---|---|---|
| 1.6.1 | 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 |
| 1.6.2 | 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 |
| 1.6.3 | The temperature sensor is working | 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 |
| 1.6.4 | 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 |
| 1.6.5 | Contact Positioning Control | Removal of interference | Remove interference if you hear the motor sound | It is equivalent to or below the rated current value written on the nameplate |
| 1.6.6 | 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 |