Nissei Corporation


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.CauseCountermeasureInspection procedure and actionJudging criterion
1.1.1The power source line is not a live wireClose the circuit breaker for wiring to make the power source line a live wireTurn on the circuit breaker for wiring and check the interphase voltageReport the interphase voltage to Nissei and check whether it is within the allowable range
1.1.2Decrease in the power voltageSecuring of a sufficient voltage source capacityCalculate the electricity from the nameplate values of the current and voltage of the outline specifications and check whether the capacity is sufficientReport the capacity (KVA) to Nissei and check whether it it within the allowable range
1.1.3Voltage drop due to the wiring lengthReview of the wiring length and wire sizeCheck the interphase voltage of the motor end with the operation statusReport the interphase voltage to Nissei and check whether it it within the allowable range
1.1.4Disconnection of the connecting wire (phase Loss) or connection defectConnect the wire securelyCheck continuity of the connected partThere is continuity of the connected part
1.1.5The thermal of the relay is workingReview of the thermal setting valueCheck the thermal setting value and rated current valueCurrent value written on the nameplate
1.1.6The electronic thermal of the inverter is workingReview of the thermal value in the case of V/F control. Apply vector control and apply automatic tuningCheck that the current value does not rise abnormally when the frequency is lowered with the same load. Apply vector control and apply automatic tuningCurrent value written on the nameplate
1.1.7The torque in the low-speed area is insufficient during inverter operationReview 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 tuningThe motor rotates in the low-speed area and the motor frame temperature is within the Nissei guaranteed value range
1.1.8The overcurrent breaking function of the inverter is workingExtend the acceleration and deceleration timeCheck the acceleration and deceleration time value of the inverterThere is no overcurrent breaking
1.1.9The brake wiring is not appropriate when the inverter is usedReview it and assembly the circuit securelyCheck whether the circuit is assembled as recommendedCircuit recommended in the catalog or instruction manual
1.1.10Defect of the operation of the electromagnetic switchReplacementCheck the continuity of the electromagnetic switch and the interphase voltage of the load sideThe interphase voltage of the primary and secondary sides of the electromagnetic switches are the same
1.1.11Disconnection or connection defect of the brake lineConnect the wire securelyCheck continuity of the connected partThere is continuity of the connected part
1.1.12Defect of the circuit design or wiring of the brake circuitReview it and assembly the circuit securelyCheck whether the circuit is assembled as recommendedCircuit recommended in the catalog or instruction manual
1.1.13Defect of the SSR operation of the brake circuitReviewCheck the pressure resistance value of SSRIt is equivalent to or less than the pressure resistance value written on the surface of SSR
1.1.14Breakage of the rectifierReplacementContact Nissei to check the continuity of each terminal of the rectifierContact Nissei for the check method and check the appropriateness
1.1.15Forgetting to connect the capacitor (1-phase)Connect the wire securelyVoltage between both terminals of the capacitorIt is connected
1.1.16Breakage of the capacitor (1-phase)ReplacementCheck the appearance and measure the capacity if your have a capacity measuring machineThe capacity is within the allowable range written on the surface of the capacitor
1.1.17Error of the capacity of the capacitor (1-phase)ReplacementCheck the capacity written on the capacitor and the nameplate valueThe capacity written on the capacitor and that written on the nameplate value are the same
1.1.18Difference in the pressure resistance of the capacitor (1-phase)ReplacementCheck the rated voltage written on the capacitorThe guideline is the pressure resistance written
on the capacitor > supply voltage x 2

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Defect of the motor (1.2)

Gearmotor, gearmotor with brake

Classification No.CauseCountermeasureInspection procedure and actionJudging criterion
1.2.1Disconnection of the stator windingRepair by NisseiMeasure the interphase resistance of the motorReport the interphase resistance to Nissei and check whether it it within the allowable range
1.2.2Burnout of the stator windingRepair by NisseiMeasure the interphase resistance of the motorReport the interphase resistance to Nissei and check whether it it within the allowable range
1.2.3Input power source abnormalityInput the specified voltageCheck the interphase voltage of the motor endVoltage and frequency written on the nameplate
1.2.4Governor switch operation defect (1-phase)Repair by NisseiCheck the operation and current value of the breaker and fuseThe motor does not rotate without load or the current value does not exceed the nameplate value with load
1.2.5Breakage of the bearing or shaftRepair by NisseiIf the output shaft can be rotated, check the loadContact the manufacturer for the reverse rotation torque and check whether it is within the allowable range. No abnormal vibration occurs
1.2.6Contact between the fan and fan coverRemoval and replacement of the contacting and interfering partsCheck appearance of the fan coverThey do not contact each other

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Defect of the gear head (1.3)

Gearmotor, gearmotor with brake

Classification No.CauseCountermeasureInspection procedure and actionJudging criterion
1.3.1Breakage or wear of the gearRepair by NisseiCheck whether the motor is rotating, no abnormal noise occurs, and the output shaft rotatesContact Nissei for the reverse rotation torque and check whether it is within the allowable range. No abnormal vibration nor noise occurs
1.3.2Breakage of the bearing or shaftRepair by NisseiCheck whether the motor is rotating, no abnormal noise occurs, and the output shaft rotatesContact 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 (1.4)

Gearmotor, gearmotor with brake

Classification No.CauseCountermeasureInspection procedure and actionJudging criterion
1.4.1Defect of the capCap adjustmentCheck the gap between the armature and field with a thickness gaugeGap amount recommended in the catalog or instruction manual
1.4.2Burnout of the brake coilRepair by NisseiMeasure the internal resistance of the brakeContact Nissei for the internal resistance and check whether it it within the allowable range
1.4.3Disconnection of the brake coilRepair by NisseiMeasure the internal resistance of the brakeContact Nissei for the internal resistance and check whether it it within the allowable range
1.4.4Jamming of a foreign matterDisassembly and cleaningCheck that the shaft moves smoothly when the power source is applied to the brake 
1.4.5Input power source abnormalityInput the specified voltageCheck the brake input voltageReport the input voltage to Nissei and check whether it it within the allowable range

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Defect of the installation or couplings (1.5)

Gearmotor, gearmotor with brake

Classification No.CauseCountermeasureInspection procedure and actionJudging criterion
1.5.1Breakage of the case installation partReplacementCheck whether the case is broken or crackedThe case is not broken or cracked
1.5.2Inconsistency of the centers of the shaftsAlign the centers of the shafts with each otherCheck the misalignment amountReport the misalignment amount to the coupling manufacturer and check whether it is within the allowable range
1.5.3The couplings spin freeFix the couplings with the shaftCheck whether the key or mounting screws are installed securelyThere is no relative sliding of the shaft connected with the output shaft by the couplings

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Defect of a load part or operating conditions (1.6)

Gearmotor, gearmotor with brake

Classification No.CauseCountermeasureInspection procedure and actionJudging criterion
1.6.1Selection error for the loadRe-selection and replacementCheck that the current value is within the rated current valueIt is equivalent to or below the rated current value written on the nameplate
1.6.2OverloadRemove the loadCheck that the current value is within the rated current valueIt is equivalent to or below the rated current value written on the nameplate
1.6.3The temperature sensor is workingRemove the loadCheck that the current value is within the rated current valueIt is equivalent to or below the rated current value written on the nameplate
1.6.4Excessive overhung loadRemove the loadCheck that it is equivalent to or less than the allowable O.H.L. valueIt is equivalent to or less than the allowable O.H.L. value written on the catalog
1.6.5Contact Positioning ControlRemoval of interferenceRemove interference if you hear the motor soundIt is equivalent to or below the rated current value written on the nameplate
1.6.6Too much tension of the belt and chainLoosen themCheck that the tension is equivalent to or less than the value recommended by the manufacturersReport the slack amount to the belt and chain manufacturers and check whether it is within the allowable range

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