Nissei Corporation

Q. 【FAQ0075】Explain the method to confirm whether there is nothing wrong with the rectifier.

【Product categories】Gearmotor with brakeGearmotors with Clutches and BrakesMID Series (0.1kW to 2.2kW)MINI Series (15W to 90W)Position control type (C1000)Speed control type (VF-nC3M)
【Contents categories】Abnormality/TroubleMaintenanceWiring


You can check it by “diode check” or “resistance measurement” with a tester (circuit tester).

Please see the following.



*Please check the rectifier alone (removed from the wiring).

*Please short-circuit the two blue leads when checking the rectifier.

*Though the rectifier mentioned above is “A200-D90 (A100-D45,”

 the lead color is the same for other rectifiers.

(1)Failure check method with digital tester “diode check”


Failure check of “A200-D90(A100-D45)”


Failure check of “A400-D180”


Failure check of “A100-D90”


(2)Failure check method with analog tester “resistance measurement”


Failure check of “A200-D90(A100-D45)” and “A400-D180”


Failure check of “A100-D90”


(3) Related information – Rectifier output voltage (reference value)


*Note: The measured voltage value varies according to the measuring machine.

     The above figure is just for reference.

Contact us

Product name search