Frequently Asked Questions

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Mechanical

On vertical mounting, is it okay to mount your electric motors both shaft up and down?


Yes. In general, electric motors up to and including 447T frame can be mounted vertically shaft up and down. Electric motors installed vertically must be protected from weather conditions, especially water penetration e.g. drip covers installed for shaft down outdoor operation. Larger electric motors are horizontal operation only. See individual product pages for details.




On Elektrim motors, are the fans UNI or bidirectional?


All NEMA motors are equipped with bidirectional fans.




Is it better to install a drive-end (DE) roller bearing on electric motors?


It depends on the electric motor application. A drive-end (DE) roller bearing is always preferred for belted drive electric motor applications. In direct coupling applications, always use ball bearing motors.




What kind of bearings do you use on your AC motors?


20 and 31 Series motors up to NEMA 286T/TS frame and equivalent metric up to and including IEC180L frames are equipped with double-shielded bearings greased for life. Larger electric motors have regreasable bearings. See individual product pages for details.




What kind of grease should I use to re-grease your bearings?


We typically use POLYREX® EM grease in our regreasable bearings. Please look to individual product manual for specific details and regreasing schedule.




Do I have to re-grease the bearings of a new electric motor?


It depends on how long the electric motor was stocked. Every AC motor with regreasable bearings which has been stocked for over 12 months has to be re-greased before usage.




How often should I re-grease electric motor bearings?


It depends on the electric motor’s RPM and usage. Regreasable bearings should be re-greased according to the recommendation in the manual for that particular electric motor.




Where is the junction box located on your Metric IEC motors?


Standard metric motors have junction boxes located on the top (F3/F0). IEC90,100,112 frames have an option to relocate the box for F1/F2 positions (conversion) from stock.




Should drain holes always be opened?


Drain holes should be opened at the motor's lowest point when an electric motor is operating in a wet, high humidity atmosphere or low temperature environment. This gives moisture a pathway out of the motor so that it doesn't become trapped inside, which could otherwise cause the electric motor to short over time.




What does IM B35 mean for Metric IEC motors?


It means that the motors are equipped with D-Flange and Feet. Other common descriptions are as follows: IM B5 = D-Flange without Feet, IM B3 = Footed, IM B14 = C-Flange without Feet, IM B34 = C-Face and Footed.




At what frame does the factory begin locking the shaft before shipment?


NEMA motors starting from 320T frame and Metric motors starting from IEC 200 frame have shafts locked prior to shipment. It should be removed from the shaft before energizing the motor.




Do your electric motors have removable feet?


We offer removable feet on our AC motors as follows: 20N series 324T frame and up; Metric 20M series up to IEC 160 frame. Metric IEC 90 - IEC 112 frame also have rotatable feet.




Do you offer brake motors with flanges?


Yes. NEMA and Metric Brake motors are offered with all the same flanges as our standard electric motors.




Can I convert your standard NEMA motor to F2 position?


All 31N and 32N motors can be converted to F2 position. 40N and 20N series motors up to 286T frame can be converted to F2 position. Rolled Steel and 580 frame motors are F1 only.




Do you offer D-Flange NEMA motors?


We offer D-Flanges for 31N series motors ranging from 143TD-449TD and 20N series motors ranging from 324TD - 447TD.




Do your motors have a threaded hole inside the end shaft?


NEMA 20N motors 320T up to 449T frame have a M20 threaded hole. All Metric iec motors have a threaded hole inside the end shaft according to IEC standard. See chart below.




When are blowers required on your electric motors?


Blowers will be required for all constant torque electric motor applications where the turn down ratio exceeds VFD capability of specific motor.





Electrical

Are your electric motors inverter rated?


Yes. All three phase (3PH) motors are inverter duty rated. See individual product pages for specific inverter duty ratings for each product group.




Are your NEMA motors suitable for Y/Delta and Part Winding starting?


Yes. In general, standard AC motors starting from 213T frame are suitable for Y/Delta starting at 460V. Electric motors up to 447T are suitable for Part Winding at 230V. See individual product pages for specific starting for each product group.




Can your NEMA motors run at 208V?


NEMA Motors up to 400 frame are suitable at 208V. The connection diagram is the same as 230V. Max amps at 208V are placed on the nameplate.




How do I change the motor rotation from CW to CCW and vice versa?


The direction of 3-phase motors can be changed by swapping any two power lines e.g. L1 with L2 or others. Changing the direction of single phase motors requires a different wiring diagram, which is included on the motor's nameplate.




Do you offer dual-rated motors for 60Hz / 50Hz?


All three phase (3PH) motors are dual rated for 60/50Hz on the standard nameplate, often with lower HP output at 50Hz. See individual product pages for specific rating information for each product group.




Do you offer 575V motors from stock?


Yes. NEMA 20N series motors up to 447T frame and Metric motors IEC132 and larger can be re-rated to 575V with nominal HP output from stock.




Do you offer motors with non-standard voltages and HP?


Many NEMA and metric motors can be re-rated for different voltages, HP and/or frequency based on application, duty cycle, ambient temperature and service factor required. Please contact us to discuss your special application requirements.




What brake type do you use on your Brake motors – DC or AC?


Our Brake motors are equipped with DC disc brake with a 460V AC rectifier placed inside the junction box. On request, the 460V AC rectifier can be replaced with a 230V AC rectifier.




Can I order a NEMA motor with a terminal board?


Yes. We offer NEMA motors with optional terminal boards.




Do you offer terminal boards on your Metric motors?


Yes. Elektrim Metric motors up to 112M frame are equipped with terminal boards as standard. Metric IEC motors starting from IEC132 have 12 leads (Double Delta / Delta connection diagram at 230/460V) and can be equipped with optional terminal board on request.




Do you offer AC motors with thermal sensors?


Explosion Proof, 20 and 40 Series motors starting from 320 frame (including Metric 200L and up) are equipped with thermistors in windings as standard. Other motors can be equipped with different thermal sensors as an option.




Must an inductor be used between electric motor and drive?


Any AC motor connected to an inverter drive. With power leads that exceed 100 ft., there should have an inductor between the motor and drive.




What kind of starter do you prefer for your AC motors?


We prefer starters that include a circuit breaker, contactor and overload. All starters should be sized according to National Electrical Code.




What are your electric motor windings made out of?


Stator windings are made out of copper. The rotor cage is made out of aluminum alloy.