This means that it might not be safe, feasible, or efficient to operate a 460V 3-phase 60Hz motor using a 380V 3-phase 50Hz supply.
Here are the key considerations:
Voltage Difference
The motor is expected to run on 460V, but the electrical supply shall only be 380V which means that it is 17% lower. This could lead to underperformance, reduced torque, overheating due to in increase in current draw as it is apparent from above figures.
Frequency Difference
From this it becomes apparent that the speed of the motor is directly related to the value of supply frequency.
Such reduction in speed from 60Hz to 50Hz caused the fan motor to pull reduced current, and run at a slower speed (at about 83% its rated speed).
This has an impact on the cooling system where the performance could be reduced due to the low speeds attained.
Thermal Management
Low voltage and frequency can make the current drawn by the motor higher in order to produce same power as before and this increases heat.
This could lead to damaging of the motor insulation and as result decreasing the lifespan of the motor insulation greatly.
Manufacturer’s Specifications
In this case, one should follow the advises and recommendations provided by the motor manufacturer. Such change is supported in some motors while in others it is not.
Thus, it is chemically possible to start and continue the motor in 380V 50Hz supply, but it is not sensible without analyzing the potential adverse effects and revising the motor’s efficiency to its desirable thermal capacity.
In certain applications, it would be more preferable to use a transformer or variable frequency drive (VFD) in order to achieve the motor’s rated voltage and frequency.
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