Frequecy Conversion

To start off with, check your numbers. Maybe it is just a typo, but 415V 60Hz is not a standard voltage anywhere I know of. 415V 50Hz is; maybe that's what you meant, because you mention speed issues and if they are both 60Hz, there is no speed issue.

So assuming you are concerned about using 50Hz motors on a 60Hz system, then yes, speed will be 20% higher. If that is a problem for you, you can use VFDs and set them up to provide the proper output voltage and frequency for your motors.

I caution you on the hoist however. VFDs on hoists are tricky to implement and require not only a very specialized VFD with encoder feedback, but also someone with specific experience in it. The consequences of doing something wrong can be deadly if it drops a load.

You may want to just deal with the speed issue without using VFDs and learn to use it that way, at least on the hoist. But also, check out how the brake works on your hoist. If powered by the line voltage, it may need to be reconfigured for the 60Hz or the coils will fry.

The coils may not fry if the impedance is such that the power level is the same or less than that at 50 Hz. 415²/Z₅₀ < 480²/Z₆₀.

You are right JRaef, it is indeed a typo and it should have read 415V/50Hz. Thanks for your comments; you are right about the hoist and this has been one of my biggest worries, especially when the incident can have legal impliactions

JRaef is giving you good advice.

About the only legal thing you can do here is change the nature of the electrical source feeding the lifting device.

All lifting devices are put through considerable product certification trials before they are granted certification. Any modifications done to the unit will void its certification. Modifications must be approved by the manufacturer and the AHJ in the region in question to keep it legal for use in most jurisdictions.

YOU are a real Canadian,,,,,,,,sorry,,,I am a dreamer,joker

What is name plate data on the motors? If they are same as supply you are getting or it is different?

Mfrs. have designed equipment for particular electric supply if you are not getting same then you have to change the electric supply or the equipment to suit your supply. If you change frequency of the motor it will run at faster speed and may damage your gearbox etc.