Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Step down transformers

Step down transformers

Step down transformers

My friend has taken a fridge freezer back from the States with him. Beautiful machine, Ice maker etc and he doesn't want to get rid of it. It is rated at 115Volts 60Hz. He has been told that the only step down transformer he can get operates at 50Hz. My understanding has always been that 50Hz is the rate at which the Current alternates. Can anyone tell me if this is going to cause any problems with the operation of the machine or with the transformer?

RE: Step down transformers

The compressor motor (and other motors) will run at 5/6 normal speed.  Unit may still work, but not at rated output or efficiency.  This depends on the speed-torque curve of the compressor.  

Have him look on the nameplate to see if it is listed as "60Hz" or "50/60Hz".

RE: Step down transformers

How new is the fridge?  Some of the very newest high-efficiency models have a VFD for the compressor, so incoming line frequency is not relavant.  Check to see if this is the case.

RE: Step down transformers

In Israel the line is 220v/50Hz.
I brought a fridge from the states and ran it on a trafo 110/220. its been like this for 20 years.
baruch 4z4rb.

RE: Step down transformers

I would recommend to use a step down transfomer 230V/96V.

The voltage has to be reduced according to the ratio of the frequencies: 96=115*50/60

A transformer with taps might be useful so that the voltage can be adjsuted so that the motor starts properly but doesn't overheat on the long run.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


White Paper - PLM and ERP: Their Respective Roles in Modern Manufacturing
Leading manufacturers are aligning their people, processes, and tools from initial product ideation through to field service. They do so by providing access to product and enterprise data in the context of each person’s domain expertise. However, it can be complicated and costly to unite engineering with the factory and supply chain. Download Now
White Paper - Medical Device Design Control
Medical device product development is a highly integrated and regulated process. Implementation of a requirements tracking solution requires attention to a variety of nuanced topics. When presented with the task of tracking the many concept relationships in a project of this type, the initial software solution of choice tends to be a two-dimensional text systems. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close