I am planning to ship several high efficiency ac condensers to Asia.
The units that I am planning to ship are not produced in in that
area. The problem is that they are 208-230V/60/1phase. Of course the
electrical specs in Asia are 208-230V/50/1phase. I have spoken to
several electricians here in the US and have heard several different
opinions. The general concensus is that if I lower the the voltage
using a "bust and boost" transformer to around 200V, the system will
operate at lower cycles and thus lower my capacity. But is there any
risk to damaging the compressor? Does anyone know the actual impact
that operating these compressors at 50 hertz will have? Please help.
First off... I'd agree with others here that say "Talk to the motor
I've never seen a single phase 60 hz. motor operate successfully at 50
hz. There are good reasons why that I won't get into here.
However, just for reference... three phase motors will generally do OK
at 50 hz. Motor quality and temperature ratings, as well as performance
curves, vary quite a lot from one brand/model to another.
That all being said... here's the 'general' guidelines of what will
occur when you supply a 3 phase 60 hz. rated motor of any type at 50 hz.
1. Supply voltage should be 5/6 of the 60 hz. rated.. in this case (at
230 v... that would be ~191 volts and no higher).
2. Speed will be about 5/6 of rated. That COULD be a problem.. depending
on the application. Efficiency will not be reduced (probably) but
capacity certainly will be lower. Motor 'slip' will be considerably
less... and if the manufacturer allowed for that... OK. If not... you
might be in trouble.
3. Torque will be approximately the same. All performance curves (like
locked-rotor and breakdown torque will also be similar). Locked rotor
current will be approximately 5 percent less.
I did not read all the replies you got but some guys are correct
condenser fans you must reduce voltage by 10% the compressors
are usually rated and made that will operate at 60 & 50 cycles
perhaps at some reduced efficiency, the OEMs should be able
to gave you that info.
When you've got excellent product produced in the region made for the job.
Anyway - in all likelihood you'd only be shipping it back somewhere near
where the components were made anyway!
I believe Bitzer have a substantial manufacturing presence in Asia as does
Perhaps you should stick to exporting coolrooms to Alaska.
It looks to me that some of you guys still can not apprehend
50/60 cycle operating motors.
I have posted on 5/27 what you need to do , again 60 cycle motor
to run on 50 cycle service you must reduce voltage by 10%
otherwise motor will overheat and shut down or burn out,
I have done this three years in row for Mfg. in Italy I am tell
this from experience, compressors is no problem at least with
semihermatics Copland on others I can not say I don't know.
Since you're an expert and everyone else is a dip.
Then you would know thats not necessary unless you have the wrong
compressor spec'ed from Copeland.
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