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Kimie
Member
Malaysia - Member - Kimie

Join Date: Feb 2009
Location: Terengganu,Malaysia
Posts: 9

Condenser and Evaporator Fan Motor Replacement

12/15/2009 12:37 AM

Hi all. I'm doing Air Cond installation project at platform that supplied electrical 480v/3ph/60Hz. The unit I have installed is 415v/3ph/50Hz.

I use the stepdown transformer to decrease the voltage (transformer input 480v/60Hz - transformer output 415v/60Hz)

Since the cond & evap motor is 50Hz, during T&C current drawn double than name plate (Nameplate 8A and during T&C 11A for evap motor). I suspected that the cycle is different as platform 60Hz and my unit is 50Hz.

So I decide to replace the cond & evap motor but I found difficulties to find the motor spec as below. Anyone can consult for this problem? Or could give me the motor supplier to get the motor as per the specification or other brand but similar to the spec? TQ

Cond motor:

HAT 081 – HAT – R

580W / 3Φ / 8P

380-415V / 60Hz / Class: E

0903150133

Headline electric co.LTD

Evap motor:

KHF 2T4703

240V / 60Hz / 4.74A / 600Wout

1300/1200/1100rpm

CAP 15µF / 440VAC

TORIN P/N : 40P5134 – 600SA

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Aldego
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Join Date: May 2009
Location: Centurion, South Africa
Posts: 87
Good Answers: 5
#1

Re: Condenser and evaporator fan motor replacement

12/15/2009 2:29 AM

A 415v/3ph/50Hz motor will operate without any problems on a 480v/3ph/60Hz supply and you do not have to make any changes. You just need to set the protection according to the 60Hz requirements..See previous threads in this forum..

Stepping the supply down to 415v/50Hz will definitely create problems.

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Kimie
Member
Malaysia - Member - Kimie

Join Date: Feb 2009
Location: Terengganu,Malaysia
Posts: 9
#2
In reply to #1

Re: Condenser and evaporator fan motor replacement

12/15/2009 4:41 AM

Dear Aldego,

Actually how to set the protection according to 60Hz?

Why stepping the supply down to 415v/50Hz will create problem?

I got confused right now...could you pls explain?

TQ

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Aldego
Commentator

Join Date: May 2009
Location: Centurion, South Africa
Posts: 87
Good Answers: 5
#3
In reply to #2

Re: Condenser and evaporator fan motor replacement

12/15/2009 5:06 AM

Sorry typo error should be: stepping down to 415v/60Hz

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Anonymous Poster
#7
In reply to #3

Re: Condenser and evaporator fan motor replacement

12/15/2009 8:10 PM

Why stepping down to 415v/60Hz create problem. I like to learn more from u.
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PWSlack
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 32175
Good Answers: 839
#4

Re: Condenser and evaporator fan motor replacement

12/15/2009 8:13 AM

What about a variable frequency drive?

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Anonymous Poster
#6
In reply to #4

Re: Condenser and evaporator fan motor replacement

12/15/2009 8:08 PM

Does VFD could be used? Could u explain more about VFD application? Does it applicable to convert 60 - 50Hz? How it works?tq
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Anonymous Poster
#5

Re: Condenser and evaporator fan motor replacement

12/15/2009 8:46 AM

http://www.torin.com.au/PDF/04_TorinDirectDriveBlowers.pdf
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Patrick Whowha
Power-User

Join Date: Nov 2009
Location: Nnewi,Anambra,Nigeria
Posts: 146
#8

Re: Condenser and Evaporator Fan Motor Replacement

12/16/2009 7:13 AM

Well u hv done some good job to stepdown the the voltage.But u still need to work on yr frequency to 50Hz.

We have frequency converters.They are driven by asynchronous motors or synchronous motors if speed is to be independent of load.With this frequencies can be increase and decreased from lower to higher values or vice versa.

If u decide to power yr load with 415/60Hz,it would work,but the inductive reactance of the motor will increase and thus increase yr current than normal current which may affect yr motor.And if u want to balance this up(ie keep motor current at normal),then u need to increase yr voltage correspondingly.Remember again that yr motor is rated only for 415 and not above.So this brings us back to using frequency converter again.

Pls always check yr source(supply) before buying equipment.

Patrick Whowha

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Users who posted comments:

Aldego (2); Anonymous Poster (3); Kimie (1); Patrick Whowha (1); PWSlack (1)

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