208 230 vac

208 230 vac DEFAULT

Can 230V 3phase motor running on 208V 3phase?

To properly answer this question, we would need to have the actual motor ratings and operating load conditions, I.e.; nameplate voltage, frequency, amperes & service factor. Actual operating conditions would be; operating voltage, operating amperage & type loading (constant, cyclic/constant etc.). Generally, a motor with a nameplate rating of 3ph 230 volts can operate as low as 3ph 207 (+/-10%) system volts. However, if the operating conditions are a heavy load at or near nameplate full load rating, operation at 3-phase 208 volts could result in higher operating amperes, resulting in higher operating temperature. Higher operating temperature will result in a shorter life expectancy.
AC Motor
Even though the system voltage of 3 phase 208 is within the -10% rating of the three phase 230 v motor, the 208 is allowed to vary to -10% or 187 volts -- and the motor will not work at that level. If you can't get a 208 rated motor (or one which has multiple voltage ratings like 208-230, which are made) -- then you're better off looking to insert transformation to get back up to 230 volts; this could be a 2-winding transformer of 208-230 volts or else you could get three (3) buck-boost transformers (2 winding units configured as auto-transformers) to get you there.

This motor was built to be used on 240V system. Torque is current X flux. Flux is reduced to 208/240=200/230=86.7%. The load torque demand is the same at the same speed, so the current will adjust itself at 115% of what was planned to be pulled by the load originally. If the motor has a Service factor of 1.15, everything is fine, which is usually the case.
On the other end, reducing the voltage drop might solve the problem if the following assumption is considered acceptable.

Normally, designer in a correct mind specify a motor to work at around 90% or less of the motor capacity. Under this assumption, the motor could be overloaded by 90%/86.7%=1.038. Then, we can expect the motor to be right at nominal current if the voltage drop in the cable is very small, and the motor is fed at 3phase 208v. Then the current would be 90%/(208/230)=99.5% I rated.

Another concern is the motor appears to be for a 50Hz three phase power supply, but the power supply on site could be at 60Hz 208v, so we must take that into consideration, too. At 60Hz, the motor will run at 20% higher speed than it would at 50Hz, so it may require a further 20% increase in voltage.

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Sours: http://www.gohz.com/can-230v-3phase-motor-running-on-208v-3phase

Author Topic: what does 208~230/460V mean for a 3 phase motor?  (Read 1245 times)

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T

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Just like the topic says can 208/230v run off 220v/240v?

We have a residential home that for some reason is 3 phase, 110/208v.

It is being changed to standard residential voltage of 220. The AC and other appliances are rated for 208/230. Will there be a problem with this?



Shake n Bake

L

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Most of the time no problem. SOME electronic stuff can be a problem,(control voltage xformers). Check the taps on motor loads(fans,A/C)Household stuff should be fine. Rod


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You seem to have your voltages all confused.
1) There is no such thing as 220/240.
2)There is no such thing as 3Ø 110/208
3) There is no 220 in the US.

Nominal system voltages are 120, 208, & 240.
120/208 or 120/240.

230 volt motors are designed to run on 240.
460 volt motors are designed to run on 480
208/230 volt motors are designed for use with 208 or 240 volt supplies.

[This message has been edited by electure (edited 11-20-2006).]


S

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If a motor is three phase 208 there is no way your going to get it to work on 240 single phase.I believe this is the only problem you would encounter..motors. If they are 3 phase they can't be used at all on a 120/240 system, unless u have a phase converter. But it would be cheaper to buy a motor.


T

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Yup I did have my voltages messed up. Thanks for the correction. (I always hear 220 ovens, 220 ac, 220 breaker, etc. confused me i guess.) "220, 240.. whatever it takes." [Linked Image]

Skip, there are no 3 phase motors. All are single phase. So that will work out. I have never seen residential 3 phase before. Kinda weird.

Thanks for the help.


[This message has been edited by Trick440 (edited 11-20-2006).]


Shake n Bake

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Electure, thanks for that clarification. I usually let it pass, the general population probably keep referring to it as 110/220, but in my experience, the only 110 I have encountered was in a tiny 7.2 KV:110 pot(1 kVA) feeding a control circuit operating a 12,470 capacitor bank.

Most of the time I run into high voltages i.e., 123-127 volts. I get to sell a lot of 130 volt bulbs


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Cat Servant

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Let's not confuse what the PoCo provides with what is stamped on the nameplate.

I have seen all sorts of markings on equipment. Some of this is a creation of testing methods.

For example, NEMA standards expect motoes to work within 10% of the nameplate markings. So-
- a motor marked "240" would be tested at 216 volts as well as 264 volts;
- a motor markes "208" wuld be tested at 187 and 229 volts;
- a motor marked "208/240" would be tested over the entire range of 187 to 264 volts (with re-wiring as appropriate); and...

- a motor marked "220" would be tested at 198 and 242 volts.

I set the last one apart, because by having such a rating, a motor could be made to serve both 208 and 240 volt systems, without the need for multiple taps.

In short, the nameplate rating is completely separate from the nominal voltages of the power grid.


S

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120V at the service can easily become 110V at the equipment once its fully energized. It would still be called "120V" though.

In Europe you run into the same thing, with panels being marked 400V or 380V despite the two being essentially the same thing.

[This message has been edited by SteveFehr (edited 11-23-2006).]


T

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That's a slightly different thing, they raised the nominal grid voltage from 220/380V to 230/400V, each +/-10% tolerance.
Some people say old 380V motors tend to burn up if they're connected to a new transformer that provides a higher voltage.


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Almost all of the motors we hook up out where I work are 9 or 12 lead, 230/460V 3phase... Although unless it's way off in some corner of the lease, the 480V network tends to run about 492V phase to phase, ungrounded delta.We've never had a problem with motors biting the dust that I've seen. (Largest motor I've connected was 250 HP. @ 1400 rpm. The 800A MCC rattled louder than that motor on startup [Linked Image])
Controls and buildings feed from "PanelTrans" that output 120/240V single phase.. We usually put these a tap lower on the primary connection and get a nice 121/243V output. [Linked Image]


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Sours: https://www.electrical-contractor.net/forums/ubbthreads.php/topics/72158/208-230v-can-run-off-240.html
How is 208 volts different than 230/240 volts?

A 208V rated motor should not be run on 240V, nor should a 230V rated motor be run on 208V, motors rated 115/200-230V or 115/208-230V are fine either way, older 3Ø motors rated 220/440V will be fine on either a 208 or 240volt supply when connected for lower voltage.


Click to see full answer.

In this regard, can I use a 230 volt motor on 208?

Generally, a motor with a nameplate rating of 3ph 230 volts can operate as low as 3ph 207 (+/-10%) system volts. Even though the system voltage of 3 phase 208 is within the -10% rating of the three phase 230 v motor, the 208 is allowed to vary to -10% or 187 volts -- and the motor will not work at that level.

Subsequently, question is, can you run a 220v motor on 208v? 220-230-240 (depends on utility) is the standard nominal 1-phase voltage across both legs of the line (120 nominal being the voltage from either leg to neutral). Most devices designed for 220 will run on 208 and in shops all over the place this is commonly done.

Likewise, people ask, is 208v the same as 230v?

In NA, the terms 220V, 230V, and 240V all refer to the same system voltage level. However, 208V refers to a different system voltage level. With electrical loads, the voltage will drop, hence the common reference to voltages below 120 and 240, such as 110, 115, 220, and 230.

Can you run 240v equipment on 208v?

If the device's nameplate states that it can run at 208v (in addition to say 220v or 240v), you are fine. Sometimes the nameplate will state 208-240v as acceptable voltage ranges. Most modern devices can support this, but you must check the nameplate of each device to be powered.

Sours: https://everythingwhat.com/can-you-run-a-230v-motor-on-208v

Vac 208 230

Question

What is the difference between 208, 220, 230, and 240 VAC systems?

Answer

In North America, the terms 220V, 230V, and 240V all refer to the same system voltage level. However, 208V refers to a different system voltage level.

In North America, the utility companies are required to deliver split phase 240VAC for residential use. That is two 120VAC (+/- 5 %) legs. With electrical loads, the voltage will drop, hence the common reference to voltages below 120 and 240, such as 110, 115, 220, and 230.
    Very Important: When the drive is hooked up for single phase operation (it is a slight misnomer) L1 has a 120VAC hot and L3 has a 120VAC hot (of opposite polarity), for a total of 240VAC. The manual states that a neutral is used. However, the neutral is only used with European single phase 220 on a single leg.


The 208VAC system is not the same as 240VAC. It uses a "Y" style transformer with a neutral, and will yield 208VAC between two phases and 120VAC from hot to neutral.

We do not recommend using a corner grounded or midpoint tap grounded "delta" secondary style transformer. The phases are not all balanced; one phase is always tied to ground. The voltage mismatch can negatively influence the drive's performance.



FAQ Subcategory: None

This item was last updated on 02-17-2021
Document ID: 834


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Sours: https://support.automationdirect.com/faq/showfaq.php?id=834
3 Phase 208 230V condenser fan motor change out

Whats the difference between 208v and 240v?

The difference between 208V three phase, and 240V single phase, is how the voltage is derived. 240V single phase is obtained by taking a single leg of three-phase power. 208V three phase is obtained by taking two legs of three-phase power.

Click to see full answer.


Subsequently, one may also ask, can you use 208 volts or 240 volts?

"220" is what the unqualified use to describe 240 volt circuits. 208 can only be obtained from a 3-phase wye system. 240 volts can be obtained from either a 120/240 residential system or a 240 volt 3-phase delta system. 208 is from a 3 phase system and 240 can be from a single phase or a 3 phase system.

Also, what is 208 volts used for? -208 volts is type of 4-wire 3 phase with 3 Hot wires and a Neutral used for commercial applications, or 2-wire single-phase with 2 Hot wires, or a 2-wire single-phase with 1 Hot and 1 Neutral wire, depending on the electric service delivered to building.

Also to know is, is 208v the same as 220v?

In NA, the terms 220V, 230V, and 240V all refer to the same system voltage level. However, 208V refers to a different system voltage level. With electrical loads, the voltage will drop, hence the common reference to voltages below 120 and 240, such as 110, 115, 220, and 230.

Is 208v single phase?

When using 120/208V single phase, you will use any two of those same three hot conductors, with the two waveforms peaking 120 degrees apart from each other. When one waveform is at its peak, measuring 120V, the other is only part of way through its cycle, measuring only 88V. The sum of the two is 208V.

Sours: https://askinglot.com/whats-the-difference-between-208v-and-240v

Now discussing:

Thread: Minimum incoming voltage?

Compressor says 208-230 1PH.
Voltage drops as low as 198 on start up.

My question is would we call 208 +/- 10% good? Or is 208 the MINIMUM voltage?

I stumbled across this from a motor repair company's website...

"Some commercial customers have converted their building services from 240 volts 3-wire to 208Y/120 volts 4-wire. Seeing nameplates on equipment (especially HVAC) reading “208- 230” or “208/230” volts, they’ve assumed “no problem.” When motor failures then occurred, the complaint was “low voltage.” What’s the story?

...

Standard motors are designed and nameplated “230” (or 230/460) volts. That means the minimum permissible terminal voltage (not back at the controller, or service entrance) is 90% of 230, or 207 volts.

...

But suppose the same motor is connected to a “208 volt” system. The ANSI standard then allows minimum service entrance voltage of 191; 184 is permitted at the motor. Those values are well below the 207 volt level. That forces the motor current way up, so that the motor is likely to overheat, and is no longer warranted for normal performance or life expectancy. So what’s the meaning of equipment nameplates reading “208-230” or “208/230” volts? No such markings appear in any standard. All they mean, in commercial practice, is that the basic motor design (most often made for 230 volts) is satisfactory at a terminal voltage of 208 – no less. That’s not the same as saying “OK for use on a 208 volt system,” where supply voltage can dip well below what the motor will tolerate."

Sours: https://hvac-talk.com/vbb/


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