I Have Y-delta Starter I Am Working On. The 2m Contactor Is Bad,the Control Voltage For This Contactor Is Fed Through A Circuit Board Which Then Delivers It To The Contactors Coil And It Pulls In. The Original Circuit Board Was Rated For 120/60hz. I Was Sent An Identical Contactor With The Exception Of The Rated Voltage Of The Board, The New One Is Rated 110/50 Hz. Ive Been Told By Several People That This Is Not A Problem. Im Scepticle!!! Any Advice Or Thoughts Would Be Appreciated.
50 hz vs 60hz
- Thread starter siemens
- Start date
- Status
- Location
- Wisconsin
- Occupation
- PE (Retired) - Power Systems
It will probably work.
Your circuit board is probably some type of AC-DC convertor (it is not unusual to see big starters with DC coils) although it could be a type of "interposing relay" instead.
Your circuit board is probably some type of AC-DC convertor (it is not unusual to see big starters with DC coils) although it could be a type of "interposing relay" instead.
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
Get it in writing from the supplier!siemens said:
dbuckley
Senior Member
- Location
- Canterbury, New Zealand
Good advice.
If the manf has seen fit to add frequency to the specs, and espeically such an unusual combination of 110V at 50Hz, you best get some paper.
If the manf has seen fit to add frequency to the specs, and espeically such an unusual combination of 110V at 50Hz, you best get some paper.
ELA
Senior Member
- Occupation
- Electrical Test Engineer
Check to see if the manufacturer offers both options for coils. If so do not mix them.
We shipped a lot of equipment with different coils 60 hz (USA) and 50hz (Europe). In one instance they got mixed up and it caused the coils to fail prematurely.
They may work one way better than the other but if the manufacturer offers both it is unlikely they would recommend mixing them.
We shipped a lot of equipment with different coils 60 hz (USA) and 50hz (Europe). In one instance they got mixed up and it caused the coils to fail prematurely.
They may work one way better than the other but if the manufacturer offers both it is unlikely they would recommend mixing them.
GeorgeB
ElectroHydraulics engineer (retired)
- Location
- Greenville SC
- Occupation
- Retired
I'm in the hydraulics industry; most, but not all, coils for solenoids (contactors frequently use identical solenoids and coils) are dual rated for 98-115/50, 110-130/60. Occasionally, a manufacturer will make a 50Hz, 60Hz, and 50/60Hz coil, optimizing the single frequency.siemens said:
The other comments that it is not optimum are true, but to truly optimize, the voltage needs to be constant within 2 or 3%. I'm 99% sure that you would have no trouble with it, but the suggestion to get an "in writing" ok from the manufacturer is best.
cateqx
Member
- Location
- san diego ca
electric contractor_ ca
electric contractor_ ca
i was reading about your post
50 and 60 hz
i do have experience in the industry, as a maintenance electrician for many years .
most of all electric equipment/ devices such as ; coils starters , solenoides , motors, will work with no problems either at 50 or 60 Hz
It willbe a sligthy variation wich won't afect its performnace
just to give you more information . check at name plate of some electric equipement, what you're going to find is a chart with the voltaje and amperage at both 50/60 Hz
electric contractor_ ca
i was reading about your post
50 and 60 hz
i do have experience in the industry, as a maintenance electrician for many years .
most of all electric equipment/ devices such as ; coils starters , solenoides , motors, will work with no problems either at 50 or 60 Hz
It willbe a sligthy variation wich won't afect its performnace
just to give you more information . check at name plate of some electric equipement, what you're going to find is a chart with the voltaje and amperage at both 50/60 Hz
ELA
Senior Member
- Occupation
- Electrical Test Engineer
Some manufacturers do better than others with coil voltages. Some have very tight tolerances on the voltage/freq. they can run on.
I revisited the problem we had with our coils ( on Square D ,3 -phase contactors) a few years back. The coils were rated for 115-120V at 60hz.
In the application someone assumed that since the coil said 120V 60Hz that it would also be good at 120V 50Hz and it was not. When run on 120V 50Hz too much current flows and it overheated over time.
When researched we found they were dual rated but for only 95V @ 50hz.
The manufacturer did not publish that fine detail!
When installed at 120V 50hz they overheated.
Since inductive reactance would go up with frequency it makes sense that dual rated coils could have different voltage ranges as they did in this case.
Of course if a DC coil with a ac/dc converter is used things are different and they are likely to operate over the same voltage range at either 50 or 60hz.
The point being that assuming is never good.
I revisited the problem we had with our coils ( on Square D ,3 -phase contactors) a few years back. The coils were rated for 115-120V at 60hz.
In the application someone assumed that since the coil said 120V 60Hz that it would also be good at 120V 50Hz and it was not. When run on 120V 50Hz too much current flows and it overheated over time.
When researched we found they were dual rated but for only 95V @ 50hz.
The manufacturer did not publish that fine detail!
When installed at 120V 50hz they overheated.
Since inductive reactance would go up with frequency it makes sense that dual rated coils could have different voltage ranges as they did in this case.
Of course if a DC coil with a ac/dc converter is used things are different and they are likely to operate over the same voltage range at either 50 or 60hz.
The point being that assuming is never good.
- Location
- San Francisco Bay Area, CA, USA
- Occupation
- Electrical Engineer
I work for Siemens.
Assuming this is a large contactor, size S6 or greater, it is indeed a little switch mode power supply board and it feeds a PWM signal to the coil. So you can feed it just about anything. 40 to 60Hz AC, even DC if you have to! The voltage tolerance is also extra wide: 70% to 125% of nominal rated voltage. So in your case, 84 to 150V, AC or DC.
Assuming this is a large contactor, size S6 or greater, it is indeed a little switch mode power supply board and it feeds a PWM signal to the coil. So you can feed it just about anything. 40 to 60Hz AC, even DC if you have to! The voltage tolerance is also extra wide: 70% to 125% of nominal rated voltage. So in your case, 84 to 150V, AC or DC.
- Status