- Location
- San Francisco Bay Area, CA, USA
- Occupation
- Electrical Engineer
In another thread, (link) weressl said;
My purpose for all this quoting is because I did not want to further hijack that thread.
So my question for Mr. Weress; did that definition recently change? As of 2007, I had that the definition in IEEE 1566-2006 for ASD reads: "An interconnected combination of equipment that provides a means of adjusting the speed of a mechanical load coupled to a motor." That does not, to me anyway, specify AC or DC, or even mechanical vs electrical variability.
In several places they make references such as this; "This standard applies to a-c adjustable speed drive (ASD) systems ..." but in that sentence, they specifically start out by saying A-C, which delineates the term before it is used. So to that, I do concede that my statement that ASD in context to an AC motor doesn't preclude a mechanical Varidrive is apparently contrary to what IEEE is saying there. But that still doesn't look like an "official" definition, plus we have to remember, there is no "M" in IEEE, so why would they ever take mechanical devices into consideration? Am I missing something in another IEEE standard perhaps?
By the way, I also noticed that in the 2005 NEC, the term they use is "ASD" as well. But again, look at the context; National Electric Code; so they too would not be concerned for mechanical devices, and from the standpoint of an AC power distribution system, a DC drive has the same installation requirements as an AC drive. So for the purpose of this forum, being primarily a CODE related discussion, you may have a point. But I still think that for general use, I don't like using ASD because it is technically too vague.
I hope I'm not being disrespectful, I'm open to learning here because I have to do a lot of educating and I too like to use the correct terminology. Granted, IEEE is not the final word on this, but they do have clout.
This touched off a number of other side discussions about the "official" definition to which the following transpired:
My purpose for all this quoting is because I did not want to further hijack that thread.
So my question for Mr. Weress; did that definition recently change? As of 2007, I had that the definition in IEEE 1566-2006 for ASD reads: "An interconnected combination of equipment that provides a means of adjusting the speed of a mechanical load coupled to a motor." That does not, to me anyway, specify AC or DC, or even mechanical vs electrical variability.
In several places they make references such as this; "This standard applies to a-c adjustable speed drive (ASD) systems ..." but in that sentence, they specifically start out by saying A-C, which delineates the term before it is used. So to that, I do concede that my statement that ASD in context to an AC motor doesn't preclude a mechanical Varidrive is apparently contrary to what IEEE is saying there. But that still doesn't look like an "official" definition, plus we have to remember, there is no "M" in IEEE, so why would they ever take mechanical devices into consideration? Am I missing something in another IEEE standard perhaps?
By the way, I also noticed that in the 2005 NEC, the term they use is "ASD" as well. But again, look at the context; National Electric Code; so they too would not be concerned for mechanical devices, and from the standpoint of an AC power distribution system, a DC drive has the same installation requirements as an AC drive. So for the purpose of this forum, being primarily a CODE related discussion, you may have a point. But I still think that for general use, I don't like using ASD because it is technically too vague.
I hope I'm not being disrespectful, I'm open to learning here because I have to do a lot of educating and I too like to use the correct terminology. Granted, IEEE is not the final word on this, but they do have clout.
