On Monday, August 29, 2016 at 5:46:21 PM UTC-5, Tony944 wrote:
"Ralph Mowery" wrote in message
k.net...

In article ,
says...


The hard start cap is only good for momentary contact. It's to be
disconnected as soon as the motor has achieved 'run' rpms. Otherwise,
you'd toast the cap. IE; it sends a surge of current to the start
windings to get the motor up and going, and within a few seconds, a
relay is supposed (in some) to kick it off the start cap/windings and
onto the run cap/run windings.

As I said though, hvac isn't my specialty and I fully admit I could
be wrong in how the cap is being used in this way.


Everyone seems to be dancing around the hard start capacitor.

It allows the motor to draw lots more current for a very short time to
get the motor up to speed faster. As the motor spins up it draws less
and less current. When it is at its rated speed , it will draw less
current .
As most fuses and breakers do not trip at the instant they reach their
marked current, but take some time to heat up and trip depending on how
much over the marked value the current is. By using the hard start kit
the current will be over the marked value by a good ammount, but it will
be short enough not to trip the breaker. Where without the kit it will
take the motor longer to get up to speed and the breaker will trip
during the longer slightly over loaded condition.

Think of it as how long you can hold your hand to a hot surface. You
can touch a very hot object for a very short time and not get burnt.
YOu can touch a cooler object longer before a burn.
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Again yes MOV are used in power supplies, but MOV came out about 30 years
ago
what was used before that time? There some Capacitors that are made for very
high-power in switching circuits like power station that can very easily
kill person
but I do not think that we are talking about those.
Electrolytic common definition in DC systems not necessarily in the AC
systems
and no commonly they do not get charge in AC systems as I said, they are use
limit current but 90 deg. out of phase to the AC line to start or run
motors, what
would be classification of running Capacitor which is on at all the time
when power
source is applied. You can also change power consumption by change the value
of capacitor. (Don't do it unless you know what you are doing)
Go back to DC: the DC voltage most not be able to pass through any capacitor
unless it is bad and is leaking through, but the CA will' because that is
what is should do.
Some of you guys can say whatever you want I am not here to squabble over
some stupidity.
So gents have nice day...


I've repaired industrial control discrete component loaded circuit boards from the early 1960's that had MOV's mounted on them. Those particular axial lead components were the size and shape of AA batteries. It was only circuit boards from some years later that I saw disk shaped MOV's. The MOV has been around longer than you may think. Some of them are huge. Look at the symbol for it used in electronic diagrams which closely resembles the early component shape but I feel it may be more a representation of it being a voltage dependent "resistor". ^_^

[8~{} Uncle Bored Monster