who could you relay on?

lila1

I have been through the mill for a number of years healthwise and thankfully my oh has been there for me.
Just the other day my cousin was praising him to the rooftops for being there for me when times were rough.
I found this strange but she went on to say that if it was her she dosen't think her oh could cope and she would probably end up in a nursing home.
I could not believe what I was hearing but she seemed sure of what she was saying. I know in my own situation if the shoe was on the other foot I would do every thing in my power for oh as he has done for me

Sh1tbag OToole

Relays, an old but trusty and reliable, useful technology. Ideally suited to many applications

NotCominBack

Usain Bolt

Lord Riverside

Rule no. 1 in this world. Don't trust anyone, never mind rely on them.

The_Valeyard

The TDRS from Nasa does a good job, not sure if Sky uses it or which ever system the have is okay.

316

I can relay to the aa

indioblack

Lord Riverside wrote: »

Rule no. 1 in this world. Don't trust anyone, never mind rely on them.

A sad truth - or maybe not - maybe just a fundamental law of existence.
Good post - sadly.

Fuzzy Clam

Laying on someone once is bad enough. Relaying gets messy.

wil

Myself, sometimes

DEFTLEFTHAND

You find out who your real friends are in such situations.

Tony Beetroot

Summary?

Fuzzy Clam

Keplar240B wrote: »

Your application determines what you want to use. This means you need an understanding of the design and characteristics of different relay types, and your loads.

First, I will describe a brutal application where I applied a P&B KUP 11D15 24 VDC coil relay. This application has been in a substantial number of machines in automotive production over the last 40 years. The relays need to be replaced periodically. A good time frame is 3 months, but some have worked for a year. The cycle rate on some may be 3 to 4 times per 24 seconds, or about 6 to 8 per minute.

This relay has contacts rated at 10 A AC and uses silver-cadmium contacts. These contacts are very poor at low voltages, but at 120 V provide better durability than plain silver. In my application I paralleled the DPDT contacts, and the contacts were used as a SPST relay.

This relay switches a highly inductive load fed from DC at 110 V. The steady state current is slightly over 1 A. There is an RC snubber across the load. Our goal was the shortest drop out time of the electromagnetic clutch. Thus, a shunt diode across the load was not feasible.

The failure mode is unidirectional transfer of contact material from one contact to the other. One advantage of not doing the following to lengthen the life was that this gave the plant electricians something to do.

To lengthen the life a second relay could have been added that during the off state of this switching relay the second relay would reverse the direction of current that would flow thru the switching relay.

What happens when switching DC is that on average (meaning always) some contact material transfers from contact A to contact B. This produces a conical cavity in contact A and a conical mound on contact B.

Change to an AC current thru the contact and on average for a randomly operated relay or switch there will be metal flow in both directions.

In the old days when breaker points were switching the DC to an ignition coil there was this one way transfer of contact material.

Filed May 17, 1943 is patent http://www.freepatentsonline.com/2402543.pdf by Henry Ford and Emil Zoerlein for a distributor design that automatically reversed current direction each cycle. I do not believe it was ever put into production. In the early 50s Ford Motor developed a breaker point set with a hole in the center of the contact that grew the mound. This somewhat increased breaker life.

An electromechanical relay that switches moderate voltage AC at a relatively low current will probably fail of mechanical fatigue. At high currents it will probably be contact failure. Contact size and cycle life will determine the relay sized. Lots of AB machine tool relays, back in the days of relay logic, probably had cycle life in the 10,000,000 range. One cycle every 12 seconds is 2,628,000 cycles per year for 24 hours per day. I suspect a lot of machine control panels had some relays that were never changed (repaired or replaced) in 10 years, but not all panels ran 24 hours 365 days per year. However, some relays would operate more that once per 12 second machine cycle.

Now to SSRs. For your type of application almost all will have optical or other high resistance isolation between the control signal and the output switch. The output switch is a transistor or equivalent device for DC circuits. Any appropriate solid state device can be the output power switch for AC loads. The amount of leakage current thru this output switch will vary, but is many times significant, and results from the switch device itself, or shunt circuitry around the switch.

Major failures of solid state switches will result from excessive current, or overvoltage. If operated within reasonable limits the cycle life can be very great compared to an electromechanical relay. Also SSRs may be operated rapidly. Some normally do not turn off when commanded, but wait until the next current zero crossing of the load current.

You need to learn more about the various devices and evaluate the requirements of the load.

Whew! All that and you didnt read the question.
Not what type of relay........
Always read the question.

NachoBusiness

lila1 wrote: »

I could not believe what I was hearing but she seemed sure of what she was saying.

You'd be surprised how some people (friends, family and significant others) haven't got the back bone to be there for loved ones should they fall behind with respect to their health. Self preservation is a very high priority for many people, not that such people would ever admit it. Indeed, people like that would actually have little or no self awareness in that regard and in fact, would even complain about others that displayed such qualities (seen and heard 'em do it) even though they themselves have those narcissistic qualities in spades.

Glad your OH isn't one of them. As indeed, you don't seem to be either.

316

Fuzzy Clam wrote: »

Whew! All that and you didnt read the question.
Not what type of relay........
Always read the question.

good point

lazybones32

lila1 wrote: »

I have been through the mill for a number of years healthwise and ...

I know a woman whose husband was knocked down and paralyzed. She stayed with him in hospital and at night, she told me, people were sobbing; some because of their condition and some because their spouse left them because they could not deal with a paralyzed husband. It sounds cold - and it is - but some people cannot cope with it. This woman suffered a great deal and helps many other people who find themselves in a situation like hers and her deceased husband, so I don't doubt that she told me the truth.

Her husband was knocked down by a car driving under 30 mph.

endacl

Lord Riverside wrote: »

Rule no. 1 in this world. Don't trust anyone, never mind rely on them.

Your world sounds crap.

The Randy Riverbeast

My ex wife.

The police never looked under the patio.

gossamer

DEFTLEFTHAND wrote: »

You find out who your real friends are in such situations.

Never a truer word spoken.

You would be shocked by the people who let you down when you need them the most, often the one's we expect the most comfort from. Heartbreaking really, eye opening nonetheless.

NachoBusiness

lazybones32 wrote: »

It sounds cold - and it is - but some people cannot cope with it.

That's true and I'd say Dana Reeve was a good example of someone that stood by a spouse after a serious life altering accident .Some might say it was somewhat easier for her as they had finances available to them which the average person would not, but I don't think anyone, after having watched even one interview with her, would ever doubt that she would been just as supportive of a loved one had they not had access to the same means. She may also be a good example of someone that perhaps took on more than she was capable of as within a year of Christopher's death she was diagnosed with cancer and died just over six months later herself.

So yeah, without doubt looking after a loved one can take its toll, but I would still question the depth of love someone has for a person when they don't even try to. I have known people like that. It's one thing not being able to cope after having done your best and sought help when and where it was available, but quite another, imo, to just be cold and talking about how they wouldn't be able to cope despite them not even trying to, especially on an emotional level. They say life events makes a person who they, but they can also reveal who a person is too.

Lord Riverside

endacl wrote: »

Your world sounds crap.

You mean the world where people know not to trust you. Crap for you perhaps.

Very good for me.

r93kaey5p2izun

In terms of relying on someone if I was physically unable to look after myself due to injury or illness, then nobody. I guess I would have to go to a nursing home of some sort. I could rely on my mother in most other situations but not 100%.

Hannibal Smith

Lord Riverside wrote: »

Rule no. 1 in this world. Don't trust anyone, never mind rely on them.

This for me too. You cant rely on anyone...certainly not 100%. Plus i would more than likely tell the husband to not look after me if it was a serious life altering thing.

ytpe2r5bxkn0c1

Lord Riverside wrote: »

Rule no. 1 in this world. Don't trust anyone, never mind rely on them.

What a sad view of life and humanity.

My wife, children, siblings, and many friends have proven themselves as trustworthy and reliable when it was called for.

Lord Riverside

Priscilla Beautiful Weight wrote: »

What a sad view of life and humanity.

Actually once you learn that, life becomes very happy

ytpe2r5bxkn0c1

Lord Riverside wrote: »

Actually once you learn that, life becomes very happy

But it's a very false perception. I'm over 70 and one thing I have learned in life is that there are people who most definitely are trustworthy and reliable. My life is full and happy because family and friends all help support and assist each other. It's called love.

Lord Riverside

Priscilla Beautiful Weight wrote: »

But it's a very false perception. I'm over 70 and one thing I have learned in life is that there are people who most definitely are trustworthy and reliable. My life is full and happy because family and friends all help support and assist each other. It's called love.

Firstly I wouldn’t trust anything you've just claimed.
Secondly, very few get to live such a charmed life. That's the random lotto of life.
I've learned more experiencing both sides of life.
I help and support people, but I don't trust or rely on anyone.

“Love all, trust a few, do wrong to none.” - William Shakespere.

Massimo Cassagrande

After long and bitter experience, fcuk all no one. It's a good general rule.

ytpe2r5bxkn0c1

Lord Riverside wrote: »

Firstly I wouldn’t trust anything you've just claimed.
Secondly, very few get to live such a charmed life. That's the random lotto of life.
I've learned more experiencing both sides of life.
I help and support people, but I don't trust or rely on anyone.

“Love all, trust a few, do wrong to none.” - William Shakespere.

As long as there are the few in your life that's all that matters.

As for not trusting anything I've said; you have no right to not trust me. You have no authority to base that on. I do not lie. I do not claim anything but the truth. The question was asked and I answered it openly and honestly. You don't know me, or those I know can be relied on, so please don't try to paint my world with your imagined view of it. I know it for what it is. You are only making unfounded suppositions.

At that, I out.

Lord Riverside

Priscilla Beautiful Weight wrote: »

As long as there are the few in your life that's all that matters.

As for not trusting anything I've said; you have no right to not trust me. You have no authority to base that on. I do not lie. I do not claim anything but the truth. The question was asked and I answered it openly and honestly. You don't know me, or those I know can be relied on, so please don't try to paint my world with your imagined view of it. I know it for what it is. You are only making unfounded suppositions.

At that, I out.

I'll decide who I trust. Trust is earned, not demanded.

Mehaffey1

Whoever said Usain Bolt damn you that was my first thought as I read the title of this read.

In reality I have my girlfriend, my best friend and my employer to rely on in an emergency, that's it, scary when you acknowledge it nonetheless.

Kev W

Lord Riverside wrote: »

I'll decide who I trust. Trust is earned, not demanded.

You say that, but how can we trust you?

Lord Riverside

Kev W wrote: »

You say that, but how can we trust you?

Exactly, you shouldn't. And unlike the more suspicious, I haven't demanded you do.
I know that I can be trusted, but only I can know that. You can't.