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Search: Posts Made By: jraef
Forum: LIVE PLC Questions And Answers Today, 04:48 PM
Replies: 18
Views: 1,183
Posted By jraef
:doh:

:doh:
Forum: LIVE PLC Questions And Answers Today, 01:29 PM
Replies: 18
Views: 1,183
Posted By jraef
The problem with using NEMA enclosure ratings for...

The problem with using NEMA enclosure ratings for things going overseas is that they don't cross over as directly as some would have you think. I see people claiming IP65 as being equivalent to NEMA...
Forum: LIVE PLC Questions And Answers Today, 10:56 AM
Replies: 15
Views: 493
Posted By jraef
Just a minor word of caution on this; if the...

Just a minor word of caution on this; if the breaker is also providing control power, when you shunt trip it, you lose all indication as to what happened and uninformed operators will tend to...
Forum: LIVE PLC Questions And Answers Yesterday, 07:31 PM
Replies: 14
Views: 390
Posted By jraef
Here is the meat of the issue. This is from 2013,...

Here is the meat of the issue. This is from 2013, it is basically unchanged.
https://secureservercdn.net/198.71.233.179/t53.84d.myftpupload.com/wp-content/uploads/2013/10/NA_PLC_MktShare.jpg

...
Forum: LIVE PLC Questions And Answers Yesterday, 03:02 PM
Replies: 18
Views: 495
Posted By jraef
Most modern 24VDC switch mode power supplies...

Most modern 24VDC switch mode power supplies generally have what's referred to as a "crowbar circuit" that will turn off the output if the current draw is higher than the PS is capable of delivering,...
Forum: LIVE PLC Questions And Answers April 7th, 2020, 04:21 PM
Replies: 41
Views: 1,971
Posted By jraef
We are both right (or both wrong, depending on...

We are both right (or both wrong, depending on your point of view).
Forum: LIVE PLC Questions And Answers April 7th, 2020, 04:12 PM
Replies: 13
Views: 429
Posted By jraef
The 525 does not do torque control unfortunately....

The 525 does not do torque control unfortunately. You need a 7 class drive for that. In a perfect world, you would do this with Line Regenerative drives, like the PF755TR, so that you can...
Forum: LIVE PLC Questions And Answers April 7th, 2020, 04:04 PM
Replies: 15
Views: 493
Posted By jraef
Yes, yes and maybe. Yes, you want what's referred...

Yes, yes and maybe. Yes, you want what's referred to as a safety limit controller, separate from the PID controller and tied to a line contactor that is usually held closed by the limit controller...
Forum: LIVE PLC Questions And Answers April 7th, 2020, 03:38 PM
Replies: 13
Views: 360
Posted By jraef
Current control is torque control; meaning...

Current control is torque control; meaning keeping control of the torque is more important than the speed, speed is secondary to torque. So an example would be a winder application where speed is...
Forum: LIVE PLC Questions And Answers April 6th, 2020, 06:38 PM
Replies: 31
Views: 1,156
Posted By jraef
+1 on the A-B Micro830. Programming software is...

+1 on the A-B Micro830. Programming software is free (Connected Components Workbench), is expandable if you even end up needing analog and if you end up needing more (Micro850) or less (Micro820)...
Forum: LIVE PLC Questions And Answers April 3rd, 2020, 03:56 PM
Replies: 41
Views: 1,971
Posted By jraef
That is an oddball panel, but he is incorrect...

That is an oddball panel, but he is incorrect about High Leg Delta being "banned by the NEC". Totally wrong there, it's still available and is in fact very common in some areas.
Forum: LIVE PLC Questions And Answers April 1st, 2020, 04:08 PM
Replies: 15
Views: 911
Posted By jraef
Along the lines of "inexpensive marketing", if it...

Along the lines of "inexpensive marketing", if it were a heretofore unknown customer from a referral or something, I have, on occasion, volunteered the help as you did, then send them an invoice the...
Forum: LIVE PLC Questions And Answers April 1st, 2020, 03:55 PM
Replies: 41
Views: 1,971
Posted By jraef
If it is for controls, SOURCED WITHIN THE SAME...

If it is for controls, SOURCED WITHIN THE SAME PANEL it would be red. If the 240V used for control is coming from OUTSIDE of the panel and NOT DISCONNECTED by the main disconnect for it, then it...
Forum: LIVE PLC Questions And Answers March 31st, 2020, 03:32 PM
Replies: 41
Views: 1,971
Posted By jraef
Well, from our perspective YOU all have it...

Well, from our perspective YOU all have it wrong... even in how to spell color!
Forum: LIVE PLC Questions And Answers March 31st, 2020, 03:24 PM
Replies: 8
Views: 374
Posted By jraef
I interpreted the question to be about the coils...

I interpreted the question to be about the coils of the contactors, in which case this is the salient point. In some types of heat control systems, there is a High Limit Safety Relay involved to...
Forum: LIVE PLC Questions And Answers March 31st, 2020, 03:12 PM
Replies: 41
Views: 1,971
Posted By jraef
If discussing PLCs and such, we are always...

If discussing PLCs and such, we are always discussing industrial applications.


The Black/Red on 240V circuits is applicable to residential wiring. It has no meaning or validity in industrial...
Forum: LIVE PLC Questions And Answers March 25th, 2020, 02:46 PM
Replies: 18
Views: 616
Posted By jraef
If it were me, I would use an interposing relay,...

If it were me, I would use an interposing relay, preferably a plug-in style. If you are unfamiliar with the term "interposing relay", you have the contact on the Soft Starter turn on a small relay,...
Forum: LIVE PLC Questions And Answers March 20th, 2020, 06:13 PM
Replies: 4
Views: 289
Posted By jraef
Depends on the heating element and system...

Depends on the heating element and system configuration. For example if you are using low voltage to the elements via a transformer in order to get high current, then you can't use the variable...
Forum: LIVE PLC Questions And Answers March 19th, 2020, 11:11 AM
Replies: 5
Views: 443
Posted By jraef
It means it only clears a fault when the current...

It means it only clears a fault when the current flows in that direction, so only on half of each sine wave....


JK:beerchug:


By the way, I love the concept of "protecting" semiconductor...
Forum: LIVE PLC Questions And Answers March 18th, 2020, 10:00 AM
Replies: 301
Views: 20,370
Posted By jraef
To paraphrase a meme sent out by a group called...

To paraphrase a meme sent out by a group called Snarky Nurses;
Forum: LIVE PLC Questions And Answers March 13th, 2020, 03:35 PM
Replies: 13
Views: 981
Posted By jraef
The physical size of the VFDs wasn't an issue,...

The physical size of the VFDs wasn't an issue, but all of the other things were. it was truly a huge fuster cluck.
Forum: LIVE PLC Questions And Answers March 13th, 2020, 03:34 PM
Replies: 13
Views: 981
Posted By jraef
Did you notice my last paragraph in the above...

Did you notice my last paragraph in the above post? Motor mfrs will tell you that if using a VFD, all motors are 1.0SF.
Forum: LIVE PLC Questions And Answers March 13th, 2020, 03:26 PM
Replies: 1
Views: 220
Posted By jraef
There is nothing in a 525 that would display "Not...

There is nothing in a 525 that would display "Not ready", so that is likely something involving your control system. The closest thing is that you can program one of the Opto Outputs to indicate...
Forum: LIVE PLC Questions And Answers March 13th, 2020, 03:07 PM
Replies: 301
Views: 20,370
Posted By jraef
I find it all but impossible to quit touching my...

I find it all but impossible to quit touching my face in various areas; eyes, nose, mouth etc. I was not aware of how often I do it until I started trying not to.


I need one of these:...
Forum: LIVE PLC Questions And Answers March 13th, 2020, 03:05 PM
Replies: 17
Views: 814
Posted By jraef
On a serious note actually somewhat relevant to...

On a serious note actually somewhat relevant to our industry, Arc Flash PPE regulations state strictly 100% cotton undergarments.
Showing results 1 to 25 of 500

 
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