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Search: Posts Made By: jraef
Forum: LIVE PLC Questions And Answers November 10th, 2018, 03:13 AM
Replies: 8
Views: 446
Posted By jraef
It will depend on the type of single phase motor...

It will depend on the type of single phase motor you have. The vast majority of them use a capacitor to start turning in the correct direction, then that capacitor is switched out of the circuit by a...
Forum: LIVE PLC Questions And Answers November 6th, 2018, 06:20 PM
Replies: 30
Views: 1,226
Posted By jraef
That's an option, but they have everything from...

That's an option, but they have everything from 120V to 600V, up to 30HP
Forum: LIVE PLC Questions And Answers November 6th, 2018, 05:19 PM
Replies: 8
Views: 463
Posted By jraef
If it is, but there is nobody there to hear it,...

If it is, but there is nobody there to hear it, is it still music?
Forum: LIVE PLC Questions And Answers November 6th, 2018, 05:17 PM
Replies: 30
Views: 1,226
Posted By jraef
+1 on the PF525. Built-in Ethernet I/P port and...

+1 on the PF525. Built-in Ethernet I/P port and if using a Rockwell Logix PLC, the AOP is right there for you. Plug and play.
Forum: LIVE PLC Questions And Answers October 30th, 2018, 03:02 PM
Replies: 1
Views: 112
Posted By jraef
The XLD soft starter uses Modbus RTU protocol...

The XLD soft starter uses Modbus RTU protocol over RS-485. You need the info from their manual giving you the Modbus Resister Map to be able to communicate to it. I believe this is a separate manual,...
Forum: LIVE PLC Questions And Answers October 30th, 2018, 12:41 PM
Replies: 18
Views: 615
Posted By jraef
Most likely your motor is too small for the load...

Most likely your motor is too small for the load and the VFD (inverter drive, same thing) is protecting the motor from thermal overload. That's why it is making you wait before restarting it, it is...
Forum: LIVE PLC Questions And Answers October 26th, 2018, 12:00 PM
Replies: 21
Views: 995
Posted By jraef
If it were a PM motor, spinning the shaft by hand...

If it were a PM motor, spinning the shaft by hand will produce a voltage on the windings.

The F7 was not capable of controlling PMAC motors, so I doubt it is that. This is likely an issue with...
Forum: LIVE PLC Questions And Answers October 26th, 2018, 10:50 AM
Replies: 22
Views: 1,122
Posted By jraef
The A-B Ethernet cable is indeed rated for 600V...

The A-B Ethernet cable is indeed rated for 600V insulation AND is rated M3 I3 C3 E3 as far as ISOLATION and noise immunity, the highest rating available. ...
Forum: LIVE PLC Questions And Answers October 26th, 2018, 10:19 AM
Replies: 2
Views: 236
Posted By jraef
I agree, but I’ll just point out that this only...

I agree, but I’ll just point out that this only tells you what it MIGHT consume, worst case scenario. The motor will only pull FLA if DEMANDED by the load, but the load is king here. If someone wants...
Forum: LIVE PLC Questions And Answers October 24th, 2018, 07:47 PM
Replies: 4
Views: 912
Posted By jraef
Common problem of the modern day... 755s...

Common problem of the modern day...

755s use a small Lithium battery to back up the clock. But you cannot ship even little coin cell lithium batteries via air freight now, so 755s are shipped...
Forum: LIVE PLC Questions And Answers October 24th, 2018, 07:26 PM
Replies: 9
Views: 357
Posted By jraef
I hope you/he realizes that the circuit breaker...

I hope you/he realizes that the circuit breaker referenced in that link is not allowed to be used as branch circuit protection, meaning that there must be a BCP device ahead of it.

You can switch...
Forum: LIVE PLC Questions And Answers October 21st, 2018, 11:59 PM
Replies: 21
Views: 995
Posted By jraef
Well, 460 or 230V, but not 75V! Sometimes...

Well, 460 or 230V, but not 75V!

Sometimes though, OEMs will have custom motors made for some specific reason and without knowing what that reason is, we can only guess. It might be wrong...
Forum: LIVE PLC Questions And Answers October 21st, 2018, 12:31 PM
Replies: 14
Views: 390
Posted By jraef
It is load dependent, so there is no "standard"...

It is load dependent, so there is no "standard" time value that we can tell you. The critical issue is that the motor must get to 90% speed or greater before you transition, otherwise your motor will...
Forum: LIVE PLC Questions And Answers October 21st, 2018, 12:23 PM
Replies: 30
Views: 1,270
Posted By jraef
1) The PF525 offers velocity vector control only,...

1) The PF525 offers velocity vector control only, and although it has good torque control, it does not have an actual torque regulator in that tiny little package. So you can't do a second drive as a...
Forum: LIVE PLC Questions And Answers October 20th, 2018, 08:04 PM
Replies: 7
Views: 332
Posted By jraef
The PLC can only provide a signal as to what...

The PLC can only provide a signal as to what speed to run, it cannot directly control the fan itself. You need a power control device of some sort.

What you need or how you would interface with...
Forum: LIVE PLC Questions And Answers October 19th, 2018, 10:58 AM
Replies: 9
Views: 518
Posted By jraef
It will depend on your available supply voltage....

It will depend on your available supply voltage. If you use a 480V supply and motors DESIGNED for 460V 60 Hz, 4 pole motors of equal or closest size over those values should be fine. If you use...
Forum: LIVE PLC Questions And Answers October 19th, 2018, 10:49 AM
Replies: 15
Views: 715
Posted By jraef
If you are doing a safety evaluation of a system...

If you are doing a safety evaluation of a system that requires using force guided relays with the safety monitor, you will not be in compliance with the requirements of the safety circuit using...
Forum: LIVE PLC Questions And Answers October 18th, 2018, 02:28 PM
Replies: 8
Views: 311
Posted By jraef
Read KnowledgeBase article 60178 too. It give you...

Read KnowledgeBase article 60178 too. It give you steps for troubleshooting a GF trip. It also confirms the 1000V megger issue.
Forum: LIVE PLC Questions And Answers October 18th, 2018, 12:51 PM
Replies: 8
Views: 311
Posted By jraef
Drives are often much better at finding faults...

Drives are often much better at finding faults than simple test systems. One thing that can happen is that there are tiny pin holes in the insulation caused by corona discharge due to standing waves...
Forum: LIVE PLC Questions And Answers October 18th, 2018, 12:00 PM
Replies: 10
Views: 532
Posted By jraef
Probably an old “DC drive contactor”. The NC pole...

Probably an old “DC drive contactor”. The NC pole was used in a braking scheme when you absolutely wanted braking every time the drive turned off, like on a hoist. Not much call for them any more,...
Forum: LIVE PLC Questions And Answers October 18th, 2018, 11:50 AM
Replies: 7
Views: 436
Posted By jraef
Whenever a VFD is initially powered up, the...

Whenever a VFD is initially powered up, the capacitors on the DC bus charge themselves up instantly and would pull such high current that they will damage themselves or other components. So to...
Forum: LIVE PLC Questions And Answers October 17th, 2018, 08:35 PM
Replies: 10
Views: 252
Posted By jraef
Where the heck did you read that??? I've never...

Where the heck did you read that??? I've never seen or heard of such a thing. In fact on the 22 Series cards, the closest thing I could find says almost the opposite:
"I/O terminals labeled ď(Ė)Ē or...
Forum: LIVE PLC Questions And Answers October 17th, 2018, 07:52 PM
Replies: 10
Views: 252
Posted By jraef
I don't mean to be condescending, but I've done...

I don't mean to be condescending, but I've done this...


Did you double check to see that you told it you are using 4-20mA? The factory default is 0-10VDC, so if it is getting a constant 10VDC or...
Forum: LIVE PLC Questions And Answers October 16th, 2018, 11:30 PM
Replies: 7
Views: 295
Posted By jraef
Iíve heard there are USB port issues with W10....

Iíve heard there are USB port issues with W10. Iím not using it yet though so I donít know, but a coworker who is using it has had this happen and pointed me to this MS article. ...
Forum: LIVE PLC Questions And Answers October 13th, 2018, 03:09 PM
Replies: 4
Views: 445
Posted By jraef
The general rule of thumb is that the less...

The general rule of thumb is that the less expensive drives (like the 355 and similar products) cannot accurately run in Vector modes if the motor is less than 50% of the Drive’s rating. The current...
Showing results 1 to 25 of 500

 
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