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Search: Posts Made By: jraef
Forum: LIVE PLC Questions And Answers February 16th, 2021, 03:58 PM
Replies: 11
Views: 771
Posted By jraef
Are you in V/Hz mode or in Induction SV Mode...

Are you in V/Hz mode or in Induction SV Mode (parameter 35)? Because if you left it at the factory default you are in Induction SV Mode and the V/Hz pattern will be optimized to whatever is necessary...
Forum: LIVE PLC Questions And Answers February 15th, 2021, 05:19 PM
Replies: 11
Views: 771
Posted By jraef
If the drive is being over loaded, and you have...

If the drive is being over loaded, and you have set the response to try to avoid shutting down, it will respond by altering (restricting) the maximum frequency that you can run at. In the PF753, this...
Forum: LIVE PLC Questions And Answers February 15th, 2021, 04:48 PM
Replies: 8
Views: 418
Posted By jraef
If you have equipment "that needs to be running...

If you have equipment "that needs to be running at all time", do you not have a backup generator? If so, and there is an Automatic Transfer Switch involved, most of them have the ability to provide...
Forum: LIVE PLC Questions And Answers February 15th, 2021, 04:43 PM
Replies: 11
Views: 576
Posted By jraef
This is confirmed by the definition of an...

This is confirmed by the definition of an "industrial control panel" in the US National Electric Code.


There is no definition of a "junction box" but it is referred to in many places, along with...
Forum: LIVE PLC Questions And Answers February 11th, 2021, 08:22 PM
Replies: 22
Views: 1,169
Posted By jraef
What Gary said first is the likely root cause; a...

What Gary said first is the likely root cause; a failure in the gate circuit of the Soft Starter. Although rare, that used to happen on the old Saftronics, Benshaw and Motortronics analog soft...
Forum: LIVE PLC Questions And Answers January 28th, 2021, 03:20 PM
Replies: 13
Views: 1,203
Posted By jraef
You can do all of that with a PowerFlex 523 or...

You can do all of that with a PowerFlex 523 or 525. To get the "DC injection motor winding heater" function though, you have to program one of the Digital Inputs as "Force DC" to where the DC...
Forum: LIVE PLC Questions And Answers January 22nd, 2021, 01:43 PM
Replies: 14
Views: 971
Posted By jraef
Been there, done that, I'll never go back. Relay...

Been there, done that, I'll never go back. Relay contacts have a finite life and when they wear out, you have to replace the entire output card.

I built a sortation system that used relay outputs...
Forum: LIVE PLC Questions And Answers January 22nd, 2021, 01:28 PM
Replies: 3
Views: 423
Posted By jraef
Not specific to the PF525 drives, but in general...

Not specific to the PF525 drives, but in general I have had issues with Safety Relay Circuits being run through standard relay contacts. The problem is that the safety circuits are not enough load to...
Forum: LIVE PLC Questions And Answers January 20th, 2021, 08:37 PM
Replies: 14
Views: 786
Posted By jraef
That is EXACTLY the issue. SOME small (15-20A 1-2...

That is EXACTLY the issue. SOME small (15-20A 1-2 pole) breakers (Square D QOU for example) have terminals that are UL listed for two wires per terminal. Many others are NOT, so if you chose one that...
Forum: LIVE PLC Questions And Answers January 20th, 2021, 08:25 PM
Replies: 45
Views: 3,243
Posted By jraef
I know for a fact that there are SWER systems in...

I know for a fact that there are SWER systems in use in far flung regions of ranch land in Northern Nevada, out around the Black Rock desert (where Burning Man is held). I have had a couple of trips...
Forum: LIVE PLC Questions And Answers January 13th, 2021, 02:06 PM
Replies: 14
Views: 1,078
Posted By jraef
It would be 400 Delta, 690 Star. 400 x 1.732 =...

It would be 400 Delta, 690 Star. 400 x 1.732 = 692...

The other older voltage rating was 380/660V, but that has been superseded. People still get confused...
Forum: LIVE PLC Questions And Answers January 12th, 2021, 02:42 PM
Replies: 6
Views: 574
Posted By jraef
But I haven't seen a PCMCIA slot on a laptop for...

But I haven't seen a PCMCIA slot on a laptop for a decade or more...
Forum: LIVE PLC Questions And Answers January 12th, 2021, 02:41 PM
Replies: 14
Views: 1,078
Posted By jraef
If you apply 400V to a motor connected for 660V,...

If you apply 400V to a motor connected for 660V, the motor will develop only 58% of its running torque, and more importantly, only 33% of its PEAK torque capability. Peak torque (Break Down Torque)...
Forum: LIVE PLC Questions And Answers December 30th, 2020, 01:44 PM
Replies: 4
Views: 783
Posted By jraef
You would not use the 12A MCB as the LOAD, that...

You would not use the 12A MCB as the LOAD, that is the PROTECTIVE DEVICE for the load. You must use the ACTUAL load for whatever that 12A MCB is feeding. But if you did it this way, you are fine...
Forum: LIVE PLC Questions And Answers December 29th, 2020, 03:34 PM
Replies: 4
Views: 783
Posted By jraef
Are you wanting this for sizing the internal...

Are you wanting this for sizing the internal components and protective devices feeding the servo, or for the terminals going to the motor? If this is concerning the circuit components and the servo...
Forum: LIVE PLC Questions And Answers December 24th, 2020, 06:46 PM
Replies: 42
Views: 3,682
Posted By jraef
If you connect it in Delta ("triangle"), it needs...

If you connect it in Delta ("triangle"), it needs 380V.

If you connect it in Star (Wye), it needs 660V. 660V is now a valid voltage in some parts of the world, but is not used in North America....
Forum: LIVE PLC Questions And Answers December 24th, 2020, 06:42 PM
Replies: 5
Views: 893
Posted By jraef
Hint; Sarah Palin said she could see Russia...

Hint;
Sarah Palin said she could see Russia from her house!
Forum: LIVE PLC Questions And Answers December 23rd, 2020, 04:43 PM
Replies: 14
Views: 1,413
Posted By jraef
I don't consider MCBs to be suitable for use as...

I don't consider MCBs to be suitable for use as Main breakers on industrial controls, they are only rated for 10kAIC, most industrial plants will have more than that as Available Fault Current. I...
Forum: LIVE PLC Questions And Answers December 23rd, 2020, 04:41 PM
Replies: 16
Views: 1,389
Posted By jraef
You have a 16A rated soft starter. You have...

You have a 16A rated soft starter.

You have a 1/3HP 480V motor, the FLA is likely in the area of 0.9A.

So if the motor is unloaded the current is likely even lower than that.

The SMC-3 (and...
Forum: LIVE PLC Questions And Answers December 22nd, 2020, 05:26 PM
Replies: 14
Views: 1,413
Posted By jraef
Correct. Look at the actual LOADS that are...

Correct. Look at the actual LOADS that are connected to the devices, the motors and the power supply. Find the largest load Full Load Current rating, multiply it by 1.25, then add that to all of the...
Forum: LIVE PLC Questions And Answers December 22nd, 2020, 05:21 PM
Replies: 14
Views: 1,413
Posted By jraef
I interpreted it to mean that is where he is...

I interpreted it to mean that is where he is getting the information from.
Forum: LIVE PLC Questions And Answers December 17th, 2020, 08:18 PM
Replies: 5
Views: 755
Posted By jraef
As a set of contacts open while current is...

As a set of contacts open while current is flowing, like with a contactor or disconnect, the current forms an arc across the gap until the air gap distance increases to where the dielectric is high...
Forum: LIVE PLC Questions And Answers December 11th, 2020, 04:46 PM
Replies: 22
Views: 1,741
Posted By jraef
Soft PLC + BSOD= total disaster...

Soft PLC + BSOD= total disaster...
Forum: LIVE PLC Questions And Answers December 10th, 2020, 03:54 PM
Replies: 26
Views: 2,029
Posted By jraef
Saw your response too late... Several of the...

Saw your response too late...

Several of the AFE drive suppliers are now allowing you to set up, in programming, the ability of allowing the VFD to EXPORT VARs to help compensate for other...
Forum: LIVE PLC Questions And Answers December 10th, 2020, 03:50 PM
Replies: 26
Views: 2,029
Posted By jraef
By "they" I assume you mean the utility? ...

By "they" I assume you mean the utility?

They don't know, or care, how you correct the PF, they measure the VARs you require and use that to penalize you. If you use PFC capacitors to provide the...
Showing results 1 to 25 of 500

 
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