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Search: Posts Made By: leitmotif
Forum: LIVE PLC Questions And Answers September 11th, 2014, 09:25 PM
Replies: 26
Views: 5,046
Posted By leitmotif
That sure looks like a two speed motor to me with...

That sure looks like a two speed motor to me with two separate windings one for each speed. Only one of two possible nameplates was provided, there should be another for the other sets of windings. ...
Forum: LIVE PLC Questions And Answers July 24th, 2014, 08:46 PM
Replies: 12
Views: 2,417
Posted By leitmotif
It is going to be nice when we stop being human...

It is going to be nice when we stop being human become perfect and stop making them darn mistakes.

Dan Bentler
Forum: LIVE PLC Questions And Answers July 24th, 2014, 01:18 PM
Replies: 12
Views: 2,417
Posted By leitmotif
Dick Thank you for confirming my uhh...

Dick

Thank you for confirming my uhh "fears". I am doing 3rd hand consultation and have not seen the machine - dont even have nameplate info.

I was thinking same use 8 pole and adjust its...
Forum: LIVE PLC Questions And Answers July 24th, 2014, 08:29 AM
Replies: 12
Views: 2,417
Posted By leitmotif
MILLDRONE I predict the current for low speed...

MILLDRONE
I predict the current for low speed to be double that of high.

BEARING C
If it were mine I would run it in low speed since it is driving a lathe. I could always use 150% RPM to gain...
Forum: LIVE PLC Questions And Answers July 23rd, 2014, 11:56 PM
Replies: 11
Views: 1,880
Posted By leitmotif
I was wondering the same thing. Have never seen...

I was wondering the same thing. Have never seen a gearbox with any kind of hazard labeling on it.

In post 4 you mentioned there are European standards. I would look at them and copy if possible...
Forum: LIVE PLC Questions And Answers July 23rd, 2014, 11:45 PM
Replies: 12
Views: 2,417
Posted By leitmotif
VFD used for two speed motor

Application is a lathe. The motor is 3 phase two speed ie 4 pole (1800 synch RPM) and 8 pole (900 RPM synch), rated approx 3 HP - have not seen and not sure HP rating applies to both windings. For...
Forum: LIVE PLC Questions And Answers June 28th, 2014, 12:46 AM
Replies: 8
Views: 1,330
Posted By leitmotif
FIRST you must understand what the machine does...

FIRST you must understand what the machine does and what happens when there are screwups.

Draw a sketch of what this thing may look like.


DEFINITIONS last conveyer is 3 middle is 2 and first...
Forum: LIVE PLC Questions And Answers June 24th, 2014, 01:29 AM
Replies: 30
Views: 2,952
Posted By leitmotif
Since this is for a press I would be very tempted...

Since this is for a press I would be very tempted to use the motor as is. Presses can be hard starting - additionally after the ram activates the motor is full loaded and maybe then some to keep the...
Forum: LIVE PLC Questions And Answers January 19th, 2014, 09:30 PM
Replies: 7
Views: 1,217
Posted By leitmotif
Went back to the publication that has started...

Went back to the publication that has started this confusion. It is not the best written for student understanding. In his case I am going to call it an error.

Checked factory web sites and...
Forum: LIVE PLC Questions And Answers January 15th, 2014, 02:56 PM
Replies: 7
Views: 1,217
Posted By leitmotif
Yeah I know "the devil made me do it" ...

Yeah I know "the devil made me do it"

Dan
Forum: LIVE PLC Questions And Answers January 15th, 2014, 12:45 PM
Replies: 7
Views: 1,217
Posted By leitmotif
Where is the truth ??

With respect to motors controlled by a VFD

Between O RPM and Baseline
Torque "capacity" motor is equal to that of rated torque.
Voltage is proportional to frequency ie 240/60 or 480/60
RPM is...
Forum: LIVE PLC Questions And Answers December 12th, 2013, 12:17 PM
Replies: 10
Views: 1,460
Posted By leitmotif
What pipe size of valves?? If one inch or less...

What pipe size of valves?? If one inch or less may be less expensive to use solenoid actuated.

Dan Bentler
Forum: LIVE PLC Questions And Answers December 10th, 2013, 11:57 PM
Replies: 3
Views: 964
Posted By leitmotif
I would add to the 20 queston list 1. Rated...

I would add to the 20 queston list
1. Rated motor vs VFD voltages
2. Percentage of RPM range motor is operated at (if very low (say 10% or less) speed, motor internal fan will not be able to move...
Forum: LIVE PLC Questions And Answers November 26th, 2013, 10:55 PM
Replies: 12
Views: 2,196
Posted By leitmotif
More machinery vehicles and rigging gear have...

More machinery vehicles and rigging gear have been torn up by letting slack in and then getting a good running start on it.

This is true for chain drive also.

For both V belt and chain drive...
Forum: LIVE PLC Questions And Answers November 24th, 2013, 08:54 PM
Replies: 59
Views: 23,431
Posted By leitmotif
Go back to Live PLC Q & A ie one page back. At...

Go back to Live PLC Q & A ie one page back. At top left corner of the thread list (not top of page) click on green box "Start a New Thread"

Dan Bentler
Forum: LIVE PLC Questions And Answers November 20th, 2013, 02:40 PM
Replies: 17
Views: 2,520
Posted By leitmotif
Here is what I think I understand 1. PLC is...

Here is what I think I understand
1. PLC is mounted on a rotating machine
2. Power fed to PLC via slip ring
3. Slip ring limited to 2 A
4. PLC and other stuff on machine draws more than 2 A...
Forum: LIVE PLC Questions And Answers November 16th, 2013, 04:44 PM
Replies: 26
Views: 3,399
Posted By leitmotif
I assume you are pumping to a common header with...

I assume you are pumping to a common header with multiple pumps. I would do two things
1 make calc of maximum flow and pressure drop - size pipe to minimal / desirable liquid velocity. Too large...
Forum: LIVE PLC Questions And Answers November 10th, 2013, 06:58 PM
Replies: 2
Views: 905
Posted By leitmotif
Any high pressure system deserves care and...

Any high pressure system deserves care and caution

High pressure washers, airless spray paint, water jet cutters, compressed gases, steam, diesel injectors and the list goes on.

Dan Bentler
Forum: LIVE PLC Questions And Answers November 2nd, 2013, 01:53 PM
Replies: 16
Views: 2,432
Posted By leitmotif
Am thinking belt conveyer - there are others of...

Am thinking belt conveyer - there are others of course.

One advantage of VFD is reduced wear and tear on driveline components ie belts chains reducers etc.

On a conveyer especially if start...
Forum: LIVE PLC Questions And Answers November 1st, 2013, 02:55 PM
Replies: 17
Views: 3,535
Posted By leitmotif
I have thought it would be better to have the...

I have thought it would be better to have the disconnecting means completely outside the cabinet. That way everything should be dead (may require more than one disconnect of course).

The thru...
Forum: LIVE PLC Questions And Answers October 30th, 2013, 09:46 PM
Replies: 6
Views: 989
Posted By leitmotif
Since Canada is metric system a cheap method and...

Since Canada is metric system a cheap method and probably most reliable would be a meter stick I think.

Dan Bentler
Forum: LIVE PLC Questions And Answers October 19th, 2013, 01:17 PM
Replies: 6
Views: 1,476
Posted By leitmotif
A wiring and plumbing diagram would sure help to...

A wiring and plumbing diagram would sure help to diagnose this situation.

Does the unit have cooling capacity? Is cooling capacity higher than heating capacity ie can I remove more BTU by cooling...
Forum: LIVE PLC Questions And Answers October 14th, 2013, 12:37 AM
Replies: 11
Views: 1,952
Posted By leitmotif
This is a huge problem for contractors 1. Can...

This is a huge problem for contractors
1. Can they trust the plant to tell them the truth?
2. In the case you cited they did not tell their own employee
- ASSUMING - it really was silica dust...
Forum: LIVE PLC Questions And Answers October 10th, 2013, 02:00 PM
Replies: 8
Views: 1,172
Posted By leitmotif
Remember the OP said optimum. From my...

Remember the OP said optimum.

From my experience the optimum would be seven feet - this way you do not need to lay on the floor and have people step on you. AND for Petes sake put in some...
Forum: LIVE PLC Questions And Answers October 9th, 2013, 11:23 AM
Replies: 29
Views: 3,144
Posted By leitmotif
GE's Etrak was a pretty good machine - know a guy...

GE's Etrak was a pretty good machine - know a guy who has one. Not sure about them running all afternoon - motor speed control was done with resistors.

John Deere I think has several models of...
Showing results 1 to 25 of 500

 
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