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Search: Posts Made By: Leadfoot
Forum: LIVE PLC Questions And Answers August 29th, 2007, 03:17 PM
Replies: 7
Views: 2,049
Posted By Leadfoot
All meters work just fine with DC SCR drives. ...

All meters work just fine with DC SCR drives. The true RMS meters are more accurate with PWM than they are given credit for.

Do you have to stay with a DC drive and motor?
Forum: LIVE PLC Questions And Answers August 22nd, 2007, 08:44 PM
Replies: 15
Views: 2,242
Posted By Leadfoot
40*C is considered ******t temp for most electric...

40*C is considered ******t temp for most electric motors.
Forum: LIVE PLC Questions And Answers August 14th, 2007, 09:59 AM
Replies: 64
Views: 8,078
Posted By Leadfoot
I always get a chuckle when I ask the operators,...

I always get a chuckle when I ask the operators, "what were you doing when it went down?".

Typical response, NOTHIN'.

Me: OK, I won't tell your boss but you should have been running the...
Forum: LIVE PLC Questions And Answers August 8th, 2007, 11:32 AM
Replies: 8
Views: 2,322
Posted By Leadfoot
Look closely at the transformer. It probably can...

Look closely at the transformer. It probably can be programmed to provide the actual 230 volt input for the drive.
Forum: LIVE PLC Questions And Answers August 8th, 2007, 11:04 AM
Replies: 12
Views: 1,900
Posted By Leadfoot
What is the price of Polish Sausage these days?

What is the price of Polish Sausage these days?
Forum: LIVE PLC Questions And Answers July 26th, 2007, 05:19 PM
Replies: 26
Views: 4,409
Posted By Leadfoot
Jesper. You are right on both methods of...

Jesper.

You are right on both methods of CT's failing. SOme just explode due to the high voltage breaking down the insulation causing high amperage and excessive heat. Some just sizzle.

I...
Forum: LIVE PLC Questions And Answers July 24th, 2007, 01:25 AM
Replies: 26
Views: 4,409
Posted By Leadfoot
Remember all transformers have 2 ratios. ...

Remember all transformers have 2 ratios. Tyically they are rated in voltage. 4 to 1 as in 480 to 120 volt transfrmers. The current ratio will be 1 to 4.

With a CT you get the CURRENT ratio. ...
Forum: LIVE PLC Questions And Answers June 28th, 2007, 11:15 AM
Replies: 6
Views: 2,794
Posted By Leadfoot
Siemans products are ram memory hogs. Max out...

Siemans products are ram memory hogs. Max out your ram and un check the siemans lines from your start up list.
Forum: LIVE PLC Questions And Answers June 25th, 2007, 08:13 AM
Replies: 10
Views: 8,750
Posted By Leadfoot
I do not know of any rule or regulation but every...

I do not know of any rule or regulation but every intrinsic panel I have seen had a seperate shield ground for signals in the intrinsic panel.

Intrinsic panels are to help prevent sparks in...
Forum: LIVE PLC Questions And Answers June 25th, 2007, 08:08 AM
Replies: 15
Views: 2,355
Posted By Leadfoot
That would be way too easy.

That would be way too easy.
Forum: LIVE PLC Questions And Answers June 24th, 2007, 08:05 AM
Replies: 10
Views: 8,750
Posted By Leadfoot
1. If you ground the shield at both ends, it can...

1. If you ground the shield at both ends, it can and will conduct current. Even though the potential is low, large amounts of current can flow. With current flowing in the shield, you have magnetic...
Forum: LIVE PLC Questions And Answers June 24th, 2007, 07:53 AM
Replies: 4
Views: 1,227
Posted By Leadfoot
Woodward is the brand of diesel governor's used...

Woodward is the brand of diesel governor's used the most. They can handle anything used by diesel gen sets including the new electronic fuel injection ones.

I usually see the 2300 series used...
Forum: LIVE PLC Questions And Answers June 24th, 2007, 07:50 AM
Replies: 15
Views: 2,355
Posted By Leadfoot
One thing you need to remember, the surge current...

One thing you need to remember, the surge current will be quite high. The starting aka inrush current of the motor determined by the KVA code will also probably happen and then some during the...
Forum: LIVE PLC Questions And Answers June 24th, 2007, 07:41 AM
Replies: 3
Views: 3,607
Posted By Leadfoot
When you are on line with the plc, if it has a...

When you are on line with the plc, if it has a built in clock, it will show in the project work space (Alt+1) with the symbols, memory and I/O The clock does not show unless you are on line.
Forum: LIVE PLC Questions And Answers June 22nd, 2007, 11:33 AM
Replies: 4
Views: 1,050
Posted By Leadfoot
You also want to set the carrier frequency to its...

You also want to set the carrier frequency to its lowest setting.
Forum: LIVE PLC Questions And Answers June 19th, 2007, 08:31 PM
Replies: 34
Views: 6,286
Posted By Leadfoot
I have done a variety of DC input VFD's. ALL of...

I have done a variety of DC input VFD's. ALL of them had dynamic braking on them. A couple actualy had battery pack to provide the power in the event the AC input failed to allow controlled shut...
Forum: LIVE PLC Questions And Answers June 19th, 2007, 08:15 PM
Replies: 11
Views: 2,557
Posted By Leadfoot
I got in to instruction in the Navy. I taught at...

I got in to instruction in the Navy. I taught at the Basic Electricity and Electronics school in San Diego. It was full of students wanting an education. I totally enjoyed that experience.
...
Forum: LIVE PLC Questions And Answers June 18th, 2007, 03:53 PM
Replies: 47
Views: 7,130
Posted By Leadfoot
And here I thought they were just air-headed.

And here I thought they were just air-headed.
Forum: LIVE PLC Questions And Answers June 13th, 2007, 07:43 AM
Replies: 6
Views: 1,194
Posted By Leadfoot
Are you refering to the auto tuning function to...

Are you refering to the auto tuning function to identify the motor?

You should always auto tune when using either open or closed loop vector.
Forum: LIVE PLC Questions And Answers June 11th, 2007, 08:25 AM
Replies: 61
Views: 5,596
Posted By Leadfoot
you may be old if:

you ever trouble shot equipment by the glow or lack thereof of the vacuum tubes.

you worked with chokes and condensors.

frequency was measured in cycles per second.
Forum: LIVE PLC Questions And Answers June 10th, 2007, 08:27 AM
Replies: 61
Views: 5,596
Posted By Leadfoot
I am the perfect age. I am old enough to know...

I am the perfect age. I am old enough to know better and too young to worry about it.

My manager is called Grand Pa. I found out he is 6 years younger than me.

Age is relative. I get...
Forum: LIVE PLC Questions And Answers June 10th, 2007, 08:09 AM
Replies: 12
Views: 1,389
Posted By Leadfoot
You probably will spend more time and effort...

You probably will spend more time and effort trying to "FIND" the exact replacement than getting one that will work and drilling a couple of screw holes.
Forum: LIVE PLC Questions And Answers May 18th, 2007, 05:14 PM
Replies: 10
Views: 5,223
Posted By Leadfoot
The output switching of PWM is 6 steps just like...

The output switching of PWM is 6 steps just like the VVI type inverters. When you turn on the igbt, you put full voltage thru to the motor lead.

At all times 3 transistors are conducting. 2...
Forum: LIVE PLC Questions And Answers May 8th, 2007, 12:54 PM
Replies: 4
Views: 990
Posted By Leadfoot
Since you said 600 VAC you drive is probably...

Since you said 600 VAC you drive is probably rated 575 +10%.

The DC bus overvoltage level typically adjusts by how you program the actual input voltage. If you left it at 575 it will trip...
Forum: LIVE PLC Questions And Answers May 8th, 2007, 09:44 AM
Replies: 4
Views: 1,334
Posted By Leadfoot
You might try and save the program with a new...

You might try and save the program with a new name. Then delete the areas you do not need. Then concentrate on what you do have and fine tune it.

You also might see that the different INFEEDS...
Showing results 1 to 25 of 500

 
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