ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Potseal 11
Recent Posts
600 KW 120/208 3 Phase Y protection
by Yooperup. 07/21/17 09:27 AM
1913 American Electrician's Handbook
by gfretwell. 07/20/17 01:08 PM
Green House wiring
by ghost307. 07/20/17 09:10 AM
Permit Snafus...AHJs and Contractors Jump in
by HotLine1. 07/18/17 08:06 PM
New in the Gallery:
SE cable question
Popular Topics(Views)
239,205 Are you busy
174,605 Re: Forum
167,033 Need opinion
Who's Online Now
0 registered members (), 62 guests, and 8 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
Page 1 of 2 1 2
#39528 - 06/23/04 03:02 PM Hello !  
Freqdrive  Offline
Junior Member
Joined: Jun 2004
Posts: 6
Chicago IL USA
Greets all ! I stumbled onto this website the other day looking for Panel Scheds.
Looking forward to the little infomation exchange going on in here !

I am a cradle to grave electrical contractor working in the Chicagoland area.
I am part of a electrical group for a Mechanical contractor. My projects lean towards industrial to heavy commercial.
I am currently starting to work on a design build power and controls for 250,000 sq ft of cooler/freezer . My weak area's are lighting , general power and the related switching , my strong area's are Freq Drives , Instramentation , TC , Data , and anything related to mechanical equiptment IE: Chillers , Cooling Towers , Absorbers , and Motor controls. I look forward to the info exchange.

P.S. I forgot to add spelling and punc. to my weak area [Linked Image]

[This message has been edited by Freqdrive (edited 06-23-2004).]

Work Gear for Electricians and the Trades

#39529 - 06/23/04 03:25 PM Re: Hello !  
Mean Gene  Offline
Joined: Oct 2003
Posts: 152
Ohio, USA
Greetings, and welcome to the board.

Send me an email and I will email you some nice panel schedules in Excel format. [Linked Image]

I also have a nice spell checker (Shareware, no spyware or adware attached) that works with text input boxes found on forums and the like. [Linked Image]

[This message has been edited by Mean Gene (edited 06-23-2004).]

#39530 - 06/23/04 03:33 PM Re: Hello !  
Bill Addiss  Offline
Joined: Oct 2000
Posts: 3,878

Welcome aboard,
You'll find the people here are happy to share what they know and help when they can.

[Linked Image]

#39531 - 06/23/04 04:13 PM Re: Hello !  
Joined: Jan 2003
Posts: 73
Welcome aboard Freqdrive.

Humm, It's ironic you have experince with Freq Drives. I have a quetion which came up today.

We have a client who has been having problems with some motor winding insulation breaking down pre-maturly connected to VFD's.

Any suggestions what to look for?

PS. they are exhaust fans, 50 or 75 HP @ 575 Volt, running at about 40 to 44Hz.


#39532 - 06/23/04 05:35 PM Re: Hello !  
Freqdrive  Offline
Junior Member
Joined: Jun 2004
Posts: 6
Chicago IL USA
Ok here's some tips.

1. Make sure its connected to a Inverter Duty motor. They have a better ins. class so the windings can handle the pounding it takes from a drive. GE XSD motors have performed the best for me to date.

2. Get the drive as close to the motor as possible. Drives cause ring back and can be damaging to the motor windings as well as the source equiptment. 10' is great if you have to be further than 50' contact the drive manu. and buy thier filters.

3. Consult the manual on how to lower the carrier freq try 4khz thats the lowest poss for drives at this time , the side effect will be "noise" it will sound louder. If thats a prob go to lowest poss. without the increase in Db . This will be easier on the motor windings and the transistors in the drive.

P.S. Make sure everything is grounded well ! but you prolly know that [Linked Image]

[This message has been edited by Freqdrive (edited 06-23-2004).]

#39533 - 06/23/04 06:15 PM Re: Hello !  
Roger  Offline
Joined: May 2002
Posts: 1,716
Welcome Freqdrive, you will enjoy the company here. [Linked Image]


#39534 - 06/23/04 07:47 PM Re: Hello !  
DougW  Offline
Joined: Jun 2003
Posts: 1,143
North Chicago, IL
Welcome to ECN!

Where are you in the Chi-town area? I'm up north by the Navy Base m'self...

#39535 - 06/24/04 01:31 AM Re: Hello !  
Lostazhell  Offline
Joined: Feb 2004
Posts: 1,431
Bakersfield, CA (Originally Or...
Welcome to the ECN family Freqdrive [Linked Image] As the others have stated, we're always more than willing to share knowledge & "tricks of the trade" here..
As variable speed drives & such are a popular cause for other electrical system ailments I've come across.. (3rd wave harmonics for one..) I'm sure we'll find your input here an asset [Linked Image] As we hope to reciprocate when you need... Not to mention the vast resources in ECN's techical boards which are a great reference point for general electrical information.

Feel free to join into the evening chats in here by clicking the yellow "ECN chat" oval on the left of your screen.. Subjects from PPE, business methods & advice, to just open subject "free for all" [Linked Image]


#39536 - 06/24/04 10:48 AM Re: Hello !  
Freqdrive  Offline
Junior Member
Joined: Jun 2004
Posts: 6
Chicago IL USA
Thanks all for the warm welcomes !

DougW, Im south suburbs Burr Ridge area. I have done 5 or 6 projects at the Navy base but, its been about a year since I had one up there...did some split units for some of the older barracks to provide AC in their lounge area's. You work at the base alot or just in that general area ??

#39537 - 06/26/04 01:47 PM Re: Hello !  
DougW  Offline
Joined: Jun 2003
Posts: 1,143
North Chicago, IL
I'm a one-man "indie" shop, so I stay away from bidding base jobs [Linked Image] ! I just work in the northern suburbs, and live by the base.

The last electrical work I was involved in down there was when I was on the FD (long before becoming an EC), and we remodeled the day room in the old fire station as a "self-help" project. As a general description of the job, I think this sums it up... Imagine a radio playing, drywall dust in the air, laughing and joking, then, a simultaneous bluish flash and the telltale POP!... and silence.

Suddenly, from the (newly darkened) room, the voice of my Lt.:

Oh... guess that circuit was still live after all

We managed to successfully complete the remodel - minus one slightly welded screwdriver!

Page 1 of 2 1 2

Member Spotlight
Shinnston, WV USA
Posts: 1,044
Joined: January 2001
Show All Member Profiles 

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.019s Queries: 15 (0.006s) Memory: 0.8197 MB (Peak: 0.9965 MB) Zlib enabled. Server Time: 2017-07-22 16:44:23 UTC