ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

ECN Shout Chat
Top Posters(30 Days)
Admin 16
Recent Posts
fuse rejectors
by gfretwell. 03/23/17 01:12 PM
Another Forum Update
by Admin. 03/22/17 03:04 PM
Dining room plugs
by watersparkfalls. 03/21/17 10:31 PM
TRUE POWER
by jraef. 03/21/17 09:13 PM
WEG CFW-11 Frequency Inverter
by jraef. 03/21/17 08:50 PM
New in the Gallery:
SE cable question
Popular Topics(Views)
231,275 Are you busy
165,982 Re: Forum
160,497 Need opinion
Who's Online Now
0 registered members (), 54 guests, and 13 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#127779 - 12/16/01 10:02 PM crane motor speed control  
spkjpr  Offline
Member
Joined: Dec 2000
Posts: 218
Sedalia,MO, USA
Scott 35 said some time ago that he had some info on the use of resistors to control the speed of a overhead crane motor. If you do could you post them or e-mail them to me? I have 2 weeks vacation and would have the time to study them before i go back to work. I would really like to have a better answer for the boss than, "it appears to be ok electrically, don't know why it's not working?!" Thanks, spkjpr.


Tools for Electricians:

#127780 - 12/18/01 11:00 PM Re: crane motor speed control  
Tom R  Offline
Junior Member
Joined: Dec 2001
Posts: 3
What type of Information are you looking for? Typically on the old Cranes the hoist drive was either a wound rotor motor (AC) with a drum or rheostat controller or a DC Motor and Controller that had either a step type series controller or a drum controller with stages of grids. The newer ones typically have some type of Electronics control (Tube type or solid state) interfaced either in a DC controller or the rotor circuit of a wound rotor motor.

I have been retired for about 6 years so I have purged many of my prints but I may be able to find some information if I knew specifically what you are looking for. If you can specify what type of system you have and if dynamic and/or regenerative braking is involved I will look through my old information and see if I can find something that might be of help to you. In your application do you also use bridge and carriage drives?
If you have multiple drives do they all use the same technology?

Tom R.


#127781 - 12/19/01 11:00 PM Re: crane motor speed control  
Scott35  Offline

Broom Pusher and
Member
Joined: Oct 2000
Posts: 2,707
Anaheim, CA. USA
Tom,

Could you scan and E-Mail a few of your Schematics, so I can draw them in AutoCAD then post here?

I can easilly draw up and post simple Wound Rotor Schematics, but it would be nice to have more precise details to add with the drawing which relate to Cranes.

If you can scan and send, save as .GIF or as .JPG with compression [or use PKZIP].

Send to me at:

adst at pacbell dot net
[phonetically spelled out to avoid lurking spambots [Linked Image]]

Thanks!!!

Scott SET


Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!

#127782 - 12/24/01 04:29 PM Re: crane motor speed control  
spkjpr  Offline
Member
Joined: Dec 2000
Posts: 218
Sedalia,MO, USA
Tom r and Scott. The motors in question are wound rotor AC with no dynamic braking. We have 3 different P&H cranes that all use this system. Thanks guys, I'll keep checking here in between Christmas parties.



Member Spotlight
SafetyWired
SafetyWired
Pa, USA
Posts: 44
Joined: July 2013
Show All Member Profiles 
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.010s Queries: 14 (0.003s) Memory: 0.7586 MB (Peak: 0.8900 MB) Zlib enabled. Server Time: 2017-03-24 02:10:37 UTC