ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat Box
Recent Posts
Pool Lights?
by Papa - 09/18/20 05:26 PM
Ever been afflicted by Gout?
by mbhydro - 09/15/20 05:50 PM
Questioning the electrical norms
by gfretwell - 09/13/20 01:17 PM
120/208 gives 240? please clarify
by NORCAL - 09/13/20 01:08 AM
Lock-down Thread
by Trumpy - 09/11/20 11:17 PM
New in the Gallery:
Facebook follies, bad wiring
FPE in Germany pt.2
Who's Online Now
0 registered members (), 15 guests, and 9 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
crane motor speed control #127779 12/16/01 10:02 PM
Joined: Dec 2000
Posts: 218
S
spkjpr Offline OP
Member
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:
Re: crane motor speed control #127780 12/18/01 11:00 PM
Joined: Dec 2001
Posts: 3
T
Tom R Offline
Junior Member
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.

Re: crane motor speed control #127781 12/19/01 11:00 PM
Joined: Oct 2000
Posts: 2,721
Scott35 Offline
Broom Pusher and
Member
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!
Re: crane motor speed control #127782 12/24/01 04:29 PM
Joined: Dec 2000
Posts: 218
S
spkjpr Offline OP
Member
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.


Featured:

2020 National Electrical Code
2020 National Electrical
Code (NEC)

* * * * * * *

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
noderaser
noderaser
Portland, Oregon, United States
Posts: 404
Joined: March 2007
Show All Member Profiles 
Top Posters(30 Days)
Trumpy 8
NORCAL 3
Popular Topics(Views)
269,932 Are you busy
204,358 Re: Forum
192,577 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.3