ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Extension cords
by annemarie1. 09/20/18 08:54 AM
Inspection camera help
by Bill Addiss. 09/19/18 10:50 PM
220/230/240V 60Hz Systems
by gfretwell. 09/16/18 12:37 PM
Acronis Backup 2017
by gfretwell. 09/16/18 12:46 AM
Tingle off the water spigot
by Trumpy. 09/15/18 03:24 AM
New in the Gallery:
Plug terminals
Housebilding DIY wiring
Who's Online Now
0 registered members (), 42 guests, and 21 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Automating mutiple independently controlled motors #214494
12/15/14 10:52 PM
12/15/14 10:52 PM
S
sparkyinak  Offline OP
Member
Joined: Jul 2007
Posts: 1,335
Alaska
Here is a scenario. You have an older building that has multiple HVAC systems, fans, etc., throughout the building. Each sub system operates independently of one another. One day, the powers that be wants to integrate all these independent systems and control them with a central controller. All these fans and motors are various sizes and voltages running off of separate panels throughout the building.

Question: Does the control signal from the new control panel have to control the existing run circuits at each existing starter or can the existing motor and fan control circuits be looped through the new control panel?

I think the control panel must supply the coil power to the relay coils because by looping the control circuit through the control panel will leave multiple "hot" wires in the control panel even when the control panel is powered off presuming each existing motor starter has its own power source. At the same time a lighting control panel can have multiple circuits feeding the contactor from several panels and have the same issues of multiple "hot" wires in a control panel that is off.

By looping the existing run circuits to the new panel would eliminate the cost of retrofitting all the starters in the building to be compatible to the new control panel but I can not find a reference anywhere this either option is right or wrong.

Thoughts?


"Live Awesome!" - Kevin Carosa
Work Gear for Electricians and the Trades
Re: Automating mutiple independently controlled motors [Re: sparkyinak] #214495
12/16/14 12:00 AM
12/16/14 12:00 AM
T
Tesla  Offline
Member
Joined: Jun 2004
Posts: 1,273
Sacramento, CA
http://www.kmccontrols.com/products/Understanding_Building_Automation_and_Control_Systems.aspx

I don't work that end of the street, but I bet that the big players have already addressed what constitutes optimal design.

http://www.buildingtechnologies.sie...on/pages/building-automation-system.aspx

I believe that Honeywell is a major player.

http://buildingcontrols.honeywell.com/Building-Automation-Systems

This kind of design issue is exactly the type I throw to the specialists.

I'm simply not effective working well away from what I know.


Tesla

Featured:

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

 

Member Spotlight
Admin
Admin
NY, USA
Posts: 3,516
Joined: October 2000
Show All Member Profiles 
Top Posters(30 Days)
Admin 13
Trumpy 11
sparky 9
Popular Topics(Views)
249,308 Are you busy
187,243 Re: Forum
176,608 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.014s Queries: 15 (0.003s) Memory: 0.9451 MB (Peak: 1.0613 MB) Zlib enabled. Server Time: 2018-09-20 14:35:55 UTC