DC MCC question
DC MCC question
(OP)
Hey everyone. I am an engineer working on replacing an existing DC MCC for a client. It has been almost impossible to find a manufacturer that even makes DC MCC's. I just need a 3 cabinet, around 6 section DC MCC. Some of the sections include Aux Fuel Pump, DC Starting Resistors, Aux lube pump, and an Aux evactor blower. I know Cutler-Hammer has a DC MCC but doesn't deal with Aux fuel pumps, DC staring resistors, or the lube pump. Someone suggested I might get a panel shop to to put it together and just put the motor starters in there. Can anyone suggest a good course or action I could look into? Thanks for your time.





RE: DC MCC question
"Our virtues and our failings are inseparable, like force and matter. When they separate, man is no more."
Nikola Tesla
RE: DC MCC question
DC gear takes up as lot more physical room than an equivalent AC rated board. Contactors are bigger, thermal overloads are hideously expensive, resistor banks occupy space...
A-B's 810 series thermal O/L is one of the few available in the UK without spending a serious amount of money. Treat the ratings of AC contactors on DC service with extreme scepticism: in my experience they have short lives and violent deaths when used on DC inductive loads. For preference use a bar & shaft contactor fitted with a magnetic blowout. Same applies to breakers: most require multiple poles in series to get any significant breaking capacity unless you are using very low voltage.
This sounds vaguely like a turbine application from the drives you are wanting to power. If this is the last-ditch protective system, remember that simpler is usually better.
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If we learn from our mistakes,
I'm getting a great education!
RE: DC MCC question
http://afctool.com/
We would be willing to look at your application and if it falls within our capabilities make you a proposal. If you wish to pursue our help contact me.
David Baird
Electrical/Controls Designer
AFC Tool Co.
davidb@afctool.com
937-275-8700
David Baird
mrbaird@hotmail.com
Sr Controls Designer
EET degree.
Journeyman Electrician.
RE: DC MCC question