dc contactor
dc contactor
(OP)
24VDC 1/2hp 60FLA Motor roughly 20s duty cycle
Having hard time finding a DC contactor(need reversing, but non will be ok for now).
If I use 2 SPDT contactors in parrallel (in order to reverse the motor), one passing the '+' and the other '-', would I be ok with a 400A NO / 200A NC inrush rating on the contacts?





RE: dc contactor
What is the off period?
DC contactors usually have a problem interrupting current - not closing. But at this low voltage, that shouldn't be a problem either.
What about using same kind of relay that is used in trucks and busses with 24 V system?
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: dc contactor
RE: dc contactor
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: dc contactor
I would peruse the robot places.
I googled for Power H bridge, (Which provides both directions!) The first site has 160A 50V H-Bridges.
http://www.robotpower.com/
(Look at their WEB Store)
Call them or hunt around I'm sure you will find exactly what you need AND in both directions without the clack, clack, clack, smoke, hassles.
With an H_Bridge you could use a OTS bit of brains to provide soft starting too! This would prevent frequent mechanical whacks to your machinery.
There is also Solid State Relays rated in those currents. You need to pay attention to their heat sinks and they will work well too.
http://www.power-io.com/products/hdd.htm
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: dc contactor
This link is typical of the British design of high current LV contactors: www.albright.co.uk
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Sometimes I only open my mouth to swap feet...
RE: dc contactor
RE: dc contactor
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: dc contactor
RE: dc contactor
Thank you AGAIN Keith!!
I'm surprised finding a seemingly simple solution to reversing a DC motor is such a pain....are low voltage ('high' current) DC motor systems just not that popular?