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DC Motor forward / reversing and limit switches question
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Topic: DC Motor forward / reversing and limit switches question (Read 2139 times)
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Chris Wilson
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Race car engineer, dog lover, hoarder.
DC Motor forward / reversing and limit switches question
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on:
March 20, 2018, 07:19:04 pm »
I have a low RPM (planetary geared) 12V DC motor driven variometer in my LF transmitting set up, outside in the antenna loading coil enclosure. Whilst I know how to wire an in the house 3 way switch after the in house power supply, using a two core cable direct to the motor to forward and reverse it, that does not give me the over travel safety of a pair of limit switches. Is there any way to not have to use more than a two core cable to outside and have a pair of micro-switch limit switches on the variometer to stop over travel in either direction? I suspect not but have managed to get myself confused now
If I have to use a multi cored cable, what's the minimum number of cores I need to achieve this please? Thanks for any help!
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Andy Watson
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Re: DC Motor forward / reversing and limit switches question
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Reply #1 on:
March 20, 2018, 08:26:08 pm »
Is it a straight-forward DC motor - on/off control ? No PWM or such like?
Just put the two limit switches in series with the motor and bridge-out each switch with an appropriately oriented diode - such that it doesn't get stuck when it runs off the end.
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Chris Wilson
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Race car engineer, dog lover, hoarder.
Re: DC Motor forward / reversing and limit switches question
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Reply #2 on:
March 22, 2018, 05:46:52 pm »
Yes it's a basic DC motor run off a basic DC supply. thanks Andy, simple when you know how, that should be pretty straightforward to implement, appreciated!
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David_AVD
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Re: DC Motor forward / reversing and limit switches question
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Reply #3 on:
March 24, 2018, 11:29:05 pm »
I think this is what you're asking for?
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Chris Wilson
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Posts: 1081
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Race car engineer, dog lover, hoarder.
Re: DC Motor forward / reversing and limit switches question
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Reply #4 on:
March 24, 2018, 11:34:36 pm »
Thanks David, that's it, I am just putting the finishing touches to the mechanical mounting of the switches, cheers!
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Chris Wilson.
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