Question about microswitches :?: - Electronic Circuits Projects Diagrams Free

zippogeek · 23rd April 2004, 07:02 PM

Hi all,

Brand new to forum, respectfully asking for some guidance...

I need to toggle 2 wheelchair gearmotors (24vdc, 8A constant, 24A momentary) ON and OFF with microswitches that will be mechanically actuated by radio-control servo arms. My questions:

1. Can I use AC microswitches on a DC application? It seems like practically all the MSs out there are AC and are designed for toggling signals (in the mA range) as opposed to "power-on" applications.

2. Since AC power is typically of high voltage, can I run a switch rated at say 115VAC on 24VDC, but at a higher amperage (24A)?

3. Do I make any sense whatsoever? :roll:

Thanks to anyone willing to shed some light,

Jason

ante · 23rd April 2004, 07:24 PM

Hi zippogeek

Microswitches for both AC and DC are typical marked like 16 AmpAC 0.3 AmpDC this is because there is a problem when you open (brake up) a DC current. The DC will arc and burn the contacts in the M switch.

Ante :roll:

Russlk · 23rd April 2004, 07:55 PM

One solution to your problem would be to use the microswitch to turn on a MOSFET switch which will handle the current.

gerty · 23rd April 2004, 08:35 PM

Taking from Russlk solution you could use the radio reciever to directly gate the mosfet switches possibly eliminating the need for the servo
motor altogether..

ante · 23rd April 2004, 11:34 PM

The microswitches can control some relays cheapest are automotive relays. There is perhaps another problem to take care of. When switching on a motor like this the current is very high especially if there is a mechanical load involved. Are you sure you want to just switch on and off, not having any kind of regulation of the rpm.
BDW, 24Volts automotive relays are used in trucks and busses.

Ante :roll:

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23rd April 2004, 07:02 PM	(permalink)
zippogeek	Question about microswitches :?: Hi all, Brand new to forum, respectfully asking for some guidance... I need to toggle 2 wheelchair gearmotors (24vdc, 8A constant, 24A momentary) ON and OFF with microswitches that will be mechanically actuated by radio-control servo arms. My questions: 1. Can I use AC microswitches on a DC application? It seems like practically all the MSs out there are AC and are designed for toggling signals (in the mA range) as opposed to "power-on" applications. 2. Since AC power is typically of high voltage, can I run a switch rated at say 115VAC on 24VDC, but at a higher amperage (24A)? 3. Do I make any sense whatsoever? :roll: Thanks to anyone willing to shed some light, Jason

23rd April 2004, 07:24 PM	(permalink)
ante	Hi zippogeek Microswitches for both AC and DC are typical marked like 16 AmpAC 0.3 AmpDC this is because there is a problem when you open (brake up) a DC current. The DC will arc and burn the contacts in the M switch. Ante :roll:

23rd April 2004, 07:55 PM	(permalink)
Russlk	One solution to your problem would be to use the microswitch to turn on a MOSFET switch which will handle the current. __________________ see my website: www.geocities.com/russlk

23rd April 2004, 08:35 PM	(permalink)
gerty	Taking from Russlk solution you could use the radio reciever to directly gate the mosfet switches possibly eliminating the need for the servo motor altogether.. __________________ gerty

23rd April 2004, 11:34 PM	(permalink)
ante	The microswitches can control some relays cheapest are automotive relays. There is perhaps another problem to take care of. When switching on a motor like this the current is very high especially if there is a mechanical load involved. Are you sure you want to just switch on and off, not having any kind of regulation of the rpm. BDW, 24Volts automotive relays are used in trucks and busses. Ante :roll: