Relay or electronic switch

Thread Starter

andrewwallaceuk

Joined Oct 20, 2015
2
Hi Guys,

Complete newbie here so apologies for my ignorance in advance.

I have a project on the go at the minute and I'm a bit stuck. Basically I have a control board which operates a relay. I want this relay to operate a mechanical actuator. The problem is I need a neutral position with the actuator otherwise it is going to burn the motor out. At the moment I only have normally open or normally closed positions which I use to drive the actuator in one direction or another.

Is there such a thing as a three position relay in which I can have one position with no current flowing?

Thank you for your time in advance.

Andy
 

AnalogKid

Joined Aug 1, 2013
8,534
It sounds like the relay performs the reversing function, probably with DPDT (double-pole, double-throw) contacts. If so, a common solution is two SPDT relays controlled by a center-off switch.

ak
 

tracecom

Joined Apr 16, 2010
3,944
The OP said that the relay was to control a "mechanical actuator." I take that to mean that the motor direction is controlled by the position of this mechanical actuator and that the actuator makes and breaks the electrical connections to the motor to control its direction.
 

MrSoftware

Joined Oct 29, 2013
1,860
A couple of relays, or an H-bridge. Or you could use limit switches to stop the motor when the actuator reaches its end points. Combine with a fuse of some sort in case it gets stuck somewhere in between.
 
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