What would happen if both relays turned on at the same time? I understand it shouldn't and would try to avoid that but what if it did? It would be 12v 2A.
Why would it be any different if right now both relays are off?
It's hard to understand your picture without labels on the relay contacts. For your next projects learn to draw abstract circuit diagrams.
I guess that the motor is powered only if one of the relays is on. Nothing happens if none or both relays are on.
Sorry here is a labeled picture. When relay one is active it extends the actuator and when relay two is active it retracts the actuator. I just wanted to make sure it wouldn't short or cause a safety issue if both relays went active at the same time.
Thanks for picture, but I have to ask again! What happens now when both relays are off?
Ok so I see it now. Basically if they are both open or closed its the same effect. thanks
Using this partial schematic:
- no relays operated - both motor terminals connected to 0V - motor stationary
- only RH relay operated - motor connected to 0V and +12V - motor runs
- only LH relay operated - motor connected to +12V and 0V - motor runs in reverse
- both relays operated - both motor terminals connected to +12V - motor stationary
With both relays operated the motor remains stationary, no high/damaging current flows, so it is safe to do.
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Good for you! You got it.
Excellent example of where a circuit diagram makes it clear & immediately obvious - where just a block diagram doesn't!
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Your two (SPDT) relays actually form an "H bridge". Solid state versions of H Bridges arre often also used for controlling reversible DC motors for example the L298 and many modern equivalents.
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