Today’s Tech: Making the Impossible Possible with RIBs® in Niche Applications
The thing I like most about handling Tech Support calls is hearing a customer say, "You probably don't have a solution for my application because I can't find anyone who does," and then actually having a solution for them. I can always visualize their contorted, yet enthusiastic facial response as they say, "Really?!" Chances are you have been in a tight spot at one time or another and a RIB® has gotten you out of it.
Problem: You have a device that outputs a 6Vdc pulse to turn a load on and a 3Vdc pulse to turn a load off using a maintained relay contact.
Solution: RIB it.
How do you go about that?
That is a pretty uncommon application, yet here at RIB® we received a call for just that. We pride ourselves on solving peoples' problems. Given the fact that there is a pulse instead of a constant voltage, my first thought was a latching relay.
Does anyone make a dual-voltage latching relay with 3V on one side and 6V on the other?
We do not, and I cannot think of anyone that does.
So what is an electrician to do when faced with this scenario?
I recommended the RIBMN24Q2C (2-stage staging relay) to control an RIBL24SB (mechanically-latching relay). I sent the customer a drawing to give him an idea of how it would work. When the RIBMN24Q2C has a voltage between 2.745V and 4.627V (3V in this application), Relay 1's contact closes which effectively applies 24V to the Unlatch coil of the RIBL24SB.
Likewise, when the RIBMN24Q2C has a voltage between 5.255V and 7.137V (6V in this application), Relay 2's contact closes which effectively applies 24V to the Latch coil of the RIBL24SB. I could have recommended the RIBL24B, but when an override switch is available, why not take it?