I have a 1.5kW 220VAC 1 Phase dust extractor. It's controlled by what looks like a DOL switch KJD17B/5T (so I assume the 5th terminal is an overload).
Wiring diagram on duct collector:
From what I can see it's DP/ST and has L/N In and L/N Out and then a 5th connection form the motor which I can only assume is some sort of overload.
I'd like to add a remote start/stop, but it looks like the KJD17B is an enclosed device so I can't wire my remote start/stop in parallel/series.
I'd welcome advice on how to achieve my remote start solution? Should I try to re-wire the DC and bypass the KJD in favour of two external DOL start/stop controllers?
Best Answer
The fifth connection is under-voltage lock-out - notice the symbol "U<" in the little box on the switch: -
It also tells you on page 1 of the data sheet that there is a feature that prevents restarts should the AC fail. That connection is associated with that feature and, maybe the connection to the motor is because there is an over-temperature contact in the motor that can also trip the magnetic relay internally.
This makes adding a remote start/stop circuit somewhat problematic but, if you are fit for the task, the new start/stop circuit would need to come down stream of the KJD17B and could be the conventional self-latching relay circuit and wouldn't need to be double pole: -