I was reviewing the aeroelectric book and their Z31B ground power solution.
I was wondering if everyone sees this the same way. Once ground power has been applied with correct polarity the diode will allow the coil to clopse the contactor. Once ground power has been removed however, unlike the Z31A drawing the B mechanism will keep the contactor self energized.
To break this you would need to use the switch-breaker (bottom of the schematic) to disengage the contactor.
I was wondering if everyone sees this the same way. Once ground power has been applied with correct polarity the diode will allow the coil to clopse the contactor. Once ground power has been removed however, unlike the Z31A drawing the B mechanism will keep the contactor self energized.
To break this you would need to use the switch-breaker (bottom of the schematic) to disengage the contactor.