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KEDU KOA8 - 3 Phase Motor Solenoid Switch Issue: Engine Stops After Starting, Wiring Error?

karolakpiotr 14124 5
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  • #1
    karolakpiotr
    Level 9  
    I bought a solenoid switch for a 3 phase motor. I connected the power supply to the terminals from the "a" side and the "motor from the" b "side.
    After pressing the button the engine started, but when it starts the engine stops. I swapped the power supply with the receiver, but still the same. Is it possible that I connected something wrongly, or rather a faulty switch? KEDU KOA8 - 3 Phase Motor Solenoid Switch Issue: Engine Stops After Starting, Wiring Error? ? KEDU KOA8 - 3 Phase Motor Solenoid Switch Issue: Engine Stops After Starting, Wiring Error? KEDU KOA8 - 3 Phase Motor Solenoid Switch Issue: Engine Stops After Starting, Wiring Error?
    [07.10.2023, Warszawa] Eltrox Technology Expo [sponsorowane]
  • Helpful post
    #3
    januszx3
    Level 31  
    Insert the contactor into the housing correctly, so that the green push button activates and the red switches off (the on and off functions are mechanical), as in the attached illustration (another model):
    KEDU KOA8 - 3 Phase Motor Solenoid Switch Issue: Engine Stops After Starting, Wiring Error? , after switching on, the electromagnet maintains the switching functions, ... until the voltage drops. The supply voltages must be correct (and above all the voltage supplied to the solenoid coil) ... and this is a necessary condition for maintaining the on state.
    Additional technical information (replacement for KOA8) is here: link .
  • #4
    karolakpiotr
    Level 9  
    I connected it in such a way that I connected the power supply phases to terminals 7.5.3 and bridged terminal 5 from 1. Connect the motor to terminals 8, 6, 4. I didn't connect zero at all.
    Under the markings a and b there are no terminals, there are thin plates hidden in the housing - as if the male part of a tiny connector.
    The engine still starts after pressing the button, but immediately stops when released.

    Can the phase connection order matter?
  • Helpful post
    #5
    goldi74
    Level 43  
    karolakpiotr wrote:
    Can the phase connection order matter?

    It should not matter. What matters is the fact that contacts a and b are not connected. They are the contacts of the holding solenoid coil and they must be connected as per the diagram. Just 2 short wires terminated with matching connectors.
  • #6
    karolakpiotr
    Level 9  
    goldi74 wrote:
    karolakpiotr wrote:
    Can the phase connection order matter?

    It should not matter. What matters is the fact that contacts a and b are not connected. They are the contacts of the holding solenoid coil and they must be connected as per the diagram. Just 2 short wires terminated with matching connectors.


    Bingo! For now, connected for a short time, because the connectors slightly smaller than the standard ones did not fit into the hole, but it works!

    Thanks to everyone for your help! :-)
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