We have a mobile belt conveyor driven by a 380V three phase motor.There are two separate lines of conveyors in a conveying system. The mobile conveyor is running in forward direction in one line but why it is in the reverse direction on the other line? What could be the causes?

  • \$\begingroup\$ Does each section have a separate three phase motor? \$\endgroup\$
    – Justme
    Commented Jan 5, 2022 at 5:54
  • \$\begingroup\$ Yes, the two lines are in parallel using separate three phase motors. \$\endgroup\$ Commented Jan 5, 2022 at 6:23

1 Answer 1


One of the motors is connected differently to three phase mains so it runs in different direction.

Some 3 phase mains plugs contain a switch to swap 2 phases to change direction of motors.

  • 1
    \$\begingroup\$ ... and even without a switch, swapping two of the phases always reverse the direction. \$\endgroup\$
    – fraxinus
    Commented Jan 5, 2022 at 7:34
  • \$\begingroup\$ The actual is three motors in sequence) are in one source only. The reverse rotation happened in 2 of the 3 motors. Why? \$\endgroup\$ Commented Jan 5, 2022 at 9:56
  • \$\begingroup\$ @BombodiPerj There must be a wiring difference in some connections between motor and the one power source you mention. \$\endgroup\$
    – Justme
    Commented Jan 5, 2022 at 10:49

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