In Reply to: single phase motor plugging posted by @utoconstruction on 05/25/00 at 10:41 AM:
: I found an industrial fan, a big one for my futur workplace.
: I must specify that it is in France.
: Apparently, it is possible to connect it as 220 v mono or 380 v tri
: I've verified and it is connected for 220 v. Good.
: There are one ground wire, one brown wire and TWO black wires.
: When I plug the brown wire and one of the black wire, the motor turns in
: one sense. The other black wire is NOT plugged anywhere.
: When I plug the OTHER black wire, It turns in the OTHER sense.
: THE PROBLEM : I have to manually throw the fan to make it turn !!!.
: The motor seems to be not strong enough at the start.
: Do I connect the motor correctly ?
: Is it necessary to plug the other black wire with the brown wire ?
: Self-builders on http://autoconstruction.free.fr
I think what you have is a 3-phase motor. The standard European wiring is brown is one phase and the two blacks are the other two phases. Blue is neutral and green with a yellow stripe is ground.
You don't have a neutral in your case. If you have a 3-phase motor and it turns in the wrong direction, you reverse the black wires to get the motor to reverse direction.