dumbwaiter

[gbarone]

I'm trying to repair a dumbwaiter, after replacing the reversing contactor, the motor will still not reverse, or go down. It stays in the forward or up direction.Any ideas?

 

[ptonsparky]

You did not get the wires connected properly on the the contactors. Assuming 3 phase the line connection on contactor one should be abc and contactor two should be cba. Single phase will reverse the two start winding leads in relationship to the run windings. (Danged if I can remember the #s right now. Getting old sucks.) Be ready to throw the safety switch because you may not have the direction of travel in correct relation to the limit switches. Breaks the hell out of things...or so I understand.

 

[gbarone]

Thanks for your response, what about 24 volts.

 

[ActionDave]

... Single phase will reverse the two start winding leads in relationship to the run windings. (Danged if I can remember the #s right now. Getting old sucks.)

Five and eight. But I would not expect to see numbers of the leads on the contactor, more likley different colors.

 

[ActionDave]

Thanks for your response, what about 24 volts.

Are you saying the switch that controls the dumb waiter is 24V?

 

[gbarone]

The system runs off a 24 volt transformer. Reversing contactor, over-current protection, and switches.

 

[ActionDave]

The system runs off a 24 volt transformer. Reversing contactor, over-current protection, and switches.

What do you mean by this? Surely the motor and circuit to it are not 24V, just the controls, right?

 

[gbarone]

Just the controls.

 

[ActionDave]

You have not described the switch that controls the dumb waiter. Is it momentary or maintain? How old is this dumb-waiter?

It seems like there is more than one contactor in the controls or a limit switch has something to do with reversing the motor.