Lift Motor Wiring Backwards?

[bobbydd21]

Got the lift hydraulics connected and the motor power connector wired, but no oil is getting pumped through. I've read through the forums and it seems it's not too uncommon for the motors to be wired backwards. Can anyone tell if this is the case here, and if so, which two wires need to be swapped? I am not extremely savvy with wiring, but one thing that caught my attention is that the red wire coming from the motor is screwed in across from the blue wire, and then on the output the blue wire gets connected to blue and the brown to red. Thanks in advance!

 

[The Cobbler]

All I see is a terminal block connecting the 2 leads from the motor to the supply leads. then a red wire that loops in & out of the motor?

 

[rockettauto]

Cant tell for sure if it's backward since we don't know what the lead wires go to ( I would guess it is , since it just makes more sense to have brown to red and blue to black) but if it is you would just swap the position of the blue and brown on the block, or the red and black....either way will achieve the same thing electrically.

 

[bobbydd21]

All I see is a terminal block connecting the 2 leads from the motor to the supply leads. then a red wire that loops in & out of the motor?

Cant tell for sure if it's backward since we don't know what the lead wires go to ( I would guess it is , since it just makes more sense to have brown to red and blue to black) but if it is you would just swap the position of the blue and brown on the block, or the red and black....either way will achieve the same thing electrically.

Sorry, was uploading the rest of the pictures. The leads make their way to the switch and then out of the switch to the wall connector.

 

[The Cobbler]

by switching the motor leads shown won't reverse the direction it spins. it's an AC motor . if that motor is reversible, there would be additional wires that switch the field winding's to reverse it .

 

[bobbydd21]

by switching the motor leads shown won't reverse the direction it spins. it's an AC motor . if that motor is reversible, there would be additional wires that switch the field winding's to reverse it .

Again, not an expert on this, but from what I’ve read because it’s a 3 phase AC motor it can be reversed by swapping the leads. Is that not correct?

 

[mm08822]

by switching the motor leads shown won't reverse the direction it spins. it's an AC motor . if that motor is reversible, there would be additional wires that switch the field winding's to reverse it .

I'm not so sure of that. This snip shows a dc rectifier bridge.

Disconnect the motor leads and read the voltage when contactor energized. I would expect (nothing certain with CHiChom) red is + and black is - at the motor. Maybe you have swapped the polarity of the wires feeding red/black..

 

[The Cobbler]

I don't think you have a 3 phase motor tho

 

[mm08822]

I don't think you have a 3 phase motor tho

Definitely not, only 2 wires to the motor and on the contactor.

 

[BillK]

Got the lift hydraulics connected and the motor power connector wired, but no oil is getting pumped through. I've read through the forums and it seems it's not too uncommon for the motors to be wired backwards. Can anyone tell if this is the case here, and if so, which two wires need to be swapped? I am not extremely savvy with wiring, but one thing that caught my attention is that the red wire coming from the motor is screwed in across from the blue wire, and then on the output the blue wire gets connected to blue and the brown to red. Thanks in advance!

Do you have an actual wiring diagram ?

 

[rockettauto]

Yep true... It's a single phase , I hadn't noticed the caps being side mounted on the motor.

A single phase will reverse by changing which coil the caps are in series with, I was thinking they were remote mounted but they aren't.

In this case I very much doubt your wiring is the problem.

Pump may have a check ball stuck or something.

 

[bobbydd21]

Yep true... It's a single phase , I hadn't noticed the caps being side mounted on the motor.

A single phase will reverse by changing which coil the caps are in series with, I was thinking they were remote mounted but they aren't.

In this case I very much doubt your wiring is the problem.

Pump may have a check ball stuck or something.

Do you have an actual wiring diagram ?

I don't think you have a 3 phase motor tho

Definitely not, only 2 wires to the motor and on the contactor.

I do have the wiring diagram. I’ll post it when I get home. The reason I thought it was a 3 phase motor was because the model on the motor is ys90l-2, which when I googled comes up as a 3 phase motor.

 

[wyliesdiesels]

Again, not an expert on this, but from what I’ve read because it’s a 3 phase AC motor it can be reversed by swapping the leads. Is that not correct?

Thats definitely not a 3 phase motor. 3 phase motor would have 3 hot lines coming in...

 

[wyliesdiesels]

I do have the wiring diagram. I’ll post it when I get home. The reason I thought it was a 3 phase motor was because the model on the motor is ys90l-2, which when I googled comes up as a 3 phase motor.

Post a pic of the motor nameplate

 

[bobbydd21]

Post a pic of the motor nameplate

Do you have an actual wiring diagram ?

Here’s what I have for a motor and wiring diagram.

 

[rockettauto]

Well your diagram is for a 380 or 220v three phase motor but your motor is 110v single phase.

It's not a wiring thing.

I'd first see if you can peep in the tank to see the pickup tubes are attached and adjust that release solenoid out until you're certain it's not pushing the release valve.

Check your hose connections. Not sure what type it is but some are possible to have attached but not enough to open em up. Also feel to see if the hose stiffens or has any perceivable movement when you run the motor.

 

[wyliesdiesels]

Here’s what I have for a motor and wiring diagram.

Well that motor nameplate clearly says single phase

Wiring diagram doesnt match motor

 

[mm08822]

Here’s what I have for a motor and wiring diagram.

Clearly, motor namplate doesn't match wiring diagram. WD shows partial dc control circuit.

Let's start by measuring the voltage applied to the motor. Hopefully 110-120vac.

Or measure voltage at lineside of contactor.

 

[dogdog]

Might be one of those 3ph motor wired to use a single phase in Delta and capacitors to shift the phase of the voltage. If you zoom in to the motor connections, you'll see marking of U1 V1 W1 and U2 V2 W2. ignore the control transformer and the rectifier.

There is a thread earlier last year or two with some one configuring it and asking for the capacitor value.


maybe the OP should map out how the caps are connected and see.

This is just for reversing an 3ph motor. not necessary the OP's problem.

 

[txvwnut]

I had one that did the same thing and what I did was took the motor apart and turned the wiring canister 180 degrees.

 

[bobbydd21]

Well I decided to just try reversing the terminals and lo and behold it worked haha. No idea why though. Figured that red should probably just go to red though and not blue…

Anyways, hoping no damage was done to the pump. Only ran the motor for about 20 seconds total in the wrong direction and seems to be working fine now.

 

[rockettauto]

Cool, that's an odd one...was it actually spinning up to full speed before?

 

[bobbydd21]

Cool, that's an odd one...was it actually spinning up to full speed before?

Yup, it would spin up and then after a few seconds start to big down like there was too much pressure and no oil came out of the hose.

 

[rockettauto]

Is this a pair of wires going into the motor at another spot?

 

[bobbydd21]

Is this a pair of wires going into the motor at another spot?

No, those wires are going into the electro-magnetic valve.

I sadly still have not figured out how the lift is suppose to connect into this. I believe that a connection is missing (made a post about this in a different sub forum). Waiting to hear back from the company.

 

[rockettauto]

No, those wires are going into the electro-magnetic valve.

I sadly still have not figured out how the lift is suppose to connect into this. I believe that a connection is missing (made a post about this in a different sub forum). Waiting to hear back from the company.

I'm pretty puzzled how they have it wired to where it would reverse like that, only thing I can think of is if they have one coil actually using the frame ground and the centrifugal switch then crossed the connection to change what the caps are in series with. Oh well, it works!

What do you mean by connect into it?

I know on most two posts that would be a manual lever in that spot. Once it's pressed the fluid is just allowed to flow back in under the lifts own weight, through the single hydro line. If it clicks for you it's probably just adjusted out too far if it won't release the lift down.

But is yours like a scissor type floor lift? Those I'd be more lost with, I have one, but have never had to figure out it's workings.

 

[bobbydd21]

I'm pretty puzzled how they have it wired to where it would reverse like that, only thing I can think of is if they have one coil actually using the frame ground and the centrifugal switch then crossed the connection to change what the caps are in series with. Oh well, it works!

What do you mean by connect into it?

I know on most two posts that would be a manual lever in that spot. Once it's pressed the fluid is just allowed to flow back in under the lifts own weight, through the single hydro line. If it clicks for you it's probably just adjusted out too far if it won't release the lift down.

But is yours like a scissor type floor lift? Those I'd be more lost with, I have one, but have never had to figure out its workings.

Yeah that makes sense. I honestly thought it was not going to work switching them, but figured it was worth a shot. Very strange.

Yes it’s a scissor floor lift with apparently an “electric safety release”? Not sure what that means. But this connector is coming out of the lift and there is absolutely no where to plug it into on the console side. Kind of worried trying to put the lift up without this connected because I’m afraid I won’t be able to release it easily.

 

[rockettauto]

Yeah that makes sense. I honestly thought it was not going to work switching them, but figured it was worth a shot. Very strange.

Yes it’s a scissor floor lift with apparently an “electric safety release”? Not sure what that means. But this connector is coming out of the lift and there is absolutely no where to plug it into on the console side. Kind of worried trying to put the lift up without this connected because I’m afraid I won’t be able to release it easily.

If it works like mine it means it will come down only so far, then you have to let off and press it again.

With the mismatched and incomplete wiring diagram there it's impossible to tell.