Connected wrongly....

[vincentv]

I have a motor which is 3 phase. The power connection has 4 wires which is L1,L2,L3 and E.
And the power source we have is a 5 connection supply which has L1,L2,L3,N and E.

I accidently connect the E wire to N of the supply, and turned the power on. The cause the workshop power supply to tripped. After turning on the main supply and do the connection correctly. E connection of motor to E of supply the motor is not working.

Just wondering what i did, by connecting the motor E wire to N supply has damaged the motor or burn the motor?

Cheers

 

[Darkwood]

If the motor was ok to start with then this would have only tripped an rcd device(if you had one upstream), but shouldn't trip an mcb and making the correction when you realised should have rectified it.
What tripped? What size and type is it? What size is the motor? Are you starting it Direct on line? Is it connected Star or Delta?

 

[vincentv]

That is the problem.. i dont know if the motor was ok or not to start with.
I think it was the main circuit breaker tripped. What is a RCD?
All i know is that the motor needs 460V 60Hz power supply.

Since the main circuit breaker tripped, this shouldn't have damaged or burn any fuses to the motor..

Correct me if i m wrong..

Cheers

 

[Darkwood]

Note! If you did as you say you did then it wouldn't have any adverse effect on the motor, do you get power to the motor now?

Where you from by the way 60hz isnt our normal 50hz is ours here in UK not that it makes any difference, an mcb or other type of fusing device trip with overload or short circuit and rcd monitors earth leakage so a link between N/E would trip this and they are commonly found at the front end of supplies so when they trip you lose power to multiple circuits.

 

[ian.settle1]

Note! If you did as you say you did then it wouldn't have any adverse effect on the motor, do you get power to the motor now?

Where you from by the way 60hz isnt our normal 50hz is ours here in UK not that it makes any difference, an mcb or other type of fusing device trip with overload or short circuit and rcd monitors earth leakage so a link between N/E would trip this and they are commonly found at the front end of supplies so when they trip you lose power to multiple circuits.

Agree where are you from, USA by any chance?

An RCD is the same as a GFLI

That is the problem.. i dont know if the motor was ok or not to start with.
I think it was the main circuit breaker tripped. What is a RCD?
All i know is that the motor needs 460V 60Hz power supply.

Since the main circuit breaker tripped, this shouldn't have damaged or burn any fuses to the motor..

Correct me if i m wrong..

Cheers

What do you mean by this comment the must be something wrong for the main breaker to trip in the first place.

 

[Darkwood]

Agree where are you from, USA by any chance?

An RCD is the same as a GFLI

I thought USA was 60hz but 220v 3phase

 

[vincentv]

I am from Brunei. We should have the same standard as the UK.

Now we are having problem with the motor not working. So need to verify what i did, is not the cause of failure.

Any explanation why the MCB tripped?

Cheers

 

[Darkwood]

I am from Brunei. We should have the same standard as the UK.

Now we are having problem with the motor not working. So need to verify what i did, is not the cause of failure.

Any explanation why the MCB tripped?

Cheers

If it was an mcb that tripped and not and rcd then it seems a fault must have already been there to start with,using a multi-meter and a insulation tester to confirm field coil resistance and insulation to earth would be a good next step,the connections you made would not have damaged the motor in anyway but their are other installation safety issues why it shouldnt be connected this way but as i said it wont have damaged the motor, we run at 50hertz 400/415 volt in UK so if you are the same then the motor is rated wrong to start with.

 

[vincentv]

Could the connection of E of the motor to N or the supply causing the MCB to trip?

After switching the E of motor back to E of Supply. This didn't trip the MCB..

Any explanation to this?

Cheers

 

[Darkwood]

Could the connection of E of the motor to N or the supply causing the MCB to trip?

After switching the E of motor back to E of Supply. This didn't trip the MCB..

Any explanation to this?

Cheers

As mentioned before this is the characteristics of an earth leakage device(rcd) and not and mcb and you said you lost alot of power to other circuits which again is common with rcd's and mcb normally protects individual circuits, was it a main switch that tripped which supplies a fuse board or an individual circuit mcb that tripped.
What is the kw rating of the motor?

How are you powering the motor is it 'Direct on line' so its runs straight away when you switch the isolator on or is it through a contactor with an overload on it and start/stop buttons.
Its possible the motor is rated to big and it took out the mcb on start up as well as the overload on the contactor, you may have switched the power on and not reset the overload, thus need to know motor rating kw for you supply, size of mcb that tripped, overload rating if fitted, is motor starting up on load or off load just to name a few questions also how are you turning motor on.
Without under-mining you it seems this is above you and with respect you shouldnt be doing this yourself if the above questions are not obvious to you as mistakes in this field can be costly but we will help where we can