Can pump failure cause motor trip?

[chonglom]

My centrifugal pump cannot pump the fluid but it can buid pressure at discharge(I think it might be the shut off head since the pump performance drop is possible). But then the motor trip, pump shutdown. Can anybody tell me that why the motor trip?

Is it becuase off motor need to generate more torque or any reason?

thanks

 

[MikeHalloran]

Look at the HP curves superimposed on the PQ curves.



Mike Halloran
Pembroke Pines, FL, USA

 

[Pumpsonly]

Do you know how the motor was tripped?
Due to over current or due to some pump protection devices such as a flow switch or pressure switch?

 

[chonglom]

Motor trip becuase of heat. Thanks

 

[Pumpsonly]

Motor trip because of heat is due to over current/ over loading.
What type of pump and size of the motor.?
Normal centrifugal( radial and mixed flow) pump will not overload the motor at closed valve condition.

Are you running the pump is reverse rotation? Are you getting the correct shut off pressure at the discharge as per curve?

Any mechanical problem??
Can you rotate the pump shaft with freely.?

 

[willhammett]

I agree with pumps only, the only thing I will add is to check the motor fan.
Also, like he said check rotation, its very possible that the phases got messed up when reinstalling the pump.
If its heat and its tripping due to heat and not overcurrent directly at the breaker, it could have been shotty electrical work.
Is the coupling slipping? It could be stripped and motor has no mechanical load except friction from stripped coupling to motor shaft contact.

 

[Artisi]

Single or 3 phase motor?

Have you checked line voltage.
Checked for loose power connections.
Checked pump / motor free (easy) to rotate by hand.


It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

 

[waross]

This sounds like two different issues and one solution may not be appropriate.
If the pump is building pressure but there is no flow, there is probably a blockage in the flow or the pump is not developing enough head to overcome the static head.
Is this a new installation? Has any work been done on the system recently?
Did the pump work properly at one time in the present application?
What is the rated motor current?
What is the running current?
What is the setting on the overload devices?


Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[GTstartup]

Motor trip because of heat.. where? motor or pump? Is it tripping by overload (breaker)? or by process (RTD - Pump/Piping)?

 

[Pumpsonly]

thermister ...

 

[1gibson]

What type of motor, WPII? Inlet filters clogged?

 

[racookpe1978]

Many good recommendations to investigate.

And the original poster is ....?

 

[Artisi]

Absent, dead, inconsiderate.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)