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Winding Diagram for 3 phase 2 Speed Induction Motor

09/25/2014 11:35 AM

We have two three phase two speed motors for Heavy duty crane.

Name plate: 1.5 kW / 9.5 kW, 400 V, 50 Hz, Y/Y, 9.3/19.8 A, P.F 0.54/0.87, 455/2865 RPM SIEMENS

One of the motor is burnt. When the motor is re -winded

1. High Speed side: 9.5 kW, 400 V, 50 Hz, 19.8 A, P.F 0.87, 2865 RPM (OK)

Working fine and current is in limits.

2. Low Speed side: 1.5 kW , 400 V, 50 Hz, Y, 9.3, P.F 0.54, 455 RPM (Problem)

Under no load condition, it consumes 20 A (which is too large)

There is abnormal sound and heating of motor.

Please suggest winding diagram to solve the issue of high current.

If anybody has any knowledge on this type of motor winding, I shall be grateful.

It is re-winded according to the following winding diagram.

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#1

Re: Winding Diagram for 3 phase 2 Speed Induction Motor

09/25/2014 11:45 AM

Have you spoken to the crane manufacturer, Mildred? If not, why not? Did you source a replacement motor? If not, why not? What do your collapse indemnity insurers have to say about this crane? If the motor is shot then the rest of it might be beyond salvage too.

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Associate

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#2
In reply to #1

Re: Winding Diagram for 3 phase 2 Speed Induction Motor

09/25/2014 12:06 PM

Hoping logical and solution oriented questions from your side.

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#4
In reply to #2

Re: Winding Diagram for 3 phase 2 Speed Induction Motor

09/26/2014 7:42 AM

Scrapping it is a solution. Hoping for some sense from your side.

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#3

Re: Winding Diagram for 3 phase 2 Speed Induction Motor

09/25/2014 6:55 PM

Given that the motor is for crane duty I'm going to back Officer Crabtree. Source an OEM motor or get it repaired by a reputable rewind house.

Crane motors are subject to regular overloads and arduous duty. I don't know where you're based but in the UK there's only a couple of rewind houses I'd trust to do the work even though it involves paying premium prices.

René Artois

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Active Contributor

Join Date: Sep 2014
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#5

Re: Winding Diagram for 3 phase 2 Speed Induction Motor

09/26/2014 1:31 PM

Sounds like you have a bad OL or contact in your low speed motor controller. Be sure to check each fuse.

1, Make sure your Over Loads are completely reset. You can push the reset button but a bad OL will not reset. Turn power off and conduct a DC resistance check on each OL thermal heater.

3, With the power off, check each fuse with a DC Ohm meter and again with the power on with each phase, voltage to ground.

2. Check the controller contacts. Remove and mark the low speed motor leads. Force the low speed controller ON (usually by hand) and check each phase voltage to ground at both the controller and the motor if necessary.

This will eliminate a controller or power related problems. Good Luck.

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#6
In reply to #5

Re: Winding Diagram for 3 phase 2 Speed Induction Motor

09/27/2014 12:00 AM

Have you ever actually worked on a crane?

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#7
In reply to #6

Re: Winding Diagram for 3 phase 2 Speed Induction Motor

09/27/2014 12:25 AM

Both AC and DC. Why?

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Participant

Join Date: May 2021
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#8

Re: Winding Diagram for 3 phase 2 Speed Induction Motor

05/17/2021 4:40 AM
  1. Hi I have just rewound a larger 2 speed motor from a stahl crane motor made by Siemens do you still need help with yours?
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#9
In reply to #8

Re: Winding Diagram for 3 phase 2 Speed Induction Motor

05/17/2021 11:24 AM

If he hasn’t figured it out in 7 years, it’s probably no longer important.

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Anonymous Poster (1); Crabtree (2); JRaef (1); KeithMorin (2); Michael petrie (1); Salar (1); TonyS (1)

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