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 Post subject: 28 Power Issues
PostPosted: December 29th, 2008, 11:55 am 
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Joined: December 2nd, 2008, 8:10 pm
Posts: 34
Location: Bellevue, WA
I have a 28 rolling machine that, when plugged in, the voltage meter reads steady at 122V. When the switched is flipped to turn the motor on, the meter shows that the voltage is decreasing to about 105V and then the breaker is tripped.

I know the power supply is adequate.

Is this a sign that there is a short in the motor?

There was previous water damage inside the electrical box but all connections were dried and cleaned with caps replaced. I have also replaced the breaker due to repeated "popping".

Any help would be great.

Thanks

Eric


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 Post subject:
PostPosted: December 29th, 2008, 12:45 pm 
It sounds like the pump is overloading the motor causing it to draw too much current and trip the breaker.

You might check and ensure the sequence valve has not been adjusted on the pump (see pg. 2-4 in the operators manual - http://static.mcelroy.com/parts_finder/documents/2595.pdf?1173376915)

This sequence valve should not be adjusted up, as it will overload the motor.


Last edited by Jason on December 29th, 2008, 4:14 pm, edited 1 time in total.

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 Post subject:
PostPosted: December 29th, 2008, 3:37 pm 
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Joined: December 2nd, 2008, 8:10 pm
Posts: 34
Location: Bellevue, WA
How do I know if the Internal Sequence Valve has been tampered with?

What is the proper way of adjusting the Sequence Valve?


thanks

Eric


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 Post subject:
PostPosted: December 29th, 2008, 3:57 pm 
It does sound like you have a overload situation. Some questions:

What is the system pressure gauge reading? It should be relieved at 900 PSI.

Turn the facer on, What does the system pressure gauge read now? The voltmeter?


Did this issue just start all of the sudden? Was there other work done to this machine?


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 Post subject:
PostPosted: December 29th, 2008, 4:46 pm 
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Joined: December 2nd, 2008, 8:10 pm
Posts: 34
Location: Bellevue, WA
The pressure gauge is reading at 900psi. With the facer on it reads at about 300psi and trips the breaker much faster (2 sec). It still counts down though on the voltmeter from 122V to around 107V, then pops. Normally without the facer on this happens in a matter of 4seconds.

We have fiddled with the Sequence Valve to no avail.

This started happening on our last rental. The customer was of no real help in illuminating what could have caused this sudden problem. A few weeks prior I was getting minor shocks when I was touching the heater and then touching the machine as they were plugged into the same generator. We installed a ground plug for the heater thinking this was the cause and seemed to rectify this problem.

Any other suggestions would be much appreciated. Thank you.

Eric


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 Post subject:
PostPosted: December 29th, 2008, 5:30 pm 
Here are the potential causes that come to mind.

Hydraulic oil is too thick.
Possible plugged filter (though not as likely)
Change the fluid and filter


Bypass somewhere
Call me and I will walk you through this.

Motor trying to go out/poor connection
Disconnect the coupler between the pump and the motor and run the motor independent of the hydraulics. This should tell you if it is a hydraulic problem or electrical.

You mentioned water in the electrical box. Did it look like the machine had been partially submerged or was it more like condensation?


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 Post subject:
PostPosted: December 30th, 2008, 8:01 am 
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Joined: June 19th, 2007, 6:03 pm
Posts: 11
Location: texas
Have you tryed replaceing the breaker? Those breakers get weak after about 5 blows.


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