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Old 04-17-2019, 05:23 AM   #1
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Default 40T crane overload trip on auxiliary hoist motion

Hi am working on a 40T Wolff Crane....recently the auxiliary motion started tripping out on overload, if you reset it,it runs for a bit but trips again

So far in fault finding i have changed all directional contactors i have mega tested the cables
I am about to just change the motor what could be the issue here

Thanks for your contributions in advance
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Old 04-17-2019, 11:55 AM   #2
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Overload is the clue. I would have started at the motor first.
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Old 04-17-2019, 08:10 PM   #3
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Originally Posted by John Valdes View Post
Overload is the clue. I would have started at the motor first.

Did you put an amp clamp (amperage meter) across any of the 3 leads to the motor? This is my first step and it lets U know what direction to go next.
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Old 04-17-2019, 10:38 PM   #4
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Funny thing is its drawing normal current for a motor its size
I have changed the motor so far so good
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Old 04-19-2019, 09:57 PM   #5
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Funny thing is its drawing normal current for a motor its size
I have changed the motor so far so good
Overloads might have been set to low/sensitive.

Now, run the unit back and forth and over and over to get it warmed up.
If it drops out again, look at the overload relays. In the old days, this is the first item to wear out or be incorrect on a contactor from my experience.
Describe more of "auxiliary motion"
Is this a secondary hoist on a bridge with a primary hoist of higher capacity?
Is there a resistor bank controlling the speed of unit?
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Last edited by stiffneck; 04-19-2019 at 09:59 PM. Reason: just remembered
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