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varunpassi
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Crane Bridge Service Factor

06/14/2012 7:22 AM

hi there,

i cam across this term Plugging while sizing the motor for trolley as per IS 3177 in Table 21B Values for service factor. can some one enlighten me on this as to what is plugging in cranes??? thanks in advance.

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PMoon
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#1

Re: Crane Bridge Service Factor

06/14/2012 7:31 AM

According to Engineered Material Handling's Glossary of Terms:

Plugging: A control function which accomplishes braking by reversing the motor line voltage polarity or phase sequence.

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varunpassi
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#3
In reply to #1

Re: Crane Bridge Service Factor

06/15/2012 2:31 AM

thank u very much.

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ozzb
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#2

Re: Crane Bridge Service Factor

06/14/2012 7:51 AM

Like most motors they don't like it when going full speed in one direction someone switches to the other with out coming to a stop. So they have circuitry that does it. Pulses to the motor braking the direction of travel until it stops. This is plugging.

Usually found of equipment where an operator has control of directional motion and speed. Fork lifts and cranes are a few.

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varunpassi
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#4
In reply to #2

Re: Crane Bridge Service Factor

06/15/2012 2:31 AM

thank u very much.

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Wal
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#5

Re: Crane Bridge Service Factor

06/16/2012 4:52 AM

So, "plugging" is another word for dynamic braking/holding.....

Why is it called "plugging" I wonder?

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