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Author Topic: little aid needed with hoists and PA  (Read 1677 times)

Stephane Papadopoulos

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little aid needed with hoists and PA
« on: December 23, 2011, 12:40:52 pm »

Dear all,

I'm at a gig with a small moving platform, what is moving with an hoist.
the hoist is fed by a 32A400V, that is separated from the audio power.
Every time the hoist must go up or down, we hear the relay from the hoist click in the PA.

I have tried to put a transfo between the neerest micro and the patch, but no result...

Does anybody of you have a solution?

Thx for helping!

Stephane!
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Hayden J. Nebus

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Re: little aid needed with hoists and PA
« Reply #1 on: December 23, 2011, 02:19:38 pm »

Dear all,

I'm at a gig with a small moving platform, what is moving with an hoist.
the hoist is fed by a 32A400V, that is separated from the audio power.
Every time the hoist must go up or down, we hear the relay from the hoist click in the PA.

I have tried to put a transfo between the neerest micro and the patch, but no result...

Does anybody of you have a solution?

Thx for helping!

Stephane!

It's likely you are on a seperate disconnect that shares service with the hoist. Seperate power for audio refers to a service that is typically transformer isolated.
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Bob Cap

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Re: little aid needed with hoists and PA
« Reply #2 on: December 24, 2011, 11:45:32 am »


What you're hearing is the arc from the relay contacts making and breaking the connection.

Years ago we would put a capacitor across the contacts of a relay to keep them from arcing.

Without having them here to work on I would not even venture a suggestion as to the size and voltage of the correct capacitor to use...

Maybe just mute the pa?

The motors/pa rig we use does not exhibit this problem...

Good Luck

Bob Cap
Advanced Audio Inc.
Gilbert, MN
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Stephane Papadopoulos

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Re: little aid needed with hoists and PA
« Reply #3 on: December 28, 2011, 04:38:39 pm »

Hi,

sorry for the late reply!

it's an old motor.. explains maybe a lot :-)

the problem has been resolved by changing the relay.

Thanks anyway!

stephane
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Re: little aid needed with hoists and PA
« Reply #3 on: December 28, 2011, 04:38:39 pm »


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