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Joined: Apr 2009
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I have a customer with a welding shop. When they weld aluminum they get high frequency interference into the phone system. I have shielded cable and jacks run to all phones with with all connections grounded. they also have 4 paging horns also on shielded cable. I am at a loss here to fix this problem.
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Joined: Jul 2004
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Other then putting all cabling in conduit and moving the system as far away as possible from all welding equipment. I don't have any other suggestions.
Scott
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Joined: Feb 2009
Posts: 3,136
Moderator-Vodavi, Vertical, XBlue
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Moderator-Vodavi, Vertical, XBlue
Joined: Feb 2009
Posts: 3,136 |
Bummer. Shielded cable is usually adequate. You could try clamp-on ferrite chokes or built a ferrite cage. If the interference is being induced through the AC, you could also add an AC Isolation Transformer.
- Dave S. -
You can never appease your ideologue opponents.
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Joined: Jan 2005
Posts: 15,398 Likes: 18
Moderator-Vertical, Vodavi, 1A2, Outside Wire
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Moderator-Vertical, Vodavi, 1A2, Outside Wire
Joined: Jan 2005
Posts: 15,398 Likes: 18 |
Also, you might want to use two-conductor line cords instead four conductor. The second pair can be picking up this interference and adding to the problem.
You really weren't clear on how this interference is affecting the system. If it is just coming through the speakers on the phones, you might try changing the "idle speaker mode" on the stations to see if that has any effect.
Ed Vaughn, MBSWWYPBX
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Joined: Jan 2008
Posts: 3,821
Retired Moderator
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Retired Moderator
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What does the interference do? If it is only affecting outside calls there are soms anti EFI modular devices that work well. I have used them in the past. I picked them up at Radio Shack.
www.myrandomviews "Old phone guys never die, they just get locked in some closet with an old phone system and forgotten about" Retired, taking photographs and hoping to fly one of my many kites.
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Joined: Apr 2009
Posts: 15
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Thank you all for your suggestions. The interference was causing the paging horns to go off, random line problems ect. I have a AC Isolation Transformer on there now to see if that fixes the problem. Ill keep you all posted
Ty again
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Joined: May 2003
Posts: 2,924
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Mike Sandman has a filters and a good tech paper. https://www.sandman.com/rf.html
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Joined: Apr 2009
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The AC Isolation Transformer worked.Sandman i'll keep your page marked for the filters thank you again all
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Joined: Apr 2009
Posts: 15
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Here we go again. The hf is still affecting the system it sets the paging horns and causes all the phone to go into hands free mode after about 30 sec of welding. Power conditioner still in place. Shielded cable to all paging horns and phones. clamp-on ferrite chokes in use still no resolution.
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Joined: Jan 2008
Posts: 3,821
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Retired Moderator
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Disconnect the co lines and see if it still happens. If so you need inline rf filters.
www.myrandomviews "Old phone guys never die, they just get locked in some closet with an old phone system and forgotten about" Retired, taking photographs and hoping to fly one of my many kites.
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