Chassis Problem

[Mr. 800-R]

Chassis on lane 3 started interlocking. Put on bench, checked terminals, installed a ss contactor. Still interlocked.

Swapped Omega boards, cleaned chassis, now when I put power to chassis ......the t contactor chatters.

What makes a t contactor chatter and arc?

Guru

[Kat]

Re: Chassis Problem

What happens when you put another known good chassis on this machine?

If same thing, check condition (resistance) of table 24VAC toggle on control box.

Let us know where you're at.

[Mike Stalker]

Re: Chassis Problem

If you haven't already, clean your C1 pins very well. I use contact cleaner and a thin bristled brass brush, then another spray and a synthetic brush.

If you changed any pins in the C1 and pulled it out make sure all your ground wires were put back onto the ground strap adjacent to the C1 & C2a.

If this doesn't work you could have leakage through a crack in the C1 plug.

Good Luck

[Mr. 800-R]

Re: Chassis Problem

If I put another chassis on the machine it runs fine.....

Also this chassis chatters on more then one machine.

[TheGMan143]

Re: Chassis Problem

If you still have your old Frameter or control desk switches installed, check the switch that controls that lane for a possible short, also check the AM&C box wiring for shorts... if the machine is started up in 'Bowl' from the scoring, but the switch is in the 'Practice' (Instructomat) position, or shorted into that position, it will cause the contactors to chatter and throw sparks.

You might have a couple wires that are shorting intermittently and causing the interlock problem by stopping the sweep or table and throwing them out of sync.

I've also seen wires get trapped under the actuator block on the older Allen-Bradley contactors. With a wire trapped, the contactor does not seat into it's full-on position, and it will buzz or chatter.

Just a thought...

[Dutch]

Re: Chassis Problem

When using Omega Tek MK-70”s in a solid state chassis, the most common cause of TBL & SWP contact chatter is a bad component on the heat sink assy. Usually it's one of the power diodes but I guess a bad varistor could cause it too.

Set your ohm meter on its highest setting (or midrange if you have a good meter that reads Mega-ohms) & test the 2 outside diodes (in both directions). They should read the same. Then test the one in the middle. It should read the same as the others but with reverse polarity. I've never found a way to test the varistors with a meter.

If your chassis uses Elco mask plugs, check the terminals at 2 & 28. Those are the terminals to the mask switch. I had one last week that had chatter caused by a loose #2 terminal, where it solders to the mother board. The easiest way to check that is to put the chassis on the machine. With the power on, wiggle the mask plug. If the decklight & BE motor sputters, you've found your problem.

[img]/content/btubb/images/%%GRAEMLIN_URL%%/usflag.jpg[/img]

[the old dirt man]

Re: Chassis Problem

when is it chattering at zero during spotting [img]/content/btubb/images/%%GRAEMLIN_URL%%/confused.gif[/img] all the time. was it chattering before you changed contactor. CRUDO

[Mr. 800-R]

Re: Chassis Problem

It is not chattering during spotting.....it does it as soon as power is turned on.

I will dig into it next week.

[the old dirt man]

Re: Chassis Problem

GURU,
I would check the power diode on the heat sink I'LL bet it's shorted [img]/content/btubb/images/%%GRAEMLIN_URL%%/confused.gif[/img] but first drop the chassis in the floor a few times that might just stop the chattering. [img]/content/btubb/images/%%GRAEMLIN_URL%%/eek.gif[/img] CRUDO

[Jimmy Jam]

Re: Chassis Problem

10vdc power supply. Try swopping out CP1. Thats the capacitor that sets in the corner under the 3 fuses.

WARNING: This is only a guess. Any damage done to the affore mentioned CP1 by swopping it out with another one lies soeley in the hands of the technician. By swopping out CP1 you agree that JJ has no clue about Omega-Tech products and is only responding to the question because nothing is good on T.V. tonight.

[8270king]

Re: Chassis Problem

Is the heat sink under the transformer?

Jerry

[John_Galt]

Re: Chassis Problem

JJ's voice:
"By swopping out CP1 you agree that JJ has no clue about Omega-Tech products and is only responding to the question because nothing is good on T.V. tonight."

ROFL!!!! [img]/content/btubb/images/%%GRAEMLIN_URL%%/laugh.gif[/img] [img]/content/btubb/images/%%GRAEMLIN_URL%%/laugh.gif[/img] [img]/content/btubb/images/%%GRAEMLIN_URL%%/laugh.gif[/img]

As for the problem: Woah, good luck! Out of my league! Throw it and buy a new one!

Jerry, maybe by responding to yourself you can figure out the answer...

Chadalicioso

[wb8yjf]

Re: Chassis Problem

Omega tek boards don't use the capacitors on the chassis...one of the GREAT features of the board! Have you tried bench testing the table contactor with a 24 VAC xfmr? It is rare, but sometimes these things die (or at least try to). Have you tried that chassis with another board to confirm the original board is NOT the problem? Good luck! Jon [img]/content/btubb/images/%%GRAEMLIN_URL%%/usflag.jpg[/img]

[8270king]

Re: Chassis Problem

Found some time....as opposed to losing time [img]/content/btubb/images/%%GRAEMLIN_URL%%/laugh.gif[/img]

I cured the problem.

It was the #3 board spot in the mother board.

The end was broken and the #3 Omega Tek card was making contact in the wrong spots.

I put a wire tie around the black clip so the board cannot move.

Jerry