First, apologies - I know there were some old threads on this subject but I can't find them anymore...
I have a Torq Cut 22/DX32 VMC. Every few months, the thyristor (Grayhill 70M-OAC5A) which controls the "out" direction of the tool changer fails on the LC-TLAUF board. I've now replaced it three times in two years. Any ideas about the root cause of this problem so I can eliminate it?
TIA,
Mark
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10-27-2020, 01:45 AM #1
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Torq Cut Tool Changer Thyristor Failing
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10-27-2020, 04:39 AM #2
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Re: Torq Cut Tool Changer Thyristor Failing
...possible failing Solenoid Coil drawing to much current (amperage) for the relay to handle. Looks like that 70M-OAC5A Relay is rated 3 amp
https://www.digikey.com/en/products/...M-OAC5A/180934
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10-27-2020, 07:05 AM #3
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Re: Torq Cut Tool Changer Thyristor Failing
You should definitely check the coil and compare its DC resistance with a known good one. Also check if the "IN" relay gets hotter than the "OUT" relay during operation.
Another possible reason is an intermittent short in the wiring.
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