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| Don't Forget to Change Your Backup Batteries ! |
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| awemawson:
I've heard of Contraves but never seen one, but I seem to remember that they have a reputation for being expensive to repair - but that's only hearsay. |
| nrml:
Google calendar is a godsend for these things along with birthdays and wedding anniversaries :palm:. You get emails and text messages to remind you as close to the event as you choose to set it. |
| AdeV:
--- Quote from: awemawson on July 14, 2020, 11:57:07 AM ---...I seem to remember that they have a reputation for being expensive to repair - but that's only hearsay. --- End quote --- Sounds about right.... I have a spare motor (picked up for relatively cheap on fleaBay), but no spare controller... Maybe I should rig the spare up on the bench & start experimenting with mosfets! :lol: :zap: :zap: :zap: |
| awemawson:
IIRC the Mentor is basically a massive H bridge driven by some cunning microprocessor trickery. The field winding is excited separately by another unit. |
| AdeV:
--- Quote from: awemawson on July 14, 2020, 03:18:43 PM ---IIRC the Mentor is basically a massive H bridge driven by some cunning microprocessor trickery. The field winding is excited separately by another unit. --- End quote --- I think that's basically true of the Contraves as well. It uses thyristors (must google them again, but IIRC they're like old-school high power mosfets) to provide the drive. I'm fairly sure it's the field exciter circuit that's let the smoke out this time. |
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