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Steve Hills
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494 Posts
Hi all,
thanks for your comments and the opportunity to reply to questions.

Thanks Graham for the initial posting and your remarks. I have heard that you're one of the clever guys out there, so it means a great deal to me to have your approval.


Chris answered perfectly the problem of fuses trying to protect output devices such as transistors or Mosfets.
He is quite correct that the fuse is more to halt additional damage than to prevent it in the first place.
My income is generated from the repair if music related electronics goods where the output stages are blown, and the fuses then blow to prevent fires etc.

Since the PWM controller is designed to work with both 1/24th and 1/32nd scale racing, one value of fuse cannot fit all the variations in power draw needs.
The 1/24th guys usually have 'power relays' connected as close to the plug terminals as possible to reduce the fractions or a volt lost along the wiring, so I decided that since a fuse looses the same, it would be best to leave the over-current issue to be dealt with in the club track wiring as RichD suggests, and not within the controller. That way the club PSU is protected with a specific fuse for its own ratings, and the controllers are free from that impossible task.
What I have done in the design is to make replacement of the output devices an easy job in case there is a damaging over-current or wrong connection situation.

I hope that covers the question, but please feel free to quiz more.

regards to all,
Steve Hills.
 

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Steve Hills
Joined
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494 Posts
QUOTE (GRAH1 @ 21 Jul 2007, 01:09) <{POST_SNAPBACK}>Thanks for the reply steve ,I gave the controller a good test tonight and Im pleased to say it performed very well especialy when used with a car which was quite difficult to drive .The use of the power reduction control and the acceleration tamed the difficult car enabling the available power to be used to maximum effect .Hopefully I can give it a further test at pendle on tues day before I return to Crete .

Hi Graham,
I forgot to mention that the RELEASE function is not just a pure timer, but works in conjunction with the motor speed.
It is a timer coupled in with the motor speed feedback so that if you are going too fast for the brakes to release at the setting you've chosen, they stay on till you've slowed down to the correct speed.
The function explanation that I send out with these controllers may need a little revision to make that easier to understand.

Have a great time in Crete.


regards,
Steve
 
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