<p dir="ltr">Hi Alan,<br>
Just putting it out there, it could actually take a while to charge a large capacitor bank through a 10k resistor - not sure if you've checked this but there are calculators on the web for that.</p>
<p dir="ltr">Cheers,<br>
Steve</p>
<div class="gmail_quote">On 9 Apr 2016 8:28 am, "Alan James via Personal_Submersibles" <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div style="color:#000;background-color:#fff;font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:16px"><div><span></span></div><div dir="ltr">OK figured out what I am doing.</div><div dir="ltr">For this experimental stage I will just have a circuit breaker on the battery + side of the main switch</div><div dir="ltr">& pre-charge resistor. I will trip this breaker when finished to take current off the resistor.</div><div dir="ltr">When operational on the sub I will have a relay to a solenoid switch.</div><div dir="ltr">When the relay is turned on, the pre-charge resister will see current & charge the capacitors</div><div dir="ltr">but there will be a timer circuit with a delay of 1 second before power goes to the solenoid switch.</div><div dir="ltr">Cheers Alan<br><br></div><div style="display:block"> <div style="font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:16px"> <div style="font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:16px"> <div dir="ltr"> <font face="Arial" size="2"> <hr size="1"> <b><span style="font-weight:bold">From:</span></b> Alan James via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br> <b><span style="font-weight:bold">To:</span></b> Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>> <br> <b><span style="font-weight:bold">Sent:</span></b> Saturday, April 9, 2016 4:26 AM<br> <b><span style="font-weight:bold">Subject:</span></b> [PSUBS-MAILIST] Pre-Charge Resistor<br> </font> </div> <div><br><div><div><div style="color:rgb(0,0,0);font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:16px;background-color:rgb(255,255,255)"><div> Does anyone have any experience with pre-charge resistors.</div><div>I am wiring up my Kelly controller & they provide a pre-charge resistor similar to this one.</div><div dir="ltr"><a href="http://www.electricmotorsport.com/wirewound-pre-charge-resistor-5w-10k-ohms.html" rel="nofollow" target="_blank">http://www.electricmotorsport.com/wirewound-pre-charge-resistor-5w-10k-ohms.html</a></div><div>They are put across the terminals on a main power switch so that they charge up the banks</div><div dir="ltr">of capacitors that motor controllers have. Without them there is a large inrush of current to </div><div dir="ltr">the capacitors that can cause arcing to switches & damage to controller components.</div><div dir="ltr">However if you wire it across the power switch there is always some current going to the</div><div dir="ltr">controller. It probably only drives the ON LED on the motor controller, but I am not sure</div><div dir="ltr">of this. I can have another switch or circuit breaker up stream of the main switch, but you</div><div dir="ltr">would have to turn them on in the right sequence. I have heard of circuits that have delays,</div><div dir="ltr">so that when the power switch is turned on, power runs through the pre-charge resistor first.</div><div dir="ltr">Are there marine switches with built in pre- charge circuits?</div><div dir="ltr">Regards Alan<br></div><div><br></div><div dir="ltr"><br></div><div><br></div><div><br></div><div><br></div></div></div></div><br>_______________________________________________<br>Personal_Submersibles mailing list<br><a href="mailto:Personal_Submersibles@psubs.org" target="_blank">Personal_Submersibles@psubs.org</a><br><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br><br><br></div> </div> </div> </div></div></div><br>_______________________________________________<br>
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