[PSUBS-MAILIST] Pre-Charge Resistor

[Alan James via Personal_Submersibles]

Thanks Steve,I didn't know there was such a calculator.The resistor Kelly supplied was  1K, the link I posted was misleading.I would need to contact Kelly to find out about the capacitors in my controller.I have seen figures elsewhere of anywhere up to 4 seconds delay.The 1k resistor will run my test battery (48V 40ahr) down in about 800 hrs. if I don't disconnect the battery or resistor; unless there is some electronics that I don't know about that monitors the state of charge of the capacitors & turns their power supply off & on.Cheers Alan


      From: Stephen Fordyce via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Saturday, April 9, 2016 10:50 AM
 Subject: Re: [PSUBS-MAILIST] Pre-Charge Resistor
   
Hi Alan,
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.Cheers,
SteveOn 9 Apr 2016 8:28 am, "Alan James via Personal_Submersibles" <personal_submersibles at psubs.org> wrote:

OK figured out what I am doing.For this experimental stage I will just have a circuit breaker on the battery + side of the main switch& pre-charge resistor. I will trip this breaker when finished to take current off the resistor.When operational on the sub I will have a relay to a solenoid switch.When the relay is turned on, the pre-charge resister will see current & charge the capacitorsbut there will be a timer circuit with a delay of 1 second before power goes to the solenoid switch.Cheers Alan

      From: Alan James via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Saturday, April 9, 2016 4:26 AM
 Subject: [PSUBS-MAILIST] Pre-Charge Resistor
  
 Does anyone have any experience with pre-charge resistors.I am wiring up my Kelly controller & they provide a pre-charge resistor similar to this one.http://www.electricmotorsport.com/wirewound-pre-charge-resistor-5w-10k-ohms.htmlThey are put across the terminals on a main power switch so that they charge up the banksof capacitors that motor controllers have. Without them there is a large inrush of current to the capacitors that can cause arcing to switches & damage to controller components.However if you wire it across the power switch there is always some current going to thecontroller. It probably only drives the ON LED on the motor controller, but I am not sureof this. I can have another switch or circuit breaker up stream of the main switch, but youwould have to turn them on in the right sequence. I have heard of circuits that have delays,so that when the power switch is turned on, power runs through the pre-charge resistor first.Are there marine switches with built in pre- charge circuits?Regards Alan






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