[PSUBS-MAILIST] Pre-Charge Resistor

Stephen Fordyce via Personal_Submersibles personal_submersibles at psubs.org
Fri Apr 8 18:50:53 EDT 2016


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,
Steve
On 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 capacitors
> but 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.html
> They are put across the terminals on a main power switch so that they
> charge up the banks
> of 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 the
> controller. It probably only drives the ON LED on the motor controller,
> but I am not sure
> of this. I can have another switch or circuit breaker up stream of
> the main switch, but you
> would 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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