โJan-04-2014 08:17 AM
โJan-05-2014 12:00 PM
camperpaul wrote:Mike Stanbro wrote:
-- snip -- it is not unreasonable to install a 30 amp fuse for the jack motor. But, as I have been somewhat preaching, a Type 1 circuit breaker is a much better protection choice as it is possible to exceed 30 amps when the jack hits the top or bottom end and stalls.
An even better choice is limit switches at both ends of the jacks travel.
Instead of the motor stalling and blowing a fuse or tripping a breaker, the limit switches just turn off power to the motor.
Anything else is SHODDY ENGINEERING.
โJan-05-2014 09:02 AM
Mike Stanbro wrote:
-- snip -- it is not unreasonable to install a 30 amp fuse for the jack motor. But, as I have been somewhat preaching, a Type 1 circuit breaker is a much better protection choice as it is possible to exceed 30 amps when the jack hits the top or bottom end and stalls.
โJan-05-2014 08:34 AM
pianotuna wrote:
Hi Mike,
Your example applies to alternating current motors. My understanding is that DC motors do not behave in the same manner.
โJan-04-2014 08:26 PM
pianotuna wrote:
Hi Mike,
Your example applies to alternating current motors. My understanding is that DC motors do not behave in the same manner.
โJan-04-2014 06:14 PM
โJan-04-2014 06:07 PM
โJan-04-2014 05:17 PM
skipro3 wrote:
I've measured current draw on my 2012 Lance 855S jacks. All 4 running the camper up will draw 32 amps at the battery. I checked each jack and the highest current draw was 8 amps. I replaced my fuses with 10 amp fuses. I want to KNOW when the current demand increases so I can fix why.
If you are blowing a 30 amp fuse on a single jack, you got a BIG problem. I can guarantee that the wires at my jack are NOT rated for 30 amps. (with the length of wire, 30amps should be a 10 gauge wire at 12vdc) You were lucky the fuse went and not the wiring burn up.
skipro3 wrote:
Think about it; if these jacks are fused at 30 amps each, multiply that by 4 and you would potentially draw 120 amps just to run the jacks before a fuse would blow. WOW!!
Old-Biscuit wrote:
Mark the jacks 1" from hitting full travel/upper & lower limits. Stop jacks when 1" mark reached and then you won't be blowing fuses/cbs from overload.
โJan-04-2014 02:49 PM
โJan-04-2014 12:59 PM
โJan-04-2014 12:13 PM
โJan-04-2014 09:22 AM
โJan-04-2014 08:27 AM
Mike Stanbro wrote:
Here are URLs to 5A and 30A blade-style breakers at the NAPA website if you are interested:
http://www.napaonline.com/Catalog/CatalogItemDetail.aspx/Circuit-Breaker-5-Amp-Blade/_/R-BK_7823010_...
http://www.napaonline.com/Catalog/CatalogItemDetail.aspx/Circuit-Breaker-30-Amp-Blade/_/R-BK_7823124...