Page 1 of 2 12 LastLast
Results 1 to 10 of 11

Thread: Fuse question

  1. 03-16-2002, 12:53 PM #1
    mp3commander
    mp3commander is offline
    Newbie
    Join Date
    Jan 2002
    Location
    Venezuela
    Posts
    37
    Send a message via ICQ to mp3commander

    Fuse question

    I need help with myMPD-8071 power supply.
    I'm trying to test my power supply just connecting the outputs to the motherboard in the car, using an external fuse.

    With a 7A the fuse fail,
    then I used a 20A and works fine, but, when I turn it on again the 20A fuse fail.

    is this normal???
    What fuse can I use??
    what do you recommend me to do??

    Thank you for your help

    Mario.
    www.mp3commander.tk
    Reply With Quote Reply With Quote
  2. 03-16-2002, 09:25 PM #2
    magnetik
    magnetik is offline
    FLAC
    Join Date
    Apr 2001
    Location
    Here, There, Everywhere
    Posts
    1,436

    Re: Fuse question

    The 20A probably fails due to the computers startup current blowing the fuse...... just try the next levels up 25A,30A, etc, etc.... that should be fine. Any fuse is gonna blow anyway in the case of a short circuit......
    Project - GAME OVER :(
    Reply With Quote Reply With Quote
  3. 03-17-2002, 12:59 AM #3
    hornet
    hornet is offline
    Maximum Bitrate
    Join Date
    Jan 2001
    Location
    Adelaide, SA, Australia
    Posts
    456
    Send a message via ICQ to hornet
    Your computer is probably drawing more than 20A on start up. Extra power is used in the inital startup, to spin up the HDD etc, During normal operation though, the computer could be using as little at 4A or less.
    Just try a bigger fuse..if you keep blowing larger fuses, then there may be a problem somewhere.
    http://www.mp3vl.tk Plans and progress on my install - (Updated 28 June 02)
    Australian mp3car Portal
    mp3car related links Check them out / Add some
    mp3car FAQ - RTFF

    [########==]80% Assembling
    -=Current Progress: Working Sproggy supply, building box.=-
    Reply With Quote Reply With Quote
  4. 03-17-2002, 02:51 AM #4
    zootjeff
    zootjeff is offline
    FLAC
    Join Date
    Apr 2001
    Location
    Portland OR
    Posts
    1,242
    I'll bet something else is the problem. I have a 70 watt power supply with a 10 amp fuse and The inrush current never hurt me. If you are pulling more than 20 amps for any reason on a 70 watt power supply. You have a short.
    MPEGBOX - Plexiglass Computer
    www.mpegbox.com
    Reply With Quote Reply With Quote
  5. 03-17-2002, 02:17 PM #5
    mp3commander
    mp3commander is offline
    Newbie
    Join Date
    Jan 2002
    Location
    Venezuela
    Posts
    37
    Send a message via ICQ to mp3commander
    Now I use a 30A fuse and works fine.

    Thank you.
    www.mp3commander.tk
    Reply With Quote Reply With Quote
  6. 03-17-2002, 03:56 PM #6
    Aaron Cake
    Aaron Cake is offline
    Retired Admin Aaron Cake's Avatar
    Join Date
    Jan 2000
    Location
    London, Ontario, Canada
    Posts
    2,464
    Send a message via ICQ to Aaron Cake Send a message via Yahoo to Aaron Cake

    Talking

    Don't use a larger fuse...Use a 10A SLOW BLOW fuse. It will allow much more current to pass during initial startup, but still blow after exceding 10A for several seconds...Much safter than simply uprating things...
    Player: Pentium 166MMX, Amptron 598LMR MB w/onboard Sound, Video, LAN, 10.2 Gig Fujitsu Laptop HD, Arise 865 DC-DC Converter, Lexan Case, Custom Software w/Voice Interface, MS Access Based Playlists
    Car: 1986 Mazda RX-7 Turbo (highly modded), 1978 RX-7 Beater (Dead, parting out), 2001 Honda Insight
    "If one more body-kitted, cut-spring-lowered, farty-exhausted Civic revs on me at an intersection, I swear I'm going to get out of my car and cram their ridiculous double-decker aluminium wing firmly up their rump."
    Reply With Quote Reply With Quote
  7. 03-17-2002, 08:52 PM #7
    hornet
    hornet is offline
    Maximum Bitrate
    Join Date
    Jan 2001
    Location
    Adelaide, SA, Australia
    Posts
    456
    Send a message via ICQ to hornet
    Use a 10A SLOW BLOW
    I've never heard of a slow blow fuse.
    Well thats my daily learning now, I'm going back to sleep
    http://www.mp3vl.tk Plans and progress on my install - (Updated 28 June 02)
    Australian mp3car Portal
    mp3car related links Check them out / Add some
    mp3car FAQ - RTFF

    [########==]80% Assembling
    -=Current Progress: Working Sproggy supply, building box.=-
    Reply With Quote Reply With Quote
  8. 03-18-2002, 04:48 AM #8
    Holden__V8
    Holden__V8 is offline
    Variable Bitrate
    Join Date
    Jan 2002
    Location
    Melbourne Australia
    Posts
    254
    Send a message via ICQ to Holden__V8 Send a message via MSN to Holden__V8
    Hey do you reckon it should be ok if i just run my +12v power to my inverter straight off one of the connection's on my distrobution block for my amp's with a 20amp fuse.
    http://austmp3car.tk
    Reply With Quote Reply With Quote
  9. 03-18-2002, 09:33 AM #9
    Aaron Cake
    Aaron Cake is offline
    Retired Admin Aaron Cake's Avatar
    Join Date
    Jan 2000
    Location
    London, Ontario, Canada
    Posts
    2,464
    Send a message via ICQ to Aaron Cake Send a message via Yahoo to Aaron Cake
    Originally posted by hornet

    I've never heard of a slow blow fuse.
    Well thats my daily learning now, I'm going back to sleep
    Slow blow fuses are designed for large inductive loads like motors. They have a small thermal element inside the blows after reaching a certain temperature....If you look at a regular fuse, and then look at a slow blow, you will see the difference. If you still have fuses in your house (I do) you will probably find that you have a slow-blow on your furnace.
    Player: Pentium 166MMX, Amptron 598LMR MB w/onboard Sound, Video, LAN, 10.2 Gig Fujitsu Laptop HD, Arise 865 DC-DC Converter, Lexan Case, Custom Software w/Voice Interface, MS Access Based Playlists
    Car: 1986 Mazda RX-7 Turbo (highly modded), 1978 RX-7 Beater (Dead, parting out), 2001 Honda Insight
    "If one more body-kitted, cut-spring-lowered, farty-exhausted Civic revs on me at an intersection, I swear I'm going to get out of my car and cram their ridiculous double-decker aluminium wing firmly up their rump."
    Reply With Quote Reply With Quote
  10. 03-18-2002, 10:09 AM #10
    hornet
    hornet is offline
    Maximum Bitrate
    Join Date
    Jan 2001
    Location
    Adelaide, SA, Australia
    Posts
    456
    Send a message via ICQ to hornet
    Originally posted by Holden__V8
    Hey do you reckon it should be ok if i just run my +12v power to my inverter straight off one of the connection's on my distrobution block for my amp's with a 20amp fuse.
    I cant see a problem with that, although i would sugest using a relay, possibly wired up to your amps remote lead, so that your inverter isn't constantly on, like it would be wired stright to the dist. block
    http://www.mp3vl.tk Plans and progress on my install - (Updated 28 June 02)
    Australian mp3car Portal
    mp3car related links Check them out / Add some
    mp3car FAQ - RTFF

    [########==]80% Assembling
    -=Current Progress: Working Sproggy supply, building box.=-
    Reply With Quote Reply With Quote
Page 1 of 2 12 LastLast
« Previous Thread | Next Thread »

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Forum Rules