hmm...just a real quick question here folks, So im building an amp rack and i was just wondering, do splice the hot wire from the fan into the REM wire right on the amplifier? The fan doesnt need much voltage so i figure the REM will have enough, Then just splice into the ground on the amplifier also?
Thanks
Jason
Replies (8)
uochronos on 08/21/2004 00:27:52
i wuold not suggest the REM wire especialy if you have more then one amp... these wires dont carry alot of voltage and can be over worked and burn out in the HU if too much is pulled. i would suggest the power wire from teh batter splice into that and then use a switch to turn them on off.. or you can get a device for some reason i cant remember the simple name lol its been a long day but you hook a positive in a negitive in an a remote to it then positive and negitive out this way the remote just turns the fans on it does not power them
P0werLifter on 08/21/2004 00:37:17
Hmm alright thanks..,ill go find a switch somewhere then hide it somewhere lol...any other ideas ?
-Jason
swez on 08/21/2004 09:05:17
Other idea Chronos was mentioning is a relay circuit that is triggered by the REM to close a power circuit. This relay coil is connected to REM line. Then a power line from + BAT feeds the amp REM's and fans. This relay can handle 30A or 360 watts of power safely. The REM circuit on your HU can only handle ~250mV (1/4 volt) before the REM circuit is damaged.
Let me see if I can find some diagrams or readings on how to install a relay properly. Yep... right here:
http://www.bcae1.com/relays.htm
Swez
P0werLifter on 08/21/2004 13:26:45
Alright thanks ill go down and pick one up and wire it that way..thanks again
-Jason
P0werLifter on 08/21/2004 15:13:11
Ok i read the article but im still a lil confused about the relay. Ok so you have your relay, you wire a constant hot from the battery, your ground, your REM, then your other REM Leads from the relay to the amplifiers and also your hot to the fan from the same terminal on the relay as the REM Leads?....Also i am confused as it how this would turn on and off. Since there is allways a constant hot lead wired to the relay, wouldnt everything have power all the time? or does the REM from the HU come into play here with the ablility to turn it on and off?
It might sound like a stupid question but id rather know than keep experimenting with it lol
-Jason
swez on 08/21/2004 18:52:31
The REM voltage from the HU energizes the solinoid only when the HU is on. There is a 12 volt potential on the inbound line off the battery, but does not connect to the outbound side until the solinoid coil is energized. (a SPST switch with a magnetic coil)
The outbound power from the relay is same potential as battery and the relay can handle amp REM's and fans all at once. These relays can handle 30-40A of current, depending on the version you get.
Also, did you read the section on reverse EMF? A bleedoff resistor or diode attached to the coil will prevent reverse EMF so it does not harm your HU REM circuit. I highly recommend using one or the other.
The first time around, this topic confuses most folks. You are not alone.
Swez
P0werLifter on 08/22/2004 05:46:04
Alright thanks Swez...reassured my thoughts on the topic. Yah im going to use a diode ran in parralel to the relay to make sure there is no Reverse EMF...thanks again
Jason
swez on 08/22/2004 08:51:28
You bet there Jason!
Swez
Thanks
Jason
Replies (8)
uochronos on 08/21/2004 00:27:52
i wuold not suggest the REM wire especialy if you have more then one amp... these wires dont carry alot of voltage and can be over worked and burn out in the HU if too much is pulled. i would suggest the power wire from teh batter splice into that and then use a switch to turn them on off.. or you can get a device for some reason i cant remember the simple name lol its been a long day but you hook a positive in a negitive in an a remote to it then positive and negitive out this way the remote just turns the fans on it does not power them
P0werLifter on 08/21/2004 00:37:17
Hmm alright thanks..,ill go find a switch somewhere then hide it somewhere lol...any other ideas ?
-Jason
swez on 08/21/2004 09:05:17
Other idea Chronos was mentioning is a relay circuit that is triggered by the REM to close a power circuit. This relay coil is connected to REM line. Then a power line from + BAT feeds the amp REM's and fans. This relay can handle 30A or 360 watts of power safely. The REM circuit on your HU can only handle ~250mV (1/4 volt) before the REM circuit is damaged.
Let me see if I can find some diagrams or readings on how to install a relay properly. Yep... right here:
http://www.bcae1.com/relays.htm
Swez
P0werLifter on 08/21/2004 13:26:45
Alright thanks ill go down and pick one up and wire it that way..thanks again
-Jason
P0werLifter on 08/21/2004 15:13:11
Ok i read the article but im still a lil confused about the relay. Ok so you have your relay, you wire a constant hot from the battery, your ground, your REM, then your other REM Leads from the relay to the amplifiers and also your hot to the fan from the same terminal on the relay as the REM Leads?....Also i am confused as it how this would turn on and off. Since there is allways a constant hot lead wired to the relay, wouldnt everything have power all the time? or does the REM from the HU come into play here with the ablility to turn it on and off?
It might sound like a stupid question but id rather know than keep experimenting with it lol
-Jason
swez on 08/21/2004 18:52:31
The REM voltage from the HU energizes the solinoid only when the HU is on. There is a 12 volt potential on the inbound line off the battery, but does not connect to the outbound side until the solinoid coil is energized. (a SPST switch with a magnetic coil)
The outbound power from the relay is same potential as battery and the relay can handle amp REM's and fans all at once. These relays can handle 30-40A of current, depending on the version you get.
Also, did you read the section on reverse EMF? A bleedoff resistor or diode attached to the coil will prevent reverse EMF so it does not harm your HU REM circuit. I highly recommend using one or the other.
The first time around, this topic confuses most folks. You are not alone.
Swez
P0werLifter on 08/22/2004 05:46:04
Alright thanks Swez...reassured my thoughts on the topic. Yah im going to use a diode ran in parralel to the relay to make sure there is no Reverse EMF...thanks again
Jason
swez on 08/22/2004 08:51:28
You bet there Jason!
Swez
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