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Wiring up my BIG PUMP compressor
Moderators: toaddog, TWISTY, V8Patrol, Moderators
Wiring up my BIG PUMP compressor
i have just taken delivery of my new BIG PUMP PX07 compressor from pro bag. and i have to say ITS HUGE.
the only concern and question i have is this.
it states in the wiring setup to run 15mm cable through a 100A fuse. the compressor draws at max approx 60A on startup. is that size cable overkill? (compressor will be behind seats of a GU cab chassis, distance approx 2m max)
where abouts would i have the switch to turn it on and off?
the scary thing is though, the compressor has a + and - lead out of it, now they are only approx 5mm in diameter. the instructions say to connect the 15mm cable direct to the 5mm. is that right???
thanks
PAUL
p.s thought it would be better here than auto elec. more opinions
the only concern and question i have is this.
it states in the wiring setup to run 15mm cable through a 100A fuse. the compressor draws at max approx 60A on startup. is that size cable overkill? (compressor will be behind seats of a GU cab chassis, distance approx 2m max)
where abouts would i have the switch to turn it on and off?
the scary thing is though, the compressor has a + and - lead out of it, now they are only approx 5mm in diameter. the instructions say to connect the 15mm cable direct to the 5mm. is that right???
thanks
PAUL
p.s thought it would be better here than auto elec. more opinions
Last edited by vanbox on Thu May 10, 2007 5:40 pm, edited 1 time in total.
I have this compressor that I bought off Hobzee (his Ebay store) its 3/4hp and 3cfm isn't it?????
cant be right on the 15mm cable, as you say the pump fly leads are only 5mm. That said cable size will depend on voltage drop (linked to length of cable!)
After 9months I still have this compressor in a plastic toolbox with twin 6mm cables approx 1.4m long, i then alligator clip to the battery put compressor in front of truck and run a 10mm blue nylon airline to all 4 tyres. Its still quick in this guise but i will fit up in the engine bay with air tank alongside the chassis soon.
I used a resettable circuit breaker (40amp i think) as the compressor pulls 30-35amp on startup.......looks like they have changed their specs tho, i will check mine tonight.
cant be right on the 15mm cable, as you say the pump fly leads are only 5mm. That said cable size will depend on voltage drop (linked to length of cable!)
After 9months I still have this compressor in a plastic toolbox with twin 6mm cables approx 1.4m long, i then alligator clip to the battery put compressor in front of truck and run a 10mm blue nylon airline to all 4 tyres. Its still quick in this guise but i will fit up in the engine bay with air tank alongside the chassis soon.
I used a resettable circuit breaker (40amp i think) as the compressor pulls 30-35amp on startup.......looks like they have changed their specs tho, i will check mine tonight.
Check this link
http://www.users.bigpond.net.au/rta8925 ... essors.htm
thats the spec for your compressor! May be worth a phone call to Pro-bag to confirm! (and reprot here )
http://www.users.bigpond.net.au/rta8925 ... essors.htm
thats the spec for your compressor! May be worth a phone call to Pro-bag to confirm! (and reprot here )
gtir300 that would be good thanks.looks like they have changed their specs tho, i will check mine tonight.
how much was the circuit breaker? might be a better option then fuses = $$$$ can u get 12v ones? from supercheap or something else?
a call to probag will be the safest option though. so will prob do it tomorrow without some more opinions from here.
are u using a relay? (30A) or a heavy duty solenoid like the diagram shows?
ill ring probag to confirm, but everyone so far seems to think the requirements are overkill. ESPECIALLY because the fly wires from the comp are tiny (5mm).
where abouts in that wiring diagram would the on/off switch be? in the power supply TO the pressure switch?
ill ring probag to confirm, but everyone so far seems to think the requirements are overkill. ESPECIALLY because the fly wires from the comp are tiny (5mm).
where abouts in that wiring diagram would the on/off switch be? in the power supply TO the pressure switch?
it probably means 15mm squared, as in the cross sectional area of the cable.vanbox wrote:good thought, but i imagine it would need to be more than 15Amp. however 15mm cable should be good for several hundred ampsmaybe 15 amp cable not 15mm ??
that would make the cable with a copper diameter of 4.4mm, overall diameter(including shielding) about 7mm
thats the most logical explanation so far. thats the approx size of the wires from the compressor.it probably means 15mm squared, as in the cross sectional area of the cable.
that would make the cable with a copper diameter of 4.4mm, overall diameter(including shielding) about 7mm
that sort of gauge wire wont be able to carry 100A would it? cause thats the fuse they recommend. ill get a circuit breaker though.
100amp fuse doesnt mean the compressor will draw 100amp continuous.vanbox wrote:thats the most logical explanation so far. thats the approx size of the wires from the compressor.it probably means 15mm squared, as in the cross sectional area of the cable.
that would make the cable with a copper diameter of 4.4mm, overall diameter(including shielding) about 7mm
that sort of gauge wire wont be able to carry 100A would it? cause thats the fuse they recommend. ill get a circuit breaker though.
It only draws an 80amp kick at the start, and then settles to probably about 30amps running.
Thus, the cable doesnt need to be rated to 80amps at all, rather, a 40/50amp cable would be enough.
A 2 amp cable can carry 80amps, just not for very long.
alright sounding good now.
would i still use a 100A circuit breaker like they recommend? and if possible ill try and get some 80A wire to cover the initial "kick" of 60A.
what size relay should i use? they list a solenoid but now i know it doesnt need to be that heavy. do they make relays of 80A or so?
my question about the fuse and wire is that if the fuse is rated higher then the cable, wont it melt before the fuse goes?
would i still use a 100A circuit breaker like they recommend? and if possible ill try and get some 80A wire to cover the initial "kick" of 60A.
what size relay should i use? they list a solenoid but now i know it doesnt need to be that heavy. do they make relays of 80A or so?
my question about the fuse and wire is that if the fuse is rated higher then the cable, wont it melt before the fuse goes?
i have just fitted a big red compressor in the stoage system of my patrol SWB and between the pump and the air tank i would recommend using braided line or stainless line as i keep melting the standard air line most shops will say to use. Mkae sure the compressor gets a good air flow as these type of pumps get hot quickly.
well your fuse is designed to protect the cable and car from fire.vanbox wrote:alright sounding good now.
would i still use a 100A circuit breaker like they recommend? and if possible ill try and get some 80A wire to cover the initial "kick" of 60A.
what size relay should i use? they list a solenoid but now i know it doesnt need to be that heavy. do they make relays of 80A or so?
my question about the fuse and wire is that if the fuse is rated higher then the cable, wont it melt before the fuse goes?
so if your going to use a 100amp fuse, you really should have 100 amp cable.
The alternative is, if you have 40amp cable, run a 40amp slow blow fuse. This will allow the pump to pull brief surges of much higher amperage, but will still protect your cable (and car) from fire.
Dont know if they make a "slow blow circuit breaker".
That said, i know in House applications, they use cable much the same for the mains supply to the house, which is rated at upwards of 80amps, so i think 15mm^2 cable is probably rated as high as 80 amps if not 100amps anyway.
http://www.energy-solutions.co.uk/cable_conductor.html
This table indicates youd need 50mm^2 cable to carry 105amps at 60degrees C. now 50mm^2 cable is a diametre of 8mm (conductor) so probably about 12mm with shielding.
This table indicates youd need 50mm^2 cable to carry 105amps at 60degrees C. now 50mm^2 cable is a diametre of 8mm (conductor) so probably about 12mm with shielding.
if it was me, i would be using bigger cable since your running it into the vehicle and quite far (if its going behind the rear seats, id suggest it would be closer to 3metres or more).
Id grab some 50mm^2 cable, you might aswell do it right the first time.
even if it is overkill, you can then comfortably plug in other accessories back there, like fridge or lights etc.
http://www.powerstream.com/Wire_Size.htm
this site suggests youd need something witha diametre of 7.4mm 1guage, or 43mm^2.
Id grab some 50mm^2 cable, you might aswell do it right the first time.
even if it is overkill, you can then comfortably plug in other accessories back there, like fridge or lights etc.
http://www.powerstream.com/Wire_Size.htm
this site suggests youd need something witha diametre of 7.4mm 1guage, or 43mm^2.
dont even think about using 50mm2 for an air compressor, some winches don't even need 50mm2.
just use some 6mm2, 60A is maximum draw for the motor under locked rotor about 1/2 second if that, the running current would be no more than 75% of that. by all means use a large circuit breaker or fuse. with auto wiring the cb/fuse is only going to protect the cables from a short circuit not from overload. if your compressor is not going to be mounted in the engine bay then start thinking about bigger cable purely for voltage drop.
just use some 6mm2, 60A is maximum draw for the motor under locked rotor about 1/2 second if that, the running current would be no more than 75% of that. by all means use a large circuit breaker or fuse. with auto wiring the cb/fuse is only going to protect the cables from a short circuit not from overload. if your compressor is not going to be mounted in the engine bay then start thinking about bigger cable purely for voltage drop.
swb safari
thanks for all the info guys. bought some gear today.
went with 4G wire rated to 120A to cover the 2m from engine bay to cab (i have a ute) so wont drop much voltage.
got me a 100A circuit breaker in place of a fuse (fuse and holder was same price) and a 200A dual battery solenoid to kick it into life.
havent wired it all up yet, just mounted the compressor today. waiting on all the air fittings to complete it.
thanks again for all your help.
PAUL
went with 4G wire rated to 120A to cover the 2m from engine bay to cab (i have a ute) so wont drop much voltage.
got me a 100A circuit breaker in place of a fuse (fuse and holder was same price) and a 200A dual battery solenoid to kick it into life.
havent wired it all up yet, just mounted the compressor today. waiting on all the air fittings to complete it.
thanks again for all your help.
PAUL
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paul if you could mate keep this thred updated as i too have the same pump and am really keen to see other set ups...... more pics the better
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Jimmy James Beam the III from babinda and mt isa and other places u don't wanna know about :armsup:
www.blackriver4wd.com
Jimmy James Beam the III from babinda and mt isa and other places u don't wanna know about :armsup:
www.blackriver4wd.com
yeh no probs. when its all finished ill have diagrams and pics for everyone. its costing me a bit just to wire it up, but im sure it will be worth it. got a BIG handful of air fittings on order and should be able to plumb it all next week sometime. cant wait!
PAUL
oh, does anyone know what the recommended air pressure to operate ARB lockers is? is there a safe range?
PAUL
oh, does anyone know what the recommended air pressure to operate ARB lockers is? is there a safe range?
85psi from what ive read on these forums.vanbox wrote:yeh no probs. when its all finished ill have diagrams and pics for everyone. its costing me a bit just to wire it up, but im sure it will be worth it. got a BIG handful of air fittings on order and should be able to plumb it all next week sometime. cant wait!
PAUL
oh, does anyone know what the recommended air pressure to operate ARB lockers is? is there a safe range?
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