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Unread 06-24-2013, 11:57 PM   #1
Getting Wild
 
Join Date: May 2013
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Default Battery cable vs OBC

It appears that the neg battery cable passes through the OBC. If this is so what purpose does this serve. I plain on going to #2 cables, will they pass through the opening or is it ok to go around the side of the bulk head???
Thanks
AL
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Unread 06-25-2013, 12:03 AM   #2
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Default Re: Battery cable vs OBC

A cable needs to go through it. Leave the one in it alone. Then run another 2 guage on same connections but go around obc. Make sense?
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Unread 06-25-2013, 12:32 AM   #3
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Default Re: Battery cable vs OBC

Yes I understand what you are saying. Does the OBC use the cable to sense amps or does it have something to do with the charging system? Thanks for the tip.
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Unread 06-25-2013, 12:35 AM   #4
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Default Re: Battery cable vs OBC

Has to do with the charging system


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Unread 06-25-2013, 12:38 AM   #5
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Default Re: Battery cable vs OBC

What it senses is heresay. Some say it senses pack voltage, which is what I think and others say amperage and thus amount of discharge. Either way the method I described has worked for many.
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Unread 06-25-2013, 12:51 AM   #6
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Default Re: Battery cable vs OBC

From the ClubCar IQ Manual

OBC (On Board Computer) WIRES function explained:

Red(18-gauge) Main power supply for the onboard computer. The vehicle
batteries provide +48 volts to the onboard computer.
White (18-gauge)
The Tow/Run switch provides +48 volts to the OBC through the
white wire when the switch is in the RUN position. When the
Tow/Run switch is in the TOW position, the OBC locks out the
speed controller by not sending a +48 volt signal through the
light blue OBC wire.
Yellow (18-gauge)
Enables the OBC to power-up (brings the OBC out of sleep
mode) when the accelerator pedal is pressed. The MCOR limit
switch provides +48 volts to the OBC when the accelerator pedal
is pressed.
Brown/White (18-gauge) Controls the battery warning light by providing a ground to the
light through a transistor inside the OBC.
Light Blue (18-gauge) Solenoid lockout circuit the OBC provides a +48 volt signal to
the speed controller when the battery charger is disconnected.
Green/White (18-gauge) Reserved for future use. Wire serves no function at this time
Gray (18-gauge)
Provides a ground for the charger relay when the battery charger
is connected to the vehicle. Also enables the OBC to power-up
(brings the OBC out of sleep mode).
Black (10-gauge) to battery charger receptacle Battery charging current is controlled by the SCR (siliconcontrolled
rec Black (10-gauge) to B terminal of speed controller tifier) inside the onboard computer.
Black (6-gauge) through onboard computer Allows the hall-effect sensor inside the OBC to measure the
amount of current passing through this wire.
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Unread 06-25-2013, 07:32 AM   #7
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Default Re: Battery cable vs OBC

Really good info. Maybe it uses the reading to cycle the charger?
thanks all.
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Unread 06-25-2013, 08:08 AM   #8
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Default Re: Battery cable vs OBC

Quote:
Originally Posted by anix View Post
Really good info. Maybe it uses the reading to cycle the charger?
thanks all.
. . . the reading determines how much the OBC will allow the charger to replenish the pack . . .
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Unread 06-25-2013, 08:36 AM   #9
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Default Re: Battery cable vs OBC

So running a second cable in parallel with the one passing through the OBC shouldn't change what the OBC sences then right? As long as this little trick works I guess there is no sense in over analyzing it. But for future reference I would be curious as to just how it works. The OBC must create a current flow somehow so that it can calculate pac V?? Anyway thanks for the great info. It is great to learn something new everyday..now if I could only figure out how to remember it. When you get a few years on you watch out you may suffer a little CRS lol.
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Unread 06-25-2013, 08:45 AM   #10
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Default Re: Battery cable vs OBC

Running a second cable sure will screw up what the OBC is sensing for current! A Hall sensor senses the magnetic field generated by the current flow and thus senses current. It will only sense the current going through it not around it.
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