Power distribution in a hardwired drag system

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Power distribution in a hardwired drag system

Postby samiam » Thu May 24, 2018 2:33 pm

Our group has one of the 2910 drag systems and have repaired our track cables more than once. When the track cable gets run over, I have seen the timer turn off or the tree do weird things.

How is power feed through all the wiring?
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Re: Power distribution in a hardwired drag system

Postby raceamerica » Thu May 24, 2018 3:43 pm

110VAC or 220VAC is converted to approximately 15VDC inside the tree. The 15VDC is feed to the 2900 or 2910 timer through the 4-conductor interconnect cable. The 15VDC is also converted to lower DC voltages for the circuitry inside the tree. The 2910 converts the 15VDC to lower DC voltages for the circuity inside the timer. The 15VDC is then distributed through all track cables to the track sensors.

When the 15VDC is shorted to one of the sensor signals or even to ground, the voltage will be lower. Also, the farther away from the timer you get with longer downtrack cables, the lower the voltage. the amount of voltage loss in the cables depends on cable distance from the tree and number of sensors connected along the way.

If the 15VDC is shorted to one of the sensor connections in the track cables, bad things could happen to the sensor or the circuitry in the timer. Once again, the farther away from the wire short the sensor or timer is, the better chance no permanent damage will occur.

Same power distribution occurs in the 2700 wireless system, just fewer cables and only 60FT and start sensors connect to the 15VDC.
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Re: Power distribution in a hardwired drag system

Postby samiam » Thu May 24, 2018 3:47 pm

Ah, now it makes sense what we have been seeing.

Time to go repair some cables ... or replace the ones with too many bandaids.
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Re: Power distribution in a hardwired drag system

Postby samiam » Wed Aug 08, 2018 8:30 am

Can I get the pinouts for the power into the timer and power out of the timer to the track cables? The LEDs on the timer do not light up and I checked the fuse on the timer.
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Re: Power distribution in a hardwired drag system

Postby raceamerica » Wed Aug 08, 2018 6:29 pm

Power from the tree to the 2900/2910 timer connect through the 4-conductor round connector of the tree-to-timer cable. Pin 1 is POWER and pin 4 is GROUND at the tree connector and the end of the cable when connected to the tree. Should be approximately 15vdc between these pins. Power from the timer to the track sensors is provided through the fuse to the 16-conductor connector on the timer. Pin 1 is POWER and pin 16 is GROUND. Should be approximately 14.3vdc between these pins.

The LEDs will illuminate if there is power in the timer and the MCU is functioning. Hope this helps.
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