Hi everyone, today I’m going to run through a few of the possible setups for Skookum Robotics’ SK PB-1 Power Bus.
The Power Bus can be used in a number of configurations, and today I’m going to walk through the most commonly used ones.
The Power Bus is designed to allow you to power your high voltage servos directly from an 8.4V 2S LiPo battery.
You can also run a mix of high and low voltage servos, using the same 2S LiPo battery and a BEC
Right out of the package, you’ll notice that there’s no battery connector attached to the Power Bus -
you need to solder a battery connector that fits the power source you’re using for your heli to the 18 gauge silicon wire.
I’m going to start by showing you how the Power Bus is connected to the SK 720 when using a satellite or SBUS receiver.
The four included jumper cables are connected to the BUS A, B, C, and D ports on the back of the Power BUS.
BUS A is connected vertically into the Tail port.
Bus B is connected horizontally across the top pins for SW L, R and C,
with the negative wire connected to SW L, the positive wire to SW-R and the Signal wire to SW-C.
BUS C is also connected to the SK 720 horizontally, into the IO-B, IO-A and SWA ports.
Like BUS B, it’s connected on the top row of pins with the negative wire on the left and the signal wire on the right.
BUS D is connected vertically to IO D, with the IO C port left open for an RPM sensor.
For a setup using all high voltage servos, connect the servos to the same ports as you would on the SK 720 –
the port names are identical, though the order on the servo bus is slightly different.
You’ll notice that there’s two tail ports on the Power Bus.
For this high voltage setup, connect the tail to the port beside PWR-HV.
Your ESC or throttle servo is connected on the upper rail of the Power Bus.
In order to deliver the 8.4 volts to that servo, bridge middle pins of the HV and LV ports with the included jumper plug,
then connect the ESC or throttle servo.
Now I’m going to show a combination of high and low voltage servos, running off the same 2S 8.4 volt battery.
Using high voltage swash servos, they’re connected in the same place as we did in the last setup.
Now, assuming we’re using a lower voltage tail servo, we’ll connect it to the top half of the power bus.
The lower voltage is delivered to top half of the bus via a BEC –
plug the input into the PWR-HV port, and the output into the PWR-LV port.
The throttle is connected to IO AT as usual, and the Tail servo into the low voltage tail port.
If you’re running entirely low voltage servos, connect the power bus directly to your 5 volt battery and
connect your servos the same way as you would if you were running all high voltage servos.
When it comes to connecting your SBUS or satellite receivers,
there’s no difference in the connection whether you’re using the power bus or not,
they both are connected in the SAT RX port on the side of the SK 720,
using an SBUS adapter when necessary.
Traditional Receivers are connected directly to the SK 720 as well.
However, the receiver connections use the ports normally connected to BUS C and D,
so you won’t be able to use the auxiliary ports on the Power BUS.
For instructions on how to connect a traditional receiver to the SK 720, watch our traditional receiver video.
Finally, I’ll show you how to use the soft-switch power bus.
Removing the jumper plug from the red and yellow wires sends power to the power bus.
This function is useful if you’d like to power up your servos and SK 720 from outside the canopy.
If you have any questions regarding the power bus, the SK 720 or any of the Skookum Robotics products,
send us an email at firstname.lastname@example.org, or check the wiki at skookumrobotics.com/wiki.
Thanks for watching.