Power Distribution Hub Troubleshooting
The most common Power Distribution Hub troubleshooting issues are listed below. After reading through, if you still have questions or need additional help, reach out to us at: [email protected]
Is your Status LED light showing a new color or sequence? Check the Status LED Pattern page!
Smart Tug - tugging on a wire to test the connection with a reasonable amount of force.
Possible Solution
No Voltage / Device Does not Turn On
  • Perform a smart tug to check that the battery wires have a good connection to the input terminals
  • Check your battery voltage on the PDH's display, then check the voltage through the REV Hardware Client. If the readings are inconsistent or missing, check your robot's battery wiring.
  • If only being powered via USB there will not be any input voltage.
Channel LED Keeps Flashing
  • Make sure that the circuit breaker is properly inserted and snug in the holder
  • If the problem persists you may have a fault on the load causing the breaker to trip. Make sure there are no problems with your connected devices.
CAN Warning / CAN Bus Off
  • You will have a CAN warning when the device connected to the REV Hardware Client can not see any other devices on the network. If the CAN Bus loses connection briefly you will also see a CAN warning sticky fault.
  • Hardware Fault: CAN Bus off means that CAN network is not working on the device.
Hardware Fault
The hardware fault is generally an internal electrical fault. This could also trigger a sticky fault if a large amount of electrical noise caused a brief communication breakdown internally. This will not affect the function of the device but there could be a small amount of data lost during the interruption.
Device has Reset
The Reset Fault will be triggered when the Power Distribution Hub has lost power.
This will happen each time the robot is turned on and off. It is possible that this could happen when the robot has a bad connection to the battery or the robot experiences a severe brownout.
When are Sticky Faults Cleared?
Sticky faults are cleared when the mode button on the Power Distribution Hub is pressed or can be cleared using the REV Hardware Client. It is also possible to clear sticky faults using WPILib.

See Firmware Change Log

Version 21.1.7

  • Persists sticky faults across power cycles
  • Allows sticky faults to be cleared by holding down the device's button
  • Updates LED patterns
  • Turns off the switchable channel LED when the switchable channel is turned off
  • Reports to the REV Hardware Client whether a roboRIO is connected via the CAN network

3D Printed Breaker Extractor

The 3D printed Breaker Extractor makes freeing REV ATO Auto-resetting Breakers from the Power Distribution Hub easy!
First, grasp the T-handle of the extractor and slide the square frame around the breaker you would like to remove from the Power Distribution Hub.
Then, position the bottom edge of the breaker extractor under the bottom edge of the breaker. While maintaining that position, and contact with the plastic bottom of the breaker, gently rock the extractor handle side to side while pulling upwards.
Continue that motion until breaker is free.
Last modified 16d ago