Rockwell Automation AK DBU - Dynamic Braking Unit 600/690 VAC - Manual (Page 25)

Start Up / Troubleshooting 2-3
The red DC Power ON LED is visible through the front panel and will
illuminate when power is applied to the drive and the DC bus voltage has
exceeded 50V.
Figure 2.1 DC Power on and Brake on Indicating LEDs
DC Power ON LED
!
ATTENTION: The LEDs on the DBU are only operational when the
unit is energized. Servicing energized equipment can be hazardous.
Severe injury or death can result from electrical shock, burn, or
unintended actuation of the controlled equipment. Follow Safety related
practices of NFPA 70E, ELECTRICAL SAFETY FOR EMPLOYEE
WORKPLACES. DO NOT work alone on energized equipment!
Brake On DC Power On