SRVO-251: DB relay abnormal
The dynamic-brake relay inside the servo amplifier - the relay that shorts the motor windings to brake the axis electrically when servos drop - tested abnormal.
What it means
The dynamic-brake relay inside the servo amplifier - the relay that shorts the motor windings to brake the axis electrically when servos drop - tested abnormal. No ladder: amplifier replacement.
Common causes
Ranked by what technicians most often find, most likely first.
- Failed DB relay in the servo amplifier.
How to fix it
- Replace the servo amplifier with the controller de-energized and locked out, then power-cycle to clear.
- Until it is replaced, treat the axis's stopping behavior as suspect. The dynamic brake is part of how the robot stops when power drops.