SRVO-018: Brake abnormal
The brake circuit on the 6-axis amplifier drew more current than spec.
What it means
The brake circuit on the 6-axis amplifier drew more current than spec. Reported against the amplifier rather than the true axis - it always posts on axes 1-2 (or 1-2-3) of whichever amplifier saw the overcurrent, so don't assume the named axis is the guilty one.
Common causes
Ranked by what technicians most often find, most likely first.
- Short in the robot connection cable's brake lines (the manual's prime suspect).
- Shorted brake coil in a motor.
- Amplifier brake-circuit fault.
How to fix it
- This is an electrical fault in the brake circuit, not a reset-and-retry alarm, and it carries a real hazard: a brake that never releases or never holds can let a gravity-loaded axis drop. Keep personnel clear of and out from under the arm until the brake system is verified, and support gravity axes mechanically before any service. Diagnosis (checking the brake wiring for a short across all axes on that amplifier, not just the one named, then the motor brake coil and amplifier) is qualified-technician work per the controller maintenance manual with power locked out. If your site does not have qualified personnel for this, it is an OEM service call.
Quick facts
- Category
- Servo
- Affected series
- R-30iB; R-30iB Mate; R-30iB Plus; R-30iB Mate Plus
- Alarm family
- SRVO