FANUC Alarm SRVO-065 — WARN BLAL alarm
Warning- Hardware
- backup batteries
- Controllers
- R-J3iB / R-30iA / R-30iB
- FANUC class
- WARN
- Hardware family
- FANUC Pulsecoder, backup battery and position loss alarms
Manufacturer wording — WARN BLAL alarm(Group:%d Axis:%d)
The manual prints placeholders; your controller fills them in with the real group, axis or number.
FANUC SRVO-065 (“WARN BLAL alarm”): The battery voltage for the pulse coder has dropped below the allowable minimum. First check: Replace the battery. Likely part: Backup battery (Backup battery).
Updated 2026-10-22 · LogrobotLM reference
Description
The battery voltage for the pulse coder has dropped below the allowable minimum.
Remedy
Replace the battery. When this alarm is issued, immediately replace the battery while the system power is turned on. If the BZAL alarm is issued because the battery is not replaced in time, positional data will be lost, thus making it necessary to master the robot.
Field diagnosis
The Pulsecoder backup battery voltage has dropped below the minimum: the position is still there, but not for long.
What to check
- Replace the batteries immediately, with the cabinet powered ON so as not to lose the position.
- Waiting means tipping into BZAL and having to redo the mastering.
- Note: The only battery alarm that still leaves a chance: deal with it the same day.
Part to check / replace
FANUC SRVO-065 points to the hardware below — start here before ordering.
Tap a part for every code that points to it — and verify the exact variant for your controller before ordering.
Related codes
Same hardware involved
Indicative field information — the robot manufacturer's manual and safety procedures always prevail. Never bypass a safety device; apply lockout/tagout (LOTO) before any physical intervention. How this reference is built →