FANUC Alarm SRVO-063 — SERVO RCAL alarm
Manufacturer wording — SERVO RCAL alarm(Group:%d Axis:%d)
The manual prints placeholders; your controller fills them in with the real group, axis or number.
FANUC SRVO-063 (“SERVO RCAL alarm”): The built-in rotation counter on the pulse coder is abnormal. First check: 1. Eliminate the cause of the alarm. Likely part: Pulsecoder (Pulsecoder (motor encoder)).
Updated 2026-09-17 · LogrobotLM reference
Description
The built-in rotation counter on the pulse coder is abnormal.
Remedy
1. Eliminate the cause of the alarm. Set the system variable $MCR.$SPC_RESET to TRUE, and turn the power off and then on again. Master the robot. 2. Replace the pulse coder. Master the robot. NOTE: The RCAL alarm might be displayed when any of the SERVO-068 DTERR, SERVO-069 CRCERR, or SERVO-070 STBERR alarms is raised. In this case, however, this alarm can be safely ignored.
Part to check / replace
FANUC SRVO-063 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 →