Fanuc APC 330: Fanuc 0i Error Code APC 330

Symptoms

n-axis origin not set. APC alarm APC 330 is displayed.

Possible Causes

Absolute pulse coder battery depleted
APC cable disconnected or damaged
APC module internal failure
Origin position not set after battery replacement

Troubleshooting Steps

Step 1: Check the APC battery voltage for the affected axis when alarm APC 330 appears
Battery voltage above 3.0V; if below, replace battery
Step 2: Inspect APC cable and connector at the servo motor
Cable intact, connector properly seated
Step 3: If battery was replaced, perform origin return procedure for the affected axis
Axis origin set successfully, alarm clears
Step 4: If alarm persists, the APC module or pulse coder may need replacement
Fault confirmed by FANUC servo system diagnosis

How to Reset

Replace the APC battery if low, perform origin return after battery replacement. For cable or module faults, inspect and replace as needed, then clear with RESET.

Common Replacement Parts

A02B-0309-C: APC battery unit (3.6V lithium) (Replace before battery fully discharges to prevent position loss)

Frequently Asked Questions

Q: What does Fanuc APC alarm 330 mean?
APC n-Axis Origin Not Set: n-axis origin not set.
Q: How do I fix APC alarms?
Check and replace the APC battery if low. After battery replacement, perform the origin return (dog-less or with dog) procedure. If the alarm persists, check the APC cable and connector.

Fanuc 0i Error Code APC 330