If SRVO-070 (BZAL Alarm) appears, try these immediate actions:
These steps can quickly restore operation if the issue is related to position data loss.
FANUC Alarm SRVO-070 (BZAL Alarm) indicates that the robot has lost its absolute position data.
This usually happens when:
As a result, the robot requires re-mastering before it can safely operate again.
SRVO-070 means the controller no longer knows the exact position of one or more robot axes.
This typically indicates:
This is the most common cause of BZAL alarms.
Common issues include:
1. Depleted encoder battery
2. Battery not replaced in time
3. Long-term power-off without battery backup
Without battery power, the encoder cannot retain position data.
Even a good battery cannot function if disconnected.
Common issues include:
1. Loose battery connector
2. Damaged battery cable
3. Improper battery installation
If the robot is powered off for too long without battery support:
Replacing servo components without proper procedures can trigger BZAL.
System resets can erase position data.
The following components are commonly required when resolving SRVO-070 alarms:
Browse available FANUC spare parts at inrobots.shop for fast replacement and global delivery.
Here’s a fast and effective method used by experienced FANUC technicians to pinpoint the root cause of SRVO-070 (BZAL Alarm):
Why it works:
For single-axis BZAL alarms, one of the most commonly overlooked causes is intermittent signal loss through the encoder cable. In industrial environments, encoder cables are subjected to bending, vibration, and mechanical stress. Over time, this can lead to:
Unlike complete failures, these issues often result in sporadic or recurring BZAL alarms, especially during robot motion.
Next step:
If the alarm is isolated to one axis and persists after battery replacement and mastering, inspect or replace the encoder cable. This ensures stable position feedback and prevents further alarms.
For reliable encoder signal transmission and long-term stability, consider using high-quality FANUC encoder cables designed for demanding robotic applications.
After SRVO-070 occurs:
The robot must be re-mastered before returning to production.
Skipping this step can lead to incorrect positioning and collision risks.
These alarms are closely related to encoder and position data issues.
It means Battery Zero Alarm, indicating loss of encoder position data.
Yes, mastering is required to restore correct axis positions.
Most commonly battery failure, disconnection, or extended power loss.
Not directly, but incorrect positioning after data loss can lead to collisions.
Explore the Full Guide: Industrial Robot Fault Codes Library → Fanuc Alarm Codes
Explore the complete guide for troubleshooting, repair strategies, and component replacement across industrial robot systems.
Key components commonly involved in fanuc alarm troubleshooting issues and replacements.
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