M730L CNC: "S01 Aux ax absolute posn lost" and "Z71 Aux ax drop voltage"
Опубликовано
In this video, we troubleshoot a misleading diagnostic error on a Mitsubishi 730L CNC (as seen on a Mazak PT20)
. We encountered two primary alarms on the indexing auxiliary axis (ATC drive): Z71 0001 "Aux ax drop voltage" and S01 0025 "Aux ax absolute posn lost"
.
The Z71 description "drop voltage" is highly misleading because it suggests a battery failure, yet our battery tested at a healthy 3.6VDC
. The actual root cause was a failure in the servomotor (HC-SF152K) and the encoder cable
. Once those components were replaced, the Z71 alarm persisted until we performed a manual origin position set
.
Key Takeaways:
Misleading Alarm: The Z71 0001 alarm description on the CNC screen ("drop voltage") does not match the official MR-J2-CT manual (BNP-B3944J), which defines it as "Absolute position detector data lost"
.
Troubleshooting Steps: We demonstrate how to navigate to the Maintenance - Auxiliary Test screen to perform the "Origin position set" procedure and clear the S01/Z71 error loop
.
The Solution: After replacing the motor and cable and resetting the absolute position, the machine was returned to service
.
This video highlights a software discrepancy that Mitsubishi should address to prevent maintenance teams from wasting time on battery replacements when the issue is actually in the detector feedback path.
Hashtags
#CNC #MitsubishiElectric #Mazak #Maintenance #Machining #Troubleshooting #CNCOperator #Engineering #ServoDrive #IndustrialAutomation
. We encountered two primary alarms on the indexing auxiliary axis (ATC drive): Z71 0001 "Aux ax drop voltage" and S01 0025 "Aux ax absolute posn lost"
.
The Z71 description "drop voltage" is highly misleading because it suggests a battery failure, yet our battery tested at a healthy 3.6VDC
. The actual root cause was a failure in the servomotor (HC-SF152K) and the encoder cable
. Once those components were replaced, the Z71 alarm persisted until we performed a manual origin position set
.
Key Takeaways:
Misleading Alarm: The Z71 0001 alarm description on the CNC screen ("drop voltage") does not match the official MR-J2-CT manual (BNP-B3944J), which defines it as "Absolute position detector data lost"
.
Troubleshooting Steps: We demonstrate how to navigate to the Maintenance - Auxiliary Test screen to perform the "Origin position set" procedure and clear the S01/Z71 error loop
.
The Solution: After replacing the motor and cable and resetting the absolute position, the machine was returned to service
.
This video highlights a software discrepancy that Mitsubishi should address to prevent maintenance teams from wasting time on battery replacements when the issue is actually in the detector feedback path.
Hashtags
#CNC #MitsubishiElectric #Mazak #Maintenance #Machining #Troubleshooting #CNCOperator #Engineering #ServoDrive #IndustrialAutomation