Applicable Systems
Series 0i
Series 16/18/21
Alpha
Beta
Symptoms
An error was detected in the RAM write/read test at power-up, or input power supply is abnormal (open phase).
Possible Causes
- Servo amplifier internal hardware fault
- Power supply voltage abnormality
- Cooling system failure
- Parameter or configuration error
Troubleshooting Steps
- Step 1: Check the servo amplifier LED status display for the alarm code
LED displays the specific alarm code - Step 2: Verify the input power supply voltage and phase balance
Power supply voltage is within specification - Step 3: Check the cooling fan and heatsink for proper operation
Fan operates normally; heatsink is clean - Step 4: Inspect all cable connections between amplifier, motor, and CNC
All connections are secure - Step 5: If hardware fault, replace the servo amplifier module
New amplifier operates without alarm
How to Reset
To reset servo amplifier alarm E: 1) Identify the alarm from the amplifier LED display. 2) Check power supply and cooling. 3) Power cycle the servo amplifier. 4) If alarm persists, replace the amplifier module. Caution: Servo amplifier faults may indicate motor or cable problems; test all components before replacement.
Frequently Asked Questions
- Q: What does E mean on Fanuc FANUC Alpha/Beta Servo Amplifier?
An error was detected in the RAM write/read test at power-up, or input power supply is abnormal (open phase).
- Q: How do I fix E on Fanuc?
Follow the troubleshooting steps: Check the servo amplifier LED status display for the alarm code
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Source: FANUC Servo Amplifier Alarm Codes (tristarcnc.com)
Category: CNC
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