System Alarm: Communication or Parameter Setting Error
Fanuc · αi Series Servo Amplifier
What does Alarm 4 mean?
This alarm can indicate two primary issues depending on the set bits. If DTE, CRC, and STB bits are set, it signifies a communication alarm in the serial pulse coder, potentially due to noise, cable issues, or defective hardware. If the PRM bit is set, it indicates an invalid parameter setting detected by the servo software.
Repair Steps
- 1
If DTE, CRC, and STB bits are set, verify the physical cable connection for the serial pulse coder and check for any line disconnections.
- 2
If DTE, CRC, and STB bits are set, implement thorough noise-preventive measures. If the alarm persists continuously after power-on, consider replacing the pulse coder, the control board of the amplifier (α i series), or the pulse module (α i series).
- 3
If the PRM bit is set, investigate the cause of the invalid parameter setting according to Subsection 2.1.5, "Actions for Invalid Servo Parameter Setting Alarms."