Yaskawa Sigma II Series Servo System - Manual (Page 404)

Sigma II User’s Manual Chapter 9: Inspection, Maintenance, and Troubleshooting
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A.73
A.73: Dynamic Brake Overload
Display and Outputs
Note: OFF: Output transistor is OFF (alarm state).
ON: Output transistor is ON.
Status and Remedy for Alarm
Alarm Outputs
Alarm Code Output
ALM Output
ALO1 ALO2 ALO3
ON ON ON OFF
Cause of the Problem Solution
A
The product of the square of rotational motor
speed, the combined inertia of the motor,
and load (rotation energy) exceeds the
capacity of the dynamic brake resistor built
into servo amplifier.
• Reduce the rotational speed.
• Decrease the load inertia.
• Minimize use of the dynamic brake.
B Defective circuit board (1PWB). Replace servo amplifier.
When the Servo OFF (/S-ON)
signal is turned ON.
At power ON. A B