XtraDrive User Manual Chapter 9 : Inspection, Maintenance, and Troubleshooting
9-11
Overload Characteristics
Servo amplifiers have a built-in overload protection function that
protects the servo amplifiers and servo motors from overload.
Allowable power for the servo amplifiers is limited by the overload
protective function, as shown in the figure below.
The overload detection level is set under hot start conditions at a
servomotor ambient temperature of 40°C.
Note: The overload protection characteristics of A and B in the figure are applicable when the servo amplifier
is combined with one of the following servomotors:
A: SGMAH or SGMPH servomotor with a maximum capacity of 400W, 100V and 200V only.
B: Other servomotors similar to the SGMAH, SGMPH, SGMGH, SGMSH, and SGMUH.
! A.73: Dynamic Brake Overload
Display and Outputs
Alarm Outputs
Alarm Code Output
ALO1 ALO2 ALO3
ALM Output
ON ON ON OFF
Note: OFF: Output transistor is OFF (alarm state).
ON: Output transistor is ON.
Status and Remedy for Alarm
When the Servo OFF
(/S-ON) signal is
turned ON.
At power ON.
A
B
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.
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