Yaskawa Sigma II Series Servo System - Manual (Page 403)

Sigma II User’s Manual Chapter 9: Inspection, Maintenance, and Troubleshooting
9 - 15
Overload Characteristics
Servo amplifiers have a built-in overload protection function that protects the servo
amplifiers and servomotors from overload. Allowable power for the servo amplifi-
ers 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 ampli-
fier 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.
Rated torque
Approximate
Rated torque + Maximum torque
2
Maximum Torque
B
A
10,000
1,000
100
10
5
1
Operating T
ime (s)
Motor Torque
Low Overload
Region (A.72)
High Overload
Region (A.71)