Yaskawa Σ-II Series - Manual (Page 34)

E-32
15 Overload Characteristics
SERVOPACKs have a built-in overload protective function that protects the SERVOPACKs and
servomotors from overload. Allowable power for the SERVOPACKs 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 surrounding air
temperature of 40
°C (104°F).
* A hot start indicates that both the SERVOPACK and the servomotor have
run long enough at the rated load to be thermally saturated.
Note: The overload protection characteristics of A and B in the figure are
applicable when the SERVOPACK is combined with one of the
following servomotors.
A: SGMAH or SGMPH servomotor with a capacity of maximum
400 W.
B: SGMAH or SGMPH servomotors with a capacity more than
400 W and SGMGH, SGMSH,
SGMDH, and SGMUH servomotors.
10000
1000
100
10
5
1
Detecting time (s)
B
A
Rated torque
(Rated current)
Maximum torque
(Maximum current)
Maximum torque
Rated torque
× 100%
100%
Rated torque + Maximum torque
2
Approx.