YASKAWA E-S Series, Product Manual

Page: 36 / 288

2.2 Ratings and Specifications
2.2.4 Servomotor Overload Protection Characteristics
2-6
2.2.4 Servomotor Overload Protection Characteristics
The overload detection level is set for hot start conditions with a Servomotor ambient tempera-
ture of 40
°
C.
Note: The above overload protection characteristics do not mean that you can perform continuous duty operation
with an output of 100% or higher.
Use the Servomotor so that the effective torque remains within the continuous duty zone given in
2.2.3
Torque-Motor Speed Characteristics on page 2-5.
2.2.5 Servomotor Heat Dissipation Conditions
The Servomotor ratings are the continuous allowable values at an ambient temperature of 40
°
C
when a heat sink is installed on the Servomotor. If the Servomotor is mounted on a small device
component, the Servomotor temperature may rise considerably because the surface for heat
dissipation becomes smaller. Refer to the following graphs for the relation between the heat
sink size and derating rate.
Note: The derating rates are applicable only when the average motor speed is less than or equal to the rated motor
speed. If the average motor speed exceeds the rated motor speed, consult with your Yaskawa representa-
tive.
Torque reference (percent of rated torque) (%)
10000
1000
100
10
1
0 50 100 150 200 250 3 00
S GM S L-A 3 C
S GM S L-A5C
Detection time (
s
)
The actual temperature rise depends on how the heat sink (i.e., the Servomotor mounting sec-
tion) is attached to the installation surface, what material is used for the Servomotor mounting
section, and the motor speed. Always check the Servomotor temperature with the actual equip-
ment.
Important
100
80
60
40
20
150 250 200 100 50 0
Heat s ink s ize (mm)
150 250 200
100
50 0
Heat s ink s ize (mm)
100
120
120
80
60
40
20
S GM S L-A 3 C S GM S L-A5C
Derating rate (%)
Derating rate (%)