Servomotor Overload Protection Characteristics; Servomotor Heat Dissipation Conditions - YASKAWA E-S Series Product Manual

2.2 Ratings and Specifications

2.2.4 Servomotor Overload Protection Characteristics

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.
10000
1000
100
10
1
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.
Important
120
100
80
60
40
20
0
2-6
SGMSL-A3C
0 50 100
Torque reference (percent of rated torque) (%)
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.
SGMSL-A3C
120
100
80
60
40
20
50 100 150 200 250
Heat sink size (mm)
SGMSL-A5C
150 200 250
SGMSL-A5C
100
0 50 150 200 250
Heat sink size (mm)
300