4.2 Specifications and Ratings
4.2.8 Servomotor Heat Dissipation Conditions
4
Specifications, Ratings, and Exter
nal Dimensions of SGM7J Servomotors
4-11
4.2.8
Servomotor Heat Dissipation Conditions
The Servomotor ratings are the continuous allowable values at a surrounding air 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.
When using Servomotors with derating, change the overload warning and overload alarm detection
timing in advance based on the overload detection level of the motor. Refer to the following section
for the overload detection level of the motor.
4.2.5 Servomotor Overload Protection Characteristics
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.
4.2.9
Applications Where the Surrounding Air Temperature of
the Servomotor Exceeds 40
°
C
The Servomotor ratings are the continuous allowable values at a surrounding air temperature of
40
°
C. If you use a Servomotor at a surrounding air temperature that exceeds 40
°
C (60
°
C max.),
apply a suitable derating rate from the following graphs.
When using Servomotors with derating, change the overload warning and overload alarm detection
timing in advance based on the overload detection level of the motor. Refer to the following section
for the overload detection level of the motor.
4.2.5 Servomotor Overload Protection Characteristics
Note: 1. Use the combination of the SERVOPACK and Servomotor so that the derating conditions are satisfied for
both the SERVOPACK and Servomotor.
2. 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 rep-
resentative.
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
120
100
80
60
40
20
150
250
300
200
100
50
0
120
100
80
60
40
20
150
250
300
200
100
50
0
SGM7J-08
SGM7J-02 and -04
SGM7J-06
Derating rate (%)
Heat sink size (mm)
Heat sink size (mm)
Heat sink size (mm)
Derating rate (%)
Derating rate (%)
100
80
120
60
40
20
0
SGM7J-C2
150
250
300
200
100
50
SGM7J-A5 and -01
100
80
120
120
60
40
0
0
100
80
60
40
0
20
20
10
20
30
40
50
60
70
0
10
20
30
40
50
60
70
SGM7J-01 and -C2
SGM7J-A5
SGM7J-02 and -04
SGM7J-06 and -08
Derating rate (%)
Derating rate (%)
Surrounding air temperature (°C)
Surrounding air temperature (°C)
