Yaskawa Junma Series SERVOPACK - Manual (Page 92)

8.3 Overload Protection Characteristics
E-91
English
8.3 Overload Protection Characteristics
The SERVOPACK provides a function to protect the servomotor and SERVOPACK from overloads.
• If an overload alarm occurs, remove the cause of the alarm and wait for at least one minute. Turn
ON the servomotor again after the servomotor has cooled sufficiently. If the operation of the ser-
vomotor is repeated within a short time, the servomotor coil may burn out.
• Use a correct combination of the SERVOPACK and servomotor.
• Overload protection characteristics are the values used when the motor attached to the alumi-
num heatsink [250 mm × 250 mm × 6 mm (23.62 in × 23.62 in × 0.24 in)] at the ambient temper-
ature of 40 °C (104 °F). Make sure to use the SERVOPACK in the recommended operating
conditions.
• When using SERVOPACKs with a 100 VAC power supply, depending on the motor speed, an
overload alarm may occur even if values are within the allowable range for the overload protec-
tion characteristics shown in the following figures.
The overload protection characteristics are shown below.
Note: The servomotor torque is given as a percentage of the rated torque.
NOTE
1000
100
10
1
100 150 200 250 300
Motor torque (%)
Time (s)
SJME-01 100W)
Example: If the Servomotor torque is 300 %,
an overload alarm will occur in
approximately two seconds.
1000
100
10
1
100 150 200 250 300
Motor torque (%)
SJME-02 200W) to SJME-08(750W)
Time (s)