Omron SMARTSTEP A Series User Manual page 229

Troubleshooting
5-4 Overload Characteristics (Electron Thermal
Characteristics)
An overload protection (electron thermal) function is built into the Servo Driver to
protect against Servo Driver or Servomotor overload. If an overload (A.70) does occur,
first clear the cause of the error and then wait at least one minute for the Servomotor
temperature to drop before turning on the power again. If the power is turned on again
too soon, the Servomotor coil may be damaged.
Overload characteristics are shown in the following table. If, for example, a current of three times the
Servomotor's rated current flows continuously, it will be detected after approximately five seconds.
10000
1000
Note 1. The load ratio is the ratio of the motor current to the rated motor current as a percentage.
Load ratio (%) =
Note 2. For example, if a current of three times the rated motor current flows continuously, an over-
load will be detected after approximately 5 seconds.
100
A
10
5
1
100
150
A: Cylinder-style Servomotors: 30 to 400 W
Flat-style Servomotors: 100 to 400 W
B: Cylinder-style Servomotors: 750 W
Flat-style Servomotors: 750 W
Motor current
Rated motor current
B
200 250
Load ratio (%)
× 100
Chapter 5
300
5-15