Chapter 5
5-15
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.
Note 1. The load ratio is the ratio of the motor current to the rated motor current as a percentage.
Load ratio (%) =
× 100
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.
Operation time (s)
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
150 300
10000
1000
100
10
5
1
A
B
100
200 250
Load ratio (%)
Motor current
Rated motor current
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