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15. SERVO AMPLIFIERS WITH A LARGE CAPACITY
(
30k TO 55kW
)
15.8 Characteristics
15.8.1 Overload protection characteristics
An electronic thermal relay is built in the converter unit and drive unit to protect the servo motor, converter unit,
drive unit and servo motor power line from overloads.
Overload 1 alarm (AL.50) occurs if overload operation performed is above the electronic thermal relay
protection curve shown below. Overload 2 alarm (AL.51) occurs if the maximum current flew continuously for
several seconds due to machine collision, etc. Use the equipment on the left-hand side area of the continuous
or broken line in the graph.
It is recommended to use the machine which generates unbalanced torque, e.g. a vertical lift application, so
that the unbalanced torque is not more than 70
of the rated torque.
Servo amplifier MR-J3 series has solid-state servo motor overload protection. (The motor full load current is
115
rated current.)
10000
1000
100
10
1
0 100 200 250
In rotation
(Note 2)
Operation time [s]
Load ratio [%]
Converter unit
10000
1000
100
10
1
0 100 200 250
In servo lock
In rotation
(Note 2)
Operation time [s]
(Note 1) Load ratio [%]
Drive unit
Note 1. If operation that generates torque more than 100 of the rating is performed with an abnormally high frequency in a servo
motor stop status (servo lock status) or in a 30r/min or less low-speed operation status, the drive unit may fail even when the
electronic thermal relay protection is not activated.
2. Load ratio 100
indicates the rated output of each converter unit and drive unit. Refer to section 15.1.4 for rated output.
Fig. 15.1 Overload protection characteristics