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10. CHARACTERISTICS
10. CHARACTERISTICS
10.1 Overload protection characteristics
An electronic thermal is built in the servo amplifier to protect the servo motor, servo amplifier and servo
motor power wires from overloads.
[AL. 50 Overload 1] occurs if overload operation performed is above the electronic thermal protection curve
shown in fig. 10.1. [AL. 51 Overload 2] occurs if the maximum current is applied continuously for several
seconds due to machine collision, etc. Use the equipment on the left-side area of the continuous or broken
line in the graph.
For the system where the unbalanced torque occurs, such as a vertical axis system, the unbalanced torque
of the machine should be kept at 70% or lower of the motor's rated torque.
This servo amplifier has servo motor overload protective function. (The servo motor overload current (full
load current) is set on the basis of 120% rated current of the servo amplifier.)
1000
100
Servo-lock
10
1
0.1
0
50
100
(Note) Load ratio [%]
HG-KN13_, HG-KN23_, HG-KN43_
HG-KN73_, HG-SN52_, HG-SN102_
Note. 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 30 r/min or less low-speed operation status, the servo amplifier may malfunction regardless
of the electronic thermal protection.
Operating
150
200
250
300
320
Fig. 10.1 Electronic thermal protection characteristics
1000
100
Servo-lock
10
1
0.1
0
50
HG-SN152_, HG-SN202_, HG-SN302_
10 - 1
Operating
100
150
200
250
(Note) Load ratio [%]
300
320
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