Mitsubishi Electric MELSERVO MR-HP30KA, Instruction Manual

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9. CHARACTERISTICS
9. CHARACTERISTICS
9.1 Overload protection characteristics
An electronic thermal relay is built in the servo amplifier and converter unit to protect the servo motor,
servo amplifier and converter unit from overloads.
Overload 1 alarm (A.50) occurs if overload operation performed is above the electronic thermal relay
protection curve shown below. Overload 2 alarm (A.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.
During servo lock
10000
1000
100
10
1
0 100
(90)
200
(180)
250
(225)
During rotation
(Note 1) Load ratio [%]
[s]
O
perat
io
n t
im
e
(Note 2)
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 servo amplifier may fail even when
the electronic thermal relay protection is not activated.
2. The values within parentheses in the graph are those in the low acoustic noise mode of the MELSERVO-H series.
Fig 9.1 Electronic thermal relay protection characteristics
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