8 - 1
8. CHARACTERISTICS
8. CHARACTERISTICS
8.1 Overload protection characteristics
An electronic thermal relay is built in the servo amplifier to protect the servo motor and servo amplifier
from overloads. The operation characteristics of the electronic thermal relay are shown below. 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 stop
10000
1000
100
10
1
0
100
(90)
200
(180)
300
(270)
During rotation
Load ratio [%]
[s]
O
p
e
ra
ti
on t
im
e
Summary of Contents for Melservo-H Series
Page 11: ... 4 MEMO ...
Page 23: ...1 12 1 FUNCTIONS AND CONFIGURATION MEMO ...
Page 41: ...3 16 3 SIGNALS AND WIRING MEMO ...
Page 49: ...4 8 4 DISPLAY SECTION AND OPERATION SECTION OF THE CONVERTER UNIT MEMO ...
Page 61: ...7 6 7 OUTLINE DIMENSIONAL DRAWINGS MEMO ...
Page 81: ...9 16 9 OPTIONS AND AUXILIARY EQUIPMENT MEMO ...
Page 91: ...App 10 APPENDIX MEMO ...