Instruction manual

9 - 1
9. CHARACTERISTICS
9. CHARACTERISTICS
9.1 Overload protection characteristics
An electronic thermal relay is built in the servo amplifier to protect the linear servo motor and servo amplifier
from overloads. Overload 1 alarm (50) occurs if overload operation performed is above the electronic thermal
relay protection curve shown in any of Figs 10.1. Overload 2 alarm (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.
50 100 150 200 250 3000
0.1
10
1
100
1000
During servo lock
During
operation
Operation time [s]
Load ratio [%]
a. LM-H2 series
100 200 3000
0.1
100
10
1000
400
1
During servo lock
During
operation
Operation time [s]
Load ratio [%]
b. LM-U2 series
Fig 9.1 Electronic thermal relay protection characteristics