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7 Operation
7.3.6 Setting Motor Overload Detection Level
7-16
(2) Changing Detection Timing of Overload (Low Load) Alarm (A.720)
An overload (low load) alarm (A.720) can be detected earlier to protect the servomotor from overloading. The
time required to detect an overload alarm can be shortened by using the derated motor base current obtained
with the following equation.
Note: The detection level of the overload (high load) alarm (A.710) cannot be changed.
Motor base current
×
Derating of base current at detecting overload of motor (Pn52C)
= Derated motor base current
Motor base current: Threshold value of motor current to start calculation for overload alarm
Derating of base current at detecting overload of motor (Pn52C): Derating of motor base current
A graph of the relation between the size of the heat sink and derating is provided in
3.1.4 Heat Dissipation
Conditions
. Use this graph as a guild for the heat dissipation conditions of the motor. Changing the setting of
Pn52C will change the detection timing of the overload alarm, so the time required to detect the overload
warning will also be changed.
Å@
Note: For details, refer to
3.1.1
,
(3) Overload Characteristics
.
Derating of Base Current at Detecting Overload of Motor
Classification
Pn52C
Setting Range
Setting Unit
Factory Setting
When Enabled
10 to 100
1%
100
After restart
Setup
50%
100%
200%
Detection curve of
overload alarm when
Pn52C=100%
(factory setting)
Detection curve of
overload alarm
when Pn52C=50%
Torque reference [%]
Overload detection time
Speed
Position
Torque