5.13 Motor Overload Detection Level
5.13.2 Detection Timing for Overload Alarms (A.720)
5-41
5
Basic Functions That Requir
e Setting befor
e Operation
5.13.2
Detection Timing for Overload Alarms (A.720)
If Servomotor heat dissipation is insufficient (e.g., if the heat sink is too small), you can lower
the overload alarm detection level to help prevent overheating.
To reduce the overload alarm detection level, change the setting of Pn52C (Base Current Der-
ating at Motor Overload Detection).
An A.720 alarm (Continuous Overload) can be detected earlier to protect the Servomotor from
overloading.
Note: The gray areas in the above graph show where A.710 and A.720 alarms occur.
Refer to the relevant manual given below for a diagram that shows the relationships between
the motor heat dissipation conditions (heat sink size, surrounding air temperature, and derat-
ing). You can protect the motor from overloads more effectively by setting this derating value in
Pn52C.
Σ
-7-Series Rotary Servomotor with 400 V-Input Power Product Manual (Manual No.: SIEP S800001 86)
Σ
-7-Series Linear Servomotor with 400 V-Input Power Product Manual (Manual No.: SIEP S800001 81)
Pn52C
(252C
hex)
Base Current Derating at Motor Overload Detection
Setting Range
Setting Unit
Default Setting
When Enabled
Classification
10 to 100
1%
100
After restart
Setup
Speed
Position
Torque
Overload
detection time
50%
100%
A.720
A.710
200%
Detection curve
for overload
alarms when
Pn52C = 100%
(default setting)
Detection curve
for overload
alarms when
Pn52C = 50%
Torque reference (%)