Detection Timing For Overload Alarms (A.720) - YASKAWA SGD7S-1R9D Product Manual

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).
Base Current Derating at Motor Overload Detection
Pn52C
(252C Setting Range
hex)
An A.720 alarm (Continuous Overload) can be detected earlier to protect the Servomotor from
overloading.
Overload
detection time
50% 100%
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)
Setting Unit
10 to 100 1%
A.720 A.710
Detection curve
for overload
alarms when
Pn52C = 100%
(default setting)
Detection curve
for overload
alarms when
Pn52C = 50%
200%
Torque reference (%)
5.13 Motor Overload Detection Level

5.13.2 Detection Timing for Overload Alarms (A.720)

Speed
Default Setting When Enabled
100 After restart
Position Torque
Classification
Setup
5-41
5