A - 171
 Appendices
AC Servomotors/Servo Drives 1S-series with Built-in EtherCAT® Communications User’s Manual (I586)
A-4  Sysmac Error Status Codes
A
A-4-2  Error Descriptions
 
Event name Overload Warning Event code 387A0000 hex
Description
The Load Ratio of Servo Drive or motor (4150-81 hex) exceeded the level set in the Overload - Warning 
Notification Level (4150-01 hex).
Source
EtherCAT Master Function Mod-
ule
Source details
Slave
Detection 
timing
Continuously
Error 
attributes
Level
Observation
*1
*1. You can change the level to minor fault by using Warning Level Change 1 Selection (4020-05 hex).
Recovery
---
Log category
System log
Effects User program Continues. Operation Not affected.
Indicators
EtherCAT NET RUN EtherCAT NET ERR EtherCAT LINK/ACT
--- --- ---
System
-defined 
variables
Variable Data type Name
None None None
Cause and
correction
Assumed cause Correction Prevention
Operation was continued for a 
long time with high load.
Perform the following corrections 
accordingly.
• Increase the set value of the 
acceleration/deceleration time 
and the stop time.
• Lighten the load.
• Adjust the gain or inertia ratio.
• If torque waveforms oscillate 
excessively, adjust the system 
by the tuning so that the oscilla-
tion does not occur.
• Set the appropriate brake timing.
• Increase the capacities of the 
Servo Drive and the motor.
Check the items given for correc-
tions in advance and take counter-
measures as required.
There is incorrect wiring of the 
motor cable or a broken cable
• Connect the motor cable as 
shown in the wiring diagram. If 
the cable is broken, replace it. 
Or, connect the motor cable and 
encoder cable that are used 
together to the same motor.
• Measure the voltage at the 
brake terminal. If the brake is 
applied, release it.
Connect the motor cable as shown 
in the wiring diagram. Connect the 
motor cable and encoder 
cable/external encoder cable that 
are used together to the same 
motor.
Increase in friction Check machine conditions and 
remove the cause of the friction.
Take countermeasures so that 
machine distortion is not gener-
ated.
Attached 
information
Attached Information 1: Cause Details
1: The Servo Drive is overloaded
2: The Servomotor is overloaded
Precautions/
Remarks
AL status code: -, Error No.: A000 hex