9   Details on Servo Parameters
9 - 78
AC Servomotors/Servo Drives 1S-series with Built-in EtherCAT® Communications User’s Manual (I586)
Sets the operation of the load characteristic estimation. Refer to 11-8 Load Characteristic Estimation on 
page 11-18 for details.
 
• Selects whether to estimate load characteristics and update a value of the inertia ratio. 
 Description of Set Values
 
• Selects whether to estimate load characteristics and update a value of the viscous friction coefficient.
 
9-7-15 3B80 hex: Load Characteristic Estimation
Index 
(hex)
Sub-
index 
(hex)
Object name
Setting 
range
Unit
Default 
setting
Data 
attri-
bute
Size Access
PDO 
map
Complete 
access
Modes of 
opera-
tion
3B80 --- Load Character-
istic Estimation
--- --- --- --- --- --- --- Possible ---
00 Number of 
entries
--- --- FF hex --- 1 byte 
(U8)
RO --- --- ---
01 Inertia Ratio 
Update Selection
0 to 1 --- 1 A 4 bytes 
(INT32)
RW --- --- csp, csv, 
cst, pp, 
pv, hm
02 Viscous Friction 
Compensation 
Update Selection
0 to 1 --- 0 A 4 bytes 
(INT32)
RW --- --- csp, csv, 
cst, pp, 
pv, hm
03 Unbalanced 
Load Compensa-
tion Update 
Selection
0 to 1 --- 0 A 4 bytes 
(INT32)
RW --- --- csp, csv, 
cst, pp, 
pv, hm
04 Dynamic Friction 
Compensation 
Update Selection
0 to 1 --- 0 A 4 bytes 
(INT32)
RW --- --- csp, csv, 
cst, pp, 
pv, hm
05 Viscous Friction 
Tuning Coeffi-
cient
0 to 200 % 100 A 4 bytes 
(INT32)
RW --- --- csp, csv, 
cst, pp, 
pv, hm
06 Estimation Sensi-
tivity Selection
0 to 2 --- 1 A 4 bytes 
(INT32)
RW --- --- csp, csv, 
cst, pp, 
pv, hm
FF Estimation Status --- --- --- --- 4 bytes 
(INT32)
RO --- --- ---
Subindex 01 hex: Inertia Ratio Update Selection
Set 
value
Description
0 Use the present set value.
1 Update with the estimation result.
Subindex 02 hex: Viscous Friction Compensation Update Selection
Set 
value
Description
0 Use the present set value.
1 Update with the estimation result.