[Pr. Pf67_Backlash Nominal Value (Bln)]; [Pr. Pf68_Backlash Threshold Multiplication (Bltt)]; [Pr. Pf69_Static Friction Failure Prediction - Average Characteristics (Spav2)]; [Pr. Pf70_Static Friction Failure Prediction - Standard Deviation (Spsd2)] - Mitsubishi Electric MELSERVO MR-J5W-B Series User Manual

[Pr. PF67_Backlash nominal value (BLN)]

Initial value
0 [0.01 degree]
To set the threshold for gear failure prediction, a backlash nominal value must be set. Input a backlash value presented by the
manufacturer of the gear connected to the servo motor.
When [Pr. PF66.0-3 Gear for backlash estimation - Numerator] or [Pr. PF66.4-7 Gear for backlash estimation - Denominator]
is set to "0", input the backlash nominal value after converting the value into the rotation angle on the servo motor side.
When [Pr. PF66.0-3] or [Pr. PF66.4-7] is set to a value other than "0", input a value considering the gear ratio for backlash
estimation.
When the setting value of this servo parameter is "0", even if backlash estimation is performed, [AL. 0F7 Machine diagnosis
warning] will not be generated.

[Pr. PF68_Backlash threshold multiplication (BLTT)]

Initial value
0
Set the threshold multiplication that will be used for setting the threshold for gear failure prediction. The threshold used for the
gear failure prediction is expressed by the following equation.
Backlash threshold = [Pr. PF67 Backlash nominal value]/100 × [Pr. PF68 Backlash threshold multiplication]/10
When the setting value of this servo parameter is "0", a value twice the value of [Pr. PF67 Backlash nominal value]/100 is set
as the backlash threshold.
When the backlash threshold is "0", [AL. 0F7 Machine diagnosis warning] will not be generated even if the backlash
estimation is performed.
[Pr. PF69_Static friction failure prediction - Average
characteristics (SPAV2)]
Initial value
0 [0.1 %]
Set a static friction torque average.
This servo parameter is enabled when [Pr. PF34.5 Static friction failure prediction warning selection] is set to "2" (manual
threshold setting).
When [Pr. PF34.5 Static friction failure prediction warning selection] is set to "1" (automatic threshold setting), the value will be
calculated automatically from the estimated static friction torque.
[Pr. PF70_Static friction failure prediction - Standard deviation
(SPSD2)]
Initial value
0 [0.1 %]
Set a standard deviation of static friction torque.
This servo parameter is enabled when [Pr. PF34.5 Static friction failure prediction warning selection] is set to "2" (manual
threshold setting).
When [Pr. PF34.5 Static friction failure prediction warning selection] is set to "1" (automatic threshold setting), the value will be
calculated automatically from the estimated friction torque at rated speed.
1 SERVO PARAMETER DETAILS
102
1.7 Extension setting 3 servo parameters group ([Pr. PF_ _ ])
Setting range
0 to 3600000
Setting range
0 to 3600000
Setting range
0 to 10000
Setting range
0 to 20000
Setting method
Each axis
Setting method
Each axis
Setting method
Each axis
Setting method
Each axis
Ver.
C4
Ver.
C4
Ver.
C4
Ver.
C4