
B-63790EN/01 4.DESCRIPTION OF PARAMETERS
- 149 -
1996 Retract amount on detecting an irregular load
[Input type] Parameter input
[Data type] Integer axis
[Unit of data] detection unit
[Valid data range] 0 - 32767
If an abnormal load is detected, the direction of the motor rotation can
be reversed. This parameter sets the amount of reverse motor rotation.
When a specified feedrate is not higher than the feedrate listed below,
and so the motor turns at a low speed, the motor stops immediately
without reversing the motor rotation. This is to prevent the motor
from turning in the reverse direction excessively.
Let A be this parameter value. When the feedrate is higher than the
feedrate indicated below in the detection unit used, the motor turns in
the reverse direction by A from the point at which an abnormal load is
detected, then stops.
Detection unit Feedrate
10 µm
1
µm
0.1
µm
0.01
µm
0.001
µm
A / 0.8 mm/ min
A / 8 mm/ min
A / 80 mm/ min
A / 800 mm/ min
A / 8000 mm/ min
If this parameter is set to 0, the motor rotation will not reversed, but it
will stop immediately when an abnormal load is detected.
Refer to the "FANUC SERVO MOTOR αi series MAINTENANCE
MANUAL (B-65285EN)" for details.
1997 Threshold value for the detection of an irregular load
[Input type] Parameter input
[Data type] Integer axis
[Unit of data] Unit of the torque command
[Valid data range] From 0 through 7282 (7282 denotes the maximum available torque
from the motor)
The irregular load alarm is generated when the load for a servo axis
exceeds this value.
The set value should be bigger than the maximum value of the load
torque observed in the setting of the parameter TDO (no.1957#5) =1.
The set value 7282 corresponds 4.4V of the observed value.
Refer to the "FANUC AC SERVO MOTOR αi series PARAMETER
MANUAL (B-65270EN)" for details.