Alarm Detection Settings - YASKAWA E-7S SERVOPACK SGD7S Product Manual

10.3.6

Alarm Detection Settings

This section describes the alarm detection settings (Pn51B and Pn52A).
Pn51B (Motor-Load Position Deviation Overflow Detection
Level)
This setting is used to detect the difference between the feedback position of the Servomotor
encoder and the feedback load position of the external encoder for fully-closed loop control.
If the detected difference exceeds the setting, an A.d10 alarm (Motor-Load Position Error Over-
flow) will be output.
Motor-Load Position Deviation Overflow Detection Level
Setting Range
Pn51B
1,073,741,824
Note: If you set this parameter to 0, A.d10 alarms will not be output and the machine may be damaged.
Pn52A (Multiplier per Fully-closed Rotation)
Set the coefficient of the deviation between the Servomotor and the external encoder per Ser-
vomotor rotation.
This setting can be used to prevent the Servomotor from running out of control due to damage
to the external encoder or to detect belt slippage.
 Setting Example
Increase the value if the belt slips or is twisted excessively.
If this parameter is set to 0, the external encoder value will be read as it is.
If you use the default setting of 20, the second rotation will start with the deviation for the first
Servomotor rotation multiplied by 0.8.
Deviation between Servomotor and external encoder
Large
Small
1st rotation
 Related Parameter
Multiplier per Fully-closed Rotation
Pn52A Setting Range
Setting Unit
0 to
1 reference unit
Number of Servomotor rotations
2nd rotation
Setting Unit
0 to 100 1%
10.3 Parameter Settings for Fully-Closed Loop Control
Default Setting When Enabled
1000 Immediately
3rd rotation 4th rotation
Default Setting When Enabled
20 Immediately

10.3.6 Alarm Detection Settings

Classification
Setup
Pn52A = 0
Pn52A = 20
Pn52A = 100
Classification
Setup
10
10-9