Alarm Detection Settings - YASKAWA SGD7S Product Manual

10.3.7

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 motor
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 Deviation
Overflow) will be output.
Motor-Load Position Deviation Overflow Detection Level
Pn51B
1,073,741,824
Note: An A.d10 alarm will not be output if this parameter is set to 0.
Pn52A (Multiplier per Fully-closed Rotation)
Set the coefficient of the deviation between the motor and the external encoder per motor rota-
tion.
This setting can be used to prevent the motor 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
motor rotation multiplied by 0.8.
Deviation between motor and external encoder
Large
Small
1st rotation
 Related Parameters
Multiplier per Fully-closed Rotation
Pn52A Setting Range
Setting Range Setting Unit
0 to
1 reference unit
2nd rotation
Setting Unit
0 to 100 1%
10.3 Parameter Settings for Fully-Closed Loop Control
Default Setting
1000
Motor speed
3rd rotation 4th rotation
Default Setting
20

10.3.7 Alarm Detection Settings

Position
Classifica-
When Enabled
tion
Immediately Setup
Pn52A = 0
Pn52A = 20
Pn52A = 100
Position
When Enabled Classification
Immediately Setup
10
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