Yaskawa Sigma I to Sigma-5 Conversion Guide - Manual (Page 41)

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3-4. Notes when Installing Control Board
Please note the difference of the electrical conduction state of frame ground when producing the
attachment to accommodate the difference of the installation hole size. An alarm may occur and the
machine may operate improperly because the amount of noise changes when the electrical conduction
state changes.
Control Board Side
Servo Amplifier
Control Board Side
Servo Amplifier
Attachment
The frame ground of the control
board and servo amplifier
conduct through the installation
screw.
When painting and/or surface treatment is
given to the attachment for rust prevention,
electrical conduction between the attachment
and control board may be impossible.
Conducting Part