Yaskawa FSP Amplifier - Manual (Page 321)

FSP Amplifier User’s Manual Appendix B: Special Wiring
B-6
„ Correct Grounding
Grounding the Motor Frame
Always connect servomotor’s frame terminal FG to the FSP Amplifier’s
ground terminal
. Also be sure to ground the ground terminal . If the
servomotor is grounded via the machine, switching noise current will flow
from the servo amplifier power unit through motor stray capacitance. The
grounding of the motor frame is required to prevent the adverse effects of
switching noise.
Noise on the Reference Input Line
If the reference input line is affected by noise, ground the 0 V line (SG) of
the reference input line. If the main circuit wiring for the motor is
accommodated in a metal conduit, ground the conduit and its junction box.
All grounds must be made to only one point in the system.