Yaskawa Large Capacity Sigma II Series - Manual (Page 178)

4 Parameter Settings and Functions
4.8.2 Wiring for Noise Control
4-102
„ Correct Grounding
Grounding the Motor Frame
Always connect servomotor frame terminal FG to the SERVOPACK ground terminal .
Also be sure to ground the ground terminal .
If the servomotor is grounded via the machine, a switching noise current will flow from the
SERVOPACK power unit through motor stray capacitance. The above grounding is required
to prevent the adverse effects of switching noise.
Noise on the Reference Input Line
If the reference input line receives 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.
For all grounding, ground at one point only.
„ Using Noise Filters
Use an inhibit type noise filter to prevent noise from the power supply line. Refer to 7.5.11
Noise Filter for details on recommended noise filters for each SERVOPACK model.
Install a noise filter on the power supply line for peripheral equipment as necessary.