Grounding - YASKAWA SGD7S-1R9D Product Manual

4.1 Wiring and Connecting SERVOPACKs

4.1.3 Grounding

• If a Noise Filter is located inside a control panel, first connect the Noise Filter ground wire and
the ground wires from other devices inside the control panel to the grounding plate for the
control panel, then ground the plate.
Ground
4.1.3

Grounding

Implement grounding measures as described in this section. Implementing suitable grounding
measures will also help prevent malfunctions, which can be caused by noise.
Observe the following precautions when wiring the ground cable.
• Ground the SERVOPACK to a resistance of 10 Ω or less.
• Be sure to ground at one point only.
• Ground the Servomotor directly if the Servomotor is insulated from the machine.
Motor Frame Ground or Motor Ground
If you ground the Servomotor through the machine, switching noise current can flow from the
main circuit of the SERVOPACK through the stray capacitance of the Servomotor. To prevent
this, always connect the motor frame terminal (FG) or ground terminal (FG) of the Servomotor
to the ground terminal
Ground both the Moving Coil and Magnetic Way of a Linear Servomotor.
Noise on I/O Signal Cables
If noise enters the I/O Signal Cable, ground the shield of the I/O Signal Cable using a clamp or
other means. If the Servomotor Main Circuit Cable is placed in a metal conduit, ground the
conduit and its junction box. For all grounding, ground at one point only.
4-8
Control panel
SERVOPACK
Noise
Filter
SERVOPACK
Grounding plate
on the SERVOPACK. Also be sure to ground the ground terminal .