Grounding - YASKAWA E-S Series Product Manual

4.1 Wiring Precautions

4.1.3 Grounding

• Connect the Noise Filter ground wire directly to the grounding plate. Do not connect the
Noise Filter ground wire to other ground wires.
Grounding plate
• 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 100 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 ground terminal (FG) of the Servomotor to the ground terminal on the
SERVOPACK.
4-6
Incorrect
Noise
Filter
SERVOPACK SERVOPACK
Shielded
ground wire
Grounding plate
Control panel
AC/DC
converter
Noise
Filter
Grounding plate
Correct
Noise
Filter
SERVOPACK SERVOPACK
SERVOPACK
SERVOPACK