3 SIGNALS AND WIRING
3.8 Grounding
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3.8
Grounding
The drive unit supplies power to the servo motor by switching on and off a power transistor. Depending on the wiring and
ground wire routing, the drive unit may be affected by the switching noise (due to di/dt and dv/dt) of the transistor. To prevent
such a fault, refer to the following diagram and ground it.
For information on how to comply with the EMC Directive, refer to "EMC Installation Guidelines".
*1 For the power supply specifications, refer to "Drive unit standard specifications" in the User's Manual (Introduction) and "Standard
specifications" in the "MR-CV Power Regeneration Converter Unit User's Manual".
*2 To ground the servo motor, connect the grounding lead wire to the drive unit, and then connect the wire from the drive unit to the ground
via the protective earth (PE) terminal of the cabinet. Do not connect the wire directly to the protective earth (PE) terminal of the cabinet.
*3 Install the MR-AL-_ AC reactor.
L1
L2
L3
L+
L-
L+
L-
L+
L-
MC
MCCB
L+
L-
*2
V
U
U
E
V
W
W
CN2A
M
*2
V
U
U
E
V
W
W
E
E
CN2A
M
Power supply
*1
Cabinet
Line noise
filter
AC reactor
*3
Drive unit
Controller
Drive unit
Outer box
Protective earth (PE)
Servo motor
Encoder
Servo motor
Encoder
Converter unit
