Mitsubishi Electric MELSERVO EMC Installation Manuallines page 14

3. EMC COUNTERMEASURES
(1) Servo motor power cable
Cabinet
10cm or less
To servo
amplifier
1) Use four wires (3-phase
motor power cable. Connect the earth wire to the earth ( ) terminal on the servo amplifier and servo
motor.
Material of shield has to be copper.
2) Connect the shield of the cable to the earth on both the cabinet side and servo motor chassis side.
For the reasons why the shield is grounded on both the cabinet side and the servo motor chassis side,
refer to section 6.1. Earth the shield on the servo amplifier side at a position 10cm or less from the
cabinet. For the reasons why the shield grounding position on the servo amplifier side is specified to
be 10 cm or less from the cabinet, refer to section 6.2.
3) Earth the shield with a metal P clip or U clip. For the reasons why the P clip or U clip is specified as a
grounding method, refer to section 6.3.
POINT
If removing the insulator of a shield causes electrical shock or injuries and
threatens the machinery safety, additional protective covers or enclosures may
be required.
Earth with P or U clip
Keep as
close as
possible
Servo motor
Shield cable
Using shield cable
earth), that is completely shielded and that has no breakage for the servo
Example of connection
with P clip
Cabinet
Connector
To servo
amplifier
Example of connection
with U clip
3 - 7
Earth with surface paint removed
Conduit connector
Conduit
Servo motor
Multiple core cable
Using conduit
Connector