3. SIGNALS AND WIRING

3.10 Grounding

Ground the servo amplifier and servo motor securely.

WARNING To prevent an electric shock, always connect the protective earth (PE) terminal of the servo amplifier with the protective earth (PE) of the control box.

The servo amplifier switches the power transistor on-off to supply power to the servo motor. Depending on the wiring and ground cablerouting, the servo amplifier 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 always ground.

To conform to the EMC Directive, refer to the EMC Installation Guidelines (IB(NA)67310).

NFB

(Note) 3-phase 200 to 230VAC, 1-phase 230VAC or 1-phase 100 to 120VAC

Control box

 

 

 

MC

Servo amplifier

CN2

 

 

 

 

L1

 

 

filter

L2

 

 

Line

 

 

L3

 

 

 

 

 

 

L11

U

 

 

L21

 

 

 

 

 

 

V

 

 

 

W

 

 

CN1A CN1B

 

 

Programmable controller

Servo motor

Encoder

U

V SM

W

Must be grounded by cable.

 

Outer

Protective earth(PE)

box

 

Note: For 1-phase 230VAC, connect the power supply to L1 L2 and leave L3 open. There is no L3 for 1-phase 100 to 120VAC power supply.

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Mitsubishi Electronics MR-J2S- A instruction manual Nfb, CN1A CN1B