Mitsubishi Electric MELSERVO EMC Instruction sheet

Mitsubishi Electric AC Servo System

EMC Installation

Guidelines

CONTENTS

1. SUMMARY 1 - 1 to 1 - 2

2. EMC DIRECTIVE 2 - 1 to 2 - 2

3. EMC COUNTERMEASURES 3 - 1 to 3 -10

3.1 Basic EMC countermeasures .................................................................................................................. 3 - 1

3.2 Cabinet design ......................................................................................................................................... 3 - 1

3.3 Filter wiring and installation...................................................................................................................... 3 - 4

3.4 Cable treatment........................................................................................................................................ 3 - 6

4. EMC COUNTERMEASURE PARTS 4 - 1 to 4 - 12

4.1 Noise filter (For controller power supply)................................................................................................. 4 - 1

4.2 EMC filter (For servo amplifier power supply) ......................................................................................... 4 - 1

4.3 Ferrite core (Data line filter) ..................................................................................................................... 4 - 7

4.4 Shield clamp fitting ................................................................................................................................... 4 - 8

4.5 Line noise filter ......................................................................................................................................... 4 - 8

4.5.1 Connection example ......................................................................................................................... 4 - 8

4.5.2 Precautions....................................................................................................................................... 4 -10

4.6 Surge protector........................................................................................................................................ 4 -11

5. CONNECTION EXAMPLE FOR EMC COUNTERMEASURES 5 - 1 to 5 - 4

5.1 For 22kW or less of 1-axis ....................................................................................................................... 5 - 1

5.2 For 1kW or less of multi axis.................................................................................................................... 5 - 2

5.3 For 30kW or more .................................................................................................................................... 5 - 3

6. SUPPLEMENT 6 - 1 to 6 - 6

6.1 Reasons why the shield is grounded on both the cabinet side and the servo motor chassis side ....... 6 - 1

6.1.1 Grounding the shield at the servo amplifier side only ...................................................................... 6 - 1

6.1.2 Grounding the shield at both ends of the cable................................................................................ 6 - 2

6.2 Reasons why the grounding position in the cabinet is specified to be 10 cm or less from the

cabinet exit ............................................................................................................................................... 6 - 3

6.3 Reasons why the shield must be grounded with the P clip or U clip...................................................... 6 - 3

6.4 Connecting multiple servo amplifiers to one EMC filter (1: n connection) ............................................. 6 - 4

6.4.1 Selection method............................................................................................................................... 6 - 4

6.4.2 Selection example ............................................................................................................................. 6 - 5

1 - 1

1. SUMMARY

We have carried out EMC standard compliance confirmation tests with the servo amplifier in the installation

environment described in this manual. After incorporating the servo amplifier in the machine or equipment,

confirm the EMC standard compliance of the entire machine or equipment on customer side.

For the EMC countermeasures, refer to this guideline or the instruction manual of the servo amplifier used.

1 - 2

1. SUMMARY

MEMO

2 - 1

2. EMC DIRECTIVE

Mitsubishi Electric general-purpose AC servo MELSERVO complies with products standard EN 61800-3. This

directive largely regulates the following two withstand levels.

(1) Emission (EMI: Electromagnetic Interference)

Capacity to prevent output of obstructive noise that adversely affects external sources.

(2) Immunity (EMS: Electromagnetic Susceptibility)

Capacity to not malfunction due to obstructive noise from external source.

The details of each level are classified below.

Class Name Details Products

standard

Emission

(EMI)

Radiated noise Electromagnetic noise radiated through the air,

etc.

EN 61800-3

Conducted noise Electromagnetic noise discharged from power

supply line, etc.

Immunity

(EMS)

Electrostatic discharge immunity test

IEC 61000-4-2

Noise from a charged human body, etc.

Radiated, radio-frequency, electromagnetic

field immunity test

IEC 61000-4-3

Electromagnetic noise from wireless transmitters

or broadcasting companies, etc.

Electrical fast transient/burst immunity test

IEC 61000-4-4

Relay noise or electromagnetic noise caused by

live electricity being turned on or off, etc.

Immunity to conducted disturbances,

induced by radio-frequency fields

IEC 61000-4-6

Electromagnetic noise flowed from power supply

wires or earthing wires, etc.

Power-frequency magnetic field immunity

test

IEC 61000-4-8

Electromagnetic noise of 50/60Hz power supply

frequency, etc.

Voltage dips, short interruptions and

voltage variations immunity tests

IEC 61000-4-11

Power supply drop, etc.

Surge immunity test

IEC 61000-4-5

Electromagnetic conducted noise discharged by

thunder, etc.

2 - 2

2. EMC DIRECTIVE

MEMO

3 - 1

3. EMC COUNTERMEASURES

CAUTION

The servo amplifier must be installed in the metal cabinet.

3.1 Basic EMC countermeasures

POINT

According to the NFPA79 approved by the United States, when the shielded

wire is not used for wiring between a servo amplifier and a servo motor, the

wiring must be insulated from wiring of other control or signal circuits.

(Example: 100 mm or more for 20 A or less)

Take the following measures firmly as EMC countermeasures.

(1) Install the device in a sealed metal cabinet.

(2) Install a noise filter.

(3) Accurately earth the device.

(4) Use shielded wires for cables and wires.

(5) Separate the primary-side wiring and the secondary-side wiring as far as possible.

(6) Install the surge protector. (Refer to section 4.6.)

3.2 Cabinet design

The servo is a complex component incorporated into another machine. It must always be installed in a cabinet.

The design of the cabinet is a very important factor for EMC countermeasures, so please take the following

points into consideration.

(1) Use a metal cabinet.

(2) Accurately earth the cabinet unit with a thick and short cable.

3 - 2

3. EMC COUNTERMEASURES

(3) Weld or screw close the joining sections of the cabinet's top plate and side plate. Keep the joining

clearance to 10cm or less. The diameter of the openings on the cabinet such as the ventilation hole should

be 10cm or less. If there are holes larger then this, plug them with metal plates or punched metal. In this

case, such as when painted surfaces are to be connected, make sure that there is a good electrical

connection to prevent antenna effect.

Example)

Remove paint

Hole exceeding

10cm

Faraday cage effect grill

Provide an electrical continuity.

(4) The door of the cabinet must be accurately earthed with the cabinet. If the door earthing is insufficient, the

door itself will act as a large antenna and will radiate noise.

Take the following measures for this.

1) Use a metal door.

2) Connect the door and cabinet with thick braided wire at as many points as possible.

3) Use an EMI gasket or conductive packing for the contact between the door and cabinet.

Cabinet

Metal cabinet

Enforce conductance treatment on

sections that the EMI gasket contacts.

EMI gasket

Packing

door

3 - 3

3. EMC COUNTERMEASURES

(5) To take preventive measures against the noise of the input power source cable in the cabinet, install the

shielding partition at nearby site where the power is input so that the input power cable does not receive

harmful effects of the radiated noise.

AC input

Filter MCCB

Radiated noise

Cabinet

AC input

Filter MCCB

Radiated noise

Shielding

partition

Controller Servo amplifier Controller Servo amplifier

Cabinet

The power supply line noise is

eliminated by the filter, but cable

contains noise again because of the

noise radiated in the cabinet.

Use a metal plate, etc., for the

shielding partition.

Make sure there are no gaps.

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