Hitachi NES1-002SBE, NES1-004SBE Installation Manual

Electromagnetically Compatible Installation Guide Book

Inverter Series
NE-S1

Hitachi Europe GmbH

C O N T E N T S

CHAPTER 1 – WARNINGS AND INSTRUCTIONS ................................................ 1-1

CHAPTER 2 – ELECTROMAGNETICALLY COMPATIBLE

INSTALLATION OF DRIVES AND DRIVE SYSTEMS .......................................... 2-1

INTRODUCTION ............................................................................................................... 2-1

SELECTION OF LINE FILTER TO REDUCE LINE-CONDUCTED INTERFERENCE ...................... 2-2

FILTER INSTALLATION .................................................................................................... 2-3

MINIMIZING RADIATED INTERFERENCE ........................................................................... 2-5

USING EMC COMPLIANT CABLES ................................................................................... 2-6

INSTALLING THE MOTOR CABLE ...................................................................................... 2-7

INSTALLING CONTROL AND SIGNAL LINES ....................................................................... 2-7

SHIELDING AND GROUNDING FOR INSTALLATION IN SWITCH CABINETS ........................... 2-8

CHAPTER 3 – INFLUENCE OF THE MOTOR CABLE LENGTH ....................... 3-1

CHAPTER 4 – FURTHER NOTES.............................................................................. 4-1

INFLUENCE OF GROUND FAULT MONITORING DEVICES .................................................... 4-1

COMPONENTS SUSCEPTIBLE TO INTERFERENCE ............................................................... 4-1

CHAPTER 5 – TECHNICAL SPECIFICATIONS AND DIMENSIONS OF NE-

S1 FILTER ...................................................................................................................... 5-1

CHAPTER 6 –HARMONICS ...................................................................................... 6-1

Chapter 1 – Warnings and instructions

1-1

Chapter 1 – Warnings and Instructions

WARNING The motor cable should be kept as short as possible in order to avoid

electromagnetic emission as well as capacitive currents. The rapid voltage
changes of the Hitachi NE-S1 series cause capacitive currents through the
motor cable stray capacitances.
The cable length increases the capacitive current and electromagnetic
emission.
It is recommended that the motor cable length does not exceed 50m.

It is always recommended to install output AC-Reactors (motor
chokes) if the cable length exceeds 50 m.

WARNING The filters contain capacitors between the phases and the phases to ground

as well as suitable discharging resistors. But after switching off the line
voltage you should wait a minimum of 60 seconds before removing
protective covers or touching terminals etc. Ignore this and you may get an
electric shock!

WARNING The protective conductor connection between filter and drive must be

designed as a solid and permanent installation. Plug-in connections are not
permissible.

WARNING The use of ground fault monitoring devices is not recommended. Should

they be compulsory in certain applications for safety reasons, you should
choose monitoring devices which are suited for DC-, AC- and HF-ground
currents.

WARNING The thermal capacity of the line filter is guaranteed up to a maximum

motor cable length of 50 m.

WARNING The line filters have been developed for use in grounded systems. Use in

ungrounded systems is not recommended.

WARNING The Hitachi NE-S1 series is not intended for sales to general public but a

professional equipment to be used in trades, professions and industries.

If installed according to the following directions, the frequency inverter comply with the
following standards:
Emmissions: EN 61800-3 (EN 55011 group 1, Category C1/C2/C3[Class B/A])
Immunity: EN 61800-3, industrial environments

Chapter 2 – Electromagnetically compatible installation of drives and drive systems

2-1

Chapter 2 – Electromagnetically Compatible

Installation of Drives and Drive Systems

Introduction

This brochure describes the electromagnetically compatible setup of your drive or your drive
system. (Electro Magnetic Compatibility = EMC)

Read this information carefully and follow the instructions. If necessary, provide this infor-
mation to third parties.

HF interference results from rapid switching of electric currents and voltages. All AC, DC and
servo drives very rapidly switch large currents and voltages to optimally supply connected electric
motors. They are thus major sources of interference, generating both line-conducted and radiated
interference.

The additional use of line filters, also called interference suppression filters, and installation in a
metal housing or a switch cabinet further improve the existing interference immunity. For the best
possible damping of interference, special line filters have been developed which guarantee you
easy assembly and installation along with the necessary electrical reliability.

However, effective EMC is only ensured if the suitable filter is selected for the particular drive and
installed in accordance with these EMC recommendations.

Chapter 2 – Electromagnetically compatible installation of drives and drive systems

2-2

Selection of line filter to reduce line-conducted interference

To reduce line-conducted interference, use the appropriate line filter for each frequency inverter.
The table below show you a list of the available line filters for your Hitachi frequency inverter.

The all line filters are built in the so-called footprint style, are fitted behind the respective
frequency inverter, and thus require no additional space for installation. These filters are intended
for installation in switch cabinets as standard.

Vertical mounting next to the frequency inverter is also possible.

Note: All filters are designed for 50/60Hz.

Frequency Inverter

Line Power spcification

Line Filter

NES1-002,004SBE

1 ~ 200 V -10% to 240V +5%

FPF-9120-10-SW

NES1-007SBE

FPF-9120-14-SW

NES1-015,022SBE

FPF-9120-24-SW

NES1-004,007HBE

3 ~ 380 V -10% to 460V +5%

FPF-9340-05-SW

NES1-015,022,040HBE

FPF-9340-10-SW

Chapter 2 – Electromagnetically compatible installation of drives and drive systems

2-3

Filter installation

The connecting cable between filter and frequency inverter must be as short as possible and laid
separate from other cables/lines.

As user you must ensure that the HF impedance between frequency inverter, filter and ground is as
small as possible:

 Remove paint and insulating material between the individual mounting points.
 See to it that the connections are metallic and have the largest possible areas.
 Use conductive contact grease as anticorrosive.

Anodized and yellow-chromated surfaces, e.g. cable/standard-section rail, screws, etc., have
a large HF-impedance.

This paint must thus be removed at mounting points.
Ensure that the protective conductor terminal (PE) of the filter is properly connected with the

protective conductor terminal of the frequency inverter. An HF ground connection via metal
contact between the housings of the filter and the frequency inverter, or solely via cable shield, is

not permitted as protective conductor connection. The filter must be solidly and permanently
connected with the ground potential so as to preclude the danger of electric shock upon touching

the filter if a fault occurs. You can achieve this by:

 connecting it with a grounding conductor of at least 10mm2.
 connecting a second grounding conductor, connected with a separate grounding terminal,

parallel to the protective conductor.

The cross section of each single protective conductor terminal must be designed for the required
nominal load.

Conductor loops act like antennas, especially when they encompass large areas. Consequently:

 Avoid unnecessary conductor loops.
 Avoid parallel arrangement of “clean” and interference-prone conductors over longer

distances.

The line filters have been developed for use in grounded systems. Use of the line filters in
ungrounded systems is not recommended, because in these applications

 loss current to ground increases.
 the effect of the filter is reduced.

The amount of line-conducted and radiated interference increases in proportion to elementary
frequency in frequency inverter.