ZIEHL-ABEGG Z-D-15 Series User manual

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L-BAL-E321-D 2021/11 Index 002
Z-D-15/35/55E-..
Active Harmonic Filter with SiC Technology
Operating Instructions
Index 002
Keep for reference!

Operating Instructions Z-D-15/35/55E-..
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Content
1General.............................................................................................................................................4
1.1 Manufacturer............................................................................................................................ 4
1.2 Meaning of the instructions...................................................................................................... 4
1.3 Validity..................................................................................................................................... 4
1.4 Terms and definitions .............................................................................................................. 4
1.5 Intended use............................................................................................................................ 5
1.6 Improper use............................................................................................................................ 5
2Safety precautions..........................................................................................................................6
2.1 What this chapter contains...................................................................................................... 6
2.2 Safety definitions and warning symbols .................................................................................. 6
2.3 General safety information ...................................................................................................... 8
2.4 Safety responsible persons................................................................................................... 10
2.5 Specification of wires and cables .......................................................................................... 10
2.6 Rest danger........................................................................................................................... 10
3Fast start ....................................................................................................................................... 11
3.1 What this chapter contains.................................................................................................... 11
3.2First check when unpacking.................................................................................................. 11
3.3 Suitability for the application.................................................................................................. 11
3.4 Environment conditions......................................................................................................... 11
3.5 Check of the installation ........................................................................................................ 12
3.6 Simplified commissioning...................................................................................................... 12
4Product-Overview......................................................................................................................... 13
4.1 What this chapter contains.................................................................................................... 13
4.2 Area of application / Notes on use: ....................................................................................... 13
4.3 Function principle: ................................................................................................................. 13
4.4 Label code............................................................................................................................. 13
4.5 Rating plate............................................................................................................................ 14
4.6 Storage.................................................................................................................................. 15
4.7 Transport and handling.......................................................................................................... 15
5Installation instructions............................................................................................................... 16
5.1 What this chapter contains.................................................................................................... 16
5.2 Mechanical drawings............................................................................................................. 16
5.2.1 Active harmonic filter Z-D-15E-.. ....................................................................................... 16
5.2.2 Active harmonic filter Z-D-35E-.. and Z-D-55E-.. .............................................................. 17
5.2.3 Mechanical installation ...................................................................................................... 18

Operating Instructions Z-D-15/35/55E-..
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5.3 Electrical wiring...................................................................................................................... 19
5.3.1 EMC directive .................................................................................................................... 20
5.3.2 Voltage supply................................................................................................................... 20
5.3.3 LED status display............................................................................................................. 21
5.3.4 Current transformer wiring................................................................................................. 22
5.3.5 Active harmonic filter in parallel wiring .............................................................................. 23
5.3.6 Selection of CT (current transformers).............................................................................. 24
5.3.7 Wiring when using current transformers with high ratio .................................................... 24
5.3.8 EPO and Z-D-15/35/55E-.. ID............................................................................................ 25
5.3.9 Input and output interface.................................................................................................. 26
6Supervision- and control software............................................................................................. 27
6.1 What this chapter contains.................................................................................................... 27
6.2Introduction in the system...................................................................................................... 27
6.2.1 Log In................................................................................................................................. 27
6.2.2 Home ................................................................................................................................. 28
6.2.3 Initialize communication .................................................................................................... 29
6.2.4 System configuration......................................................................................................... 30
6.2.5 Data ................................................................................................................................... 36
6.2.6 Procedure to power on ...................................................................................................... 36
7Maintenance and check of hardware ......................................................................................... 37
7.1 What this chapter contains.................................................................................................... 37
7.2Periodicity of maintenance .................................................................................................... 37
7.3 Disposal/Recycling ................................................................................................................ 38
8Error description and repair........................................................................................................ 39
8.1What this chapter contains.................................................................................................... 39
8.2 Typical errors and repairs...................................................................................................... 39
9Enclosure...................................................................................................................................... 40
9.1 Technical Data....................................................................................................................... 40
9.1.1 Technical Data Active harmonic filter Z-D-15E-.. ............................................................. 41
9.1.2 Technical Data Active harmonic filter Z-D-35E-.. ............................................................. 42
9.1.3 Technical Data Active harmonic filter Z-D-55E-.. ............................................................. 43
9.2 Service information................................................................................................................ 44

Operating Instructions Z-D-15/35/55E-..
General
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1 General
1.1 Manufacturer
The active harmonic filter is a product of ZIEHL-ABEGG SE. The manufacturer is referred to as ZIEHL-
ABEGG in the remainder of these operating instructions.
ZIEHL-ABEGG SE
Heinz-Ziehl-Straße 74653 Künzelsau
phone: [phone]
[e-mail]
http://www.ziehl-abegg.com
Compliance with the following instructions is mandatory to ensure the functionality and safety of the
product. If the following instructions given especially but not limited for general safety, transport, storage,
mounting, operating conditions, start-up, maintenance, repair, cleaning and disposal / recycling are not
observed, the product may not operate safely and may cause a hazard to the life and limb of users and
third parties.
Deviations from the following requirements may therefore lead both to the loss of the statutory material
defect liability rights and to the liability of the buyer for the product that has become unsafe due to the
deviation from the specifications.
1.2 Meaning of the instructions
These instructions instruct you on how to use the specified product safely. They include safety
instructions and information that is necessary for fault-free operation.
•Store the instructions safely on the product for further use. They must be passed on to every
subsequent owner, user or end customer.
•Ensure that all persons performing activities on the product can easily view the instructions at
any time.
1.3 Validity
This instruction applies to:
Active harmonic filter: Z-D-15E-..; Z-D-35E-.., Z-D-55E-..
The used active Harmonic Filter is recognizable from the type designation (see rating plate).
These operating instructions apply only to a specific product and under no circumstances to the
complete system.
The instructions contain information for your guidance. No guarantee is provided with regard to the
accuracy of any information and no legal claims may be derived. Reproduction of this information, or
extracts thereof, is allowed only with written approval.
1.4 Terms and definitions
Filter module
For „Filter module Z-D-15/35/55E-..“ the term „Filter module“ or active harmonic filter will be used.
Drive controller
For the non-linear loads which are used together with the power feedback unit in the following the term
„Controller“ is used
Drive system
For a drive system with harmonic filter, power feedback units, controller and other components of the
drive system in the following the term „Drive system“ is used.

Operating Instructions Z-D-15/35/55E-..
General
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1.5 Intended use
Active harmonic filter are used for reduction of harmonics from for example 6-puls rectifier, frequency
converter or uninterruptible power sources (UPS). Filter are used with further equipment and are
implemented within an electrical system. Active harmonic filter are intended to be installed in an
electrical panel or similar electrical room. Active harmonic filter are not household appliances and may
be considered for commercial use only. Any other use in not allowed.
The manufacturer shall not be liable for any damage resulting from improper use. The user bears the
sole risk.
The intended use also includes:
•Compliance with technical data, application and performance limits according to the data sheet,
order confirmation and other specifications
•Compliance with the prescribed intervals for all inspection work
•Persons performing work completely reading and understanding this documentation and
especially the safety instructions chapter
1.6 Improper use
Any use that is not described in the intended use is improper and therefore impermissible.
The following foreseeable types of misuse are also improper:
•Unauthorized changes to the active harmonic filter
•Operating error
•Improper work on and with the harmonic filter
•Reversing the current direction of the current transformers
Use:
- as a safety component or for performance of safety
related functions as defined in EN ISO 13849- 1
- as an independent household appliance
- in low voltage systems with special fire risks in compliance with IEC 60364-4-42
- in explosive atmosphere
- proximity to flammable substances or objects
- in open operating rooms
Operation:
- use outside the operating data approved in the data sheet, the order confirmation and in
other provided specifications
- in a way that personal injury or material damage may occur in the event of malfunction or
failure
- with a load that leads to higher power consumption and current values than specified on the
rating plate
- with vibrations

Operating Instructions Z-D-15/35/55E-..
Safety precautions
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STOP
2 Safety precautions
2.1 What this chapter contains
Please read this manual carefully and follow all safety precautions before moving, installing, operating
and servicing the active harmonic filter, if ignored, physical injury or death may occur, or damage may
occur to the devices.
If any physical injury, death, or damage to the devices occurs for ignoring to the safety precautions in
the manual, our company will not be responsible for any damages and we are not legally bound in any
manner.
2.2 Safety definitions and warning symbols
All Safety definitions have a uniform layout:
- The pictogram shows the kind of danger
- The signal word characterizes the severeness of danger
- The note describes the danger and suggest how to avoid the danger.
Signal Word
Note
Used Pictogram
Instruction
Warning of
personal
injury
Imminent danger by
electricity
Danger!
Warns of an immediate imminent
danger. In case of disrespect, death or
severe injury may happen.
Warning of an
imminent danger
Warning
Warns of a possible, very dangerous
situation.
In case of disrespect, death or severe
injury may happen.
Dangerous
situation
Caution!
Warns of a possible, dangerous
situation.
In case of disrespect, minor injury may
happen.
Warning of hot
surface
Warning!
Warns of touching of a hot surface.
In case of disrespect, burnings may
happen
Warning of
property
damages
Harmful
situation
Stop!
Warns of possible property damage. In
case of disrespect, the system and it’s
environment may be damaged
Usefull
information and
and hints for
using
Information
Note!
Marks a general, useful hint. If it is
observed, usage of the system will be
easier

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Safety precautions
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Safety and application notes for drive systems
(following Low Voltage Directive 2006/95/EG)
1. General
During operation, filter modules may have, according to theirtype
of protection, live, bare, in some cases also movable or rotating
parts as well as hot surfaces. Non –authorized removal of
required cover, inappropriate use, incorrect installation or
operation, creates the risk of severe injury to persons or damage
to material assets.
Further information can be obtained from the documentation. All
operations concerning transport, installation and commissioning
as well as maintenance must be carried out by qualified, skilled
personnel (IEC 364 and CENELEC HD 384 or DIN VDE 0100
and IEC-Report 664 or DIN VDE 0110 and national regulations
for the preventions of accidents must be observed). According to
this basic safety information qualified skilled personnel are
persons who are familiar with the erection, assembly,
commissioning and operation of the product and who have the
qualifications necessary for their occupation.
2. Application as directed
Filter modules are components which are designed for
installation in electrical systems or machinery.
When installing in machines, commissioning of the filter module
(i.e. the starting of operation as directed) is prohibited until it is
proven, that the machine corresponds to the regulations of the
EC Directive (2006/42/EG) (Machinery Directive); EN 60204
must be observed. Commissioning (i.e. starting operation as
directed) is only allowed when there is compliance with the EMC-
Directive (2004/108/EG).
The filter modules meet the requirements of the Low-Voltage
Directive (2006/95/EEC). The harmonized standards of the prEN
50178/DIN VDE 0160 series together with EN 60439-1/DIN VDE
0660 part 500 and EN 60146/DIN VDE 0558 are applicable for
the power feedback unit. The technical data and information on
the connection conditions must be obtained from the nameplate
and the documentation and must be observed in all cases.
3. Transport, storage
Notes on transport, storage and appropriate handling must be
observed. At non-observance any warranty expires. The filter
module unit has to be protected from inadmissible stress. The
transport is only valid in original packaging and in the thereon
by pictograms marked transport position. In particular during
transport and handling no components are allowed to be bent
and / or isolating distances may not be altered. The modules
are equipped with electrostatic sensitive devices, which may
be damaged by improper handling. Therefore, it has to be
avoided to get in contact with electronic components. If
electronic components are damaged mechanically the module
must not be put into operation, as it cannot be ensured, that all
relevant standards.
This safety information must be kept!
4. Erection
The modules must be erected and cooled according to the
regulations of the corresponding documentation. The filter
modules must be protected from inappropriate loads.
Particularly during transport and handling, components must
not be bent and / or isolating distances must not be changed.
Touching of electronic components and contacts must be
avoided. Filter modules contain electro-statically sensitive
components which can easily be damaged by inappropriate
handling. Electrical components must not be damaged or
destroyed mechanically (health risk are possible!).
5. Electrical Connection
Whenworkingon live filter modules,thevalidnationalregulations
for the prevention of accidents (e.g. VBG 4) must be observed.
Before any installation or connection works, the plant has to be
switched off and to be secured properly.
The electrical installation must be carried out according to the
appropriate regulations (e.g. cable cross-sections, fuses, PE-
connection). More detailed information is included in the
documentation. When using the filter module with controllers
without safe separation from the supply line (to VDE 0100) all
control wiring has to be include in further protective measures
(e.g. double insulated or shielded, grounded and insulated) .
Notes concerning the installation in compliance with EMC –such
as screening, grounding, arrangement of filters and laying of
cables –are included in the chapter installation of this
documentation. These notes must be also observed in all cases
for filter modules with the CE-mark. The compliance with the
required limit values demanded by the EMC legislation is the
responsibility of the manufacturer of the system or machine.
6. Operation
Systems where filter modules are installed, if applicable, have
to be equipped with additional monitoring and protective
devices according to the valid safety regulations e.g. law on
technical tools, regulations forthepreventionof accidents, etc..
After disconnecting the filter module the supply voltage, live
parts of the filter module and power connections must not be
touched immediately, because of possibly charged capacitors.
For this, observe the corresponding labels on the drive
controllers.
During operation, all covers and doors must be closed
7. Maintenance and service
The manufacturer’s documentation must be observed.
The product-specific safety and application
notes in these Operating Instructions must
also be observed!!

Operating Instructions Z-D-15/35/55E-..
Safety precautions
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2.3 General safety information
•These safety regulations are not entitled to completeness. In case of questions please contact
our technicians.
•When commissioning the filter module is compliant with the state of the art. The filter module
generally allows safe operation.
•The statements of this manual describe the attributes of the products without guaranteeing
them.
•The filter module unit may expose persons, the power feedback units itself and other material
to danger, if
- non-qualified personal works at and with the filter module
- the filter module is used in opposite to its purpose.
•Filter modules have to be projected in a way, that they fulfil their function and don’t expose
persons to danger, if they are mounted correctly and are used in accordance with their purpose.
This applies also for the interplay with the whole plant.
•The units, operational data and circuit details described in this manual have to be understood
analogously and have to be checked for transferability to each application.
•Use the drive system only in flawless condition.
•Modifications of the filter modules without consultation of a ZIEHL-ABEGG-technician are not
allowed generally .
•The warranty given by us expires, if the unit is modified or (even partially) dismantled or if it is
used in contradiction to our instructions.
•The constructor of the plant, who has to know the technical guidelines, bears the responsibility
for the correct selection and arrangement of the electrical components.
•Putting into operation of the power feedback unit is only admissible at VDE-conform nets of
electrical power supply. Non observance may damage the device!
•In accordance with the corresponding standards and guidelines the operation on even for a
short time over-compensated networks (cos1) respectively on un-choked compensation-units
is not admissible. If this is done nevertheless, overvoltage will occur (caused by oscillating
currents), which may damage all connected components, especially electronic units like
controllers and filter modules.

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Safety precautions
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STOP
Stop!
Undisturbed and safe operation of the filter module is possible only if the hints of this instruction are
observed.
If they are not observed, in some cases malfunctions and damages may occur:
- Observe specified mains voltage.
- Power and control cables must be installed with distance (> 15cm)
- Use screened / twisted control wires. Connect screen to PE at both ends!
- Ensure good grounding of drive, motor and filter module. Connect the screen of power cables
to ground extensive at both ends.(remove lacquer)!
- Observe star layout for grounding of cabinets and systems (AVOID ground loops!)
- The filter module is designed for fixed mounting and electrical connection.
The ground wire must have a minimum cross section of 2,5mm² (depending of filter module
size).

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Safety precautions
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2.4 Safety responsible persons
Operator
- The operator is any natural or legal person who is using the system or let someone use the
system.
- The operator and / or the safety responsible person must take care for:
- all relevant rules , guidelines and laws must be observed
- only qualified personnel will work with and on the system
- the manual will be available for the personnel during working at the system.
- unqualified personnel will be forbidden to work on the system.
Qualified personal
Stop!
Qualified technical personnel are persons, who - have appropriate training, knowledge and experience
- are informed about relevant specifications, standards and accident prevention regulations
- are trained in the installation and operation of relevant systems
- are able to recognize and avoid possible dangers
(Definition for qualified personnel in accordance to IEC 364)
2.5 Specification of wires and cables
The used wires and cables must comply the relevant standards at place of installation and operation.
Rules regarding minimum PE crass section must be observed in any case!
2.6 Rest danger
Danger!
After switching off the mains supply all terminals may stay life for up to ten minutes!

Operating Instructions Z-D-15/35/55E-..
Fast start
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3 Fast start
3.1 What this chapter contains
This chapter describes the basic guidelines for installation and commissioning of the active harmonic
filter, which should be observed for fast and easy usage.
3.2 First check when unpacking
Please check the goods during and immediately after receipt on the following characteristics:
1
Please check the packaging for intactness and dryness. If this is not the case, immediately
get in contact with the sender.
2
Please check if the type-code on the packaging matches the ordered product. If this is not the
case, immediately get in contact with the sender.
3
Please check for any kind of moisture inside the packaging and for any kind of damages at
the product. If this is not the case, immediately get in contact with the sender.
4
Please check if the type code on the packaging matches the data on the rating plate. If this
is not the case, immediately get in contact with the sender.
5
Please check if the packaging contains all accessories including manual. If this is not the
case, immediately get in contact with the sender.
3.3 Suitability for the application
Please check if all current transformers and the the adjusted parameters asre suitable for the
application before you start up the active harmonic filter for the first time.
3.4 Environment conditions
Please check and consider the following environment conditions before starting the installation:
1
Check for the ambient temperature to be below 40 °C. If it is higher, consider derating of
3%/K. This would mean that a Z-D-55E-.. with rated current 55 A at 45 °C must be loaded
with not more than 46,75 A. Operation above 50 °C is not acceptable.
2
Check for the ambient temperature to be above -10 °C. If it is lower, a heater must be
installed.
Hint: Ambient temperature means the temperature inside the cabinet with the Z-D-15/35/55E-
...
3.
Check for the installation height to be below 1000m above sea level. If it is higher, consider
derating of 1%/100m. This would mean that a Z-D-35E-..with rated current 35 A at 2000mC
must be loaded with not more than 31,5 A. Operation above 4000 m is not acceptable.
4
Check for ambient moisture to be below 90%. If the moisture is higher, measures for
reduction of moisture must be taken.
5
Check for no direct sunlight exposition of the Z-D-15/35/55E-.. and for no dust impact. If that
could happen, countermeasures must be taken.

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Fast start
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3.5 Check of the installation
Perform this check AFTER installation but BEFORE first powering up:
1
Check the correct mounting and wiring of the current transformer (CT). The wired used must
comply with the requirements of components (CT, Z-D-15/35/55E-..) and of place of installation.
3.
Check that power and controls wires are installed separately and that EMC guidelines are
observed.
4
Check the grounding of the system and components for compliance with guidelines and
requirements of the drives.
5
Check if the clearance between the components comply with the requirements of these
instructions.
6
Check if the installation meets the requirements of these instructions. The active harmonic filter
must be mounted in an upright position.
3.6 Simplified commissioning
The active harmonic filter Z-D-15/35/55E-.. is a largely automated product for reduction of harmonics.
Complete the simplified commissioning as described below BEFORE first usage:
1
Check all parameters of the monitoring system on your computer
2
Check the correct wiring of the current transformers
3
If several products are used in parallel, check for compliant adjustment of the parameters.
Hint: If the result of harmonic compensation is not satisfying, please check the parameters once again
first, wiring (especially polarity) of the current transformers second. If everything is o.k., modify the phase
angel of the system to achieve even better results.

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Product-Overview
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4 Product-Overview
4.1 What this chapter contains
This chapter describes the function principle, the characteristics of the product and dimensions.
4.2 Area of application / Notes on use:
The active harmonic filter is intended to reduce harmonics of certain B6 rectifiers or frequency converters
in electrical power supply networks. Its intended to be used for installation in a machine or for assembly
with other components to build a machine. Active harmonic filters are electrical equipment for installation
in control cabinets or similar closed operating rooms. Active harmonic filters are not household
appliances, but are designed as components exclusively for commercial use.
Possible application examples:
- Reduction of harmonics in public and non-public networks
- Reduction of harmonics in industry and business networks
4.3 Function principle:
The following drawings show the principle, simplified setup for active harmonic filters.
Topology of Z-D-15/35/55E-..
4.4 Label code
The type code is part of the rating plate and contains important information about the active harmonic
filter.
Examples for a type code designation with explanation
Z-D-15 E-060
󰪦󰪧󰪨󰪩 󰪪
Nr.
Detaillierte Bezeichnung
󰪦
Designation for product category accessoriesr
󰪧
Designation for 3 phase alternate current
󰪨
Rated current of active harmonic filter = 15 A
󰪩
Designation for assembly device (Protection rating IP20)

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󰪪
Rated current of current transformer = 60 A
4.5 Rating plate
The rating plate carries the technical data valid for the delivered product.
Example for rating plate active harmonic filter
Nr.
Designation
Nr.
Designation
ZIEHL-ABEGG related data
UL related data
1
Part number ZIEHL-ABEGG SE
11
Motor identification UL
2
Series number
12
Rated voltage,
Rated frequency,
Rated current,
3
Rated voltage,
Rated frequency,
Rated current,
13
Max. ambient temperature authorisation
at rated power
4
Max. ambient temperature at rated current
Protection rating
5
Components of part number
Type of active filter
Rated currrent of CT
Series number of coresponding CT
6
Date of manufacture
7
Type designation of active harmonic filter
including the coresponding CT
8
Weight
9
Barcode part number
10
European mark of conformity
6
7
8
9
1
2
3
4
5
10
11
12
13

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4.6 Storage
Store correctly:
•Store the product in the original packaging in a dry and weatherproof location and protect it from
dirt and weather until final installation.
•Make sure the environment is dry, vibration-free and condensation-free. Prevent formation of
condensation inside the product and packaging.
•Avoid extreme stresses due to heat, cold or moisture (see technical data for the temperature
range for storage and transport). Recommended values: Temperature 0 °C to 40 °C, max.
relative humidity 60 %.
4.7 Transport and handling
Improper transport can cause damage to the product and its accessories, which shortens the product
service life and/or impair its function.
Transport correctly:
•Transport active harmonic filter in the original packaging.
•Only transport if protected against weather; unprotected transport is not allowed. Moisture
penetration into the packaging is not allowed.
•Avoid impacts and bumps during transport and observe the limit values from ISTA 3E and ISTA
3B.
•When transporting a device with an installed active harmonic filter, do not exceed the limit values
stipulated in EN 60721-3-2, Category 2M1 for vibrations and impacts.

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Installation instructions
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5 Installation instructions
5.1 What this chapter contains
This chapter describes mechanical and electrical installation.
5.2 Mechanical drawings
5.2.1 Active harmonic filter Z-D-15E-..

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5.2.2 Active harmonic filter Z-D-35E-.. and Z-D-55E-..

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Installation instructions
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5.2.3 Mechanical installation
For safe and undisturbed operation, it is mandatory to follow those instructions for mechanical
installation:
1. Clearance between active harmonic filter and other components like chokes, cabinet walls,
drives:
- ≥100 mm in horizontal direction (left/right) and
- ≥100 mm in vertical direction (bottom)
2. Clearance between several active harmonic filter:
- ≥100 mm in horizontaldirection (left/right)
- ≥100 mm in vertical direction (bottom)
3. Min. clearance in vertical direction (top):
- Z-D-15E-..: 130 mm
- Z-D-35E-..: 180 mm
- Z-D-55E-..: 180 mm
4. Use screws with min. diameters
- Z-D-15E-..: 6 mm
- Z-D-35E-..: 6 mm
- Z-D-55E-..: 6 mm

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5.3 Electrical wiring
Active harmonic filters may only be installed, commissioned and serviced by certified electrician.
Connect the active harmonic filter according to the attached connection diagram. The labeling
is in the immediate vicinity of the connection terminals.
3 Wire 3 Phase
Note: For part numbers 349110, 349111, 349112, the conductor of the load current must be passed
through the converter two times (loop once) to achieve the correct current transformer rating. It is
essential (as with simple implementation) that the direction of energy flow in the conductor and the
direction of the arrow on the converter match.
Exemplary illustration:
One times passage of the conductor
Two times passage of the conductor
Part number: 349114, 349115, 349116,
349117, 349118, 349119, 349120, 349121
Part number: 349110, 349111, 349112

Operating Instructions Z-D-15/35/55E-..
Installation instructions
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L-BAL-E321-GB 2021/11 Index 002 20/44
5.3.1 EMC directive
Compliance with the EMC directive is only given if the active harmonic filter is connected directly to the
main power supply.
If the active harmonic filter is built into a system or combined with other products, the manufacturer of
the system / operator of the device is responsible for compliance with the EMC directive according to
the locally applicable standards.
5.3.2 Voltage supply
The voltage supply must match the information on the rating plate (see technical data).
The voltage supply must comply with the EN 50160 quality characteristics and the defined standard
voltages of IEC 60038!
Remarks for connection of CT (current transformer):
Routing of wires: The wires between the active harmonic filter and current transformers must be
twisted pair cables. A correct function is only possible if the wiring matches exact the diagram below. If
wires are interchanged, the harmonics will not be reduced but amplified. To avoid interchanging of wires
it is strongly recommended not to use any wire colour twice.
Wire cross section: The cross section of the wires has a significant influence on the quality of the
control. Is the cross section to small in relation to the length of the wire, the resulting measurement
within the active harmonic filter will be too small to achieve a good control quality and good reduction of
harmonics.
  

The following values needed to be known:
- S = Power of the current transformer (30 A - 80 A typical 1.5 VA, ≥100 A typical 2.5 VA )
- d = Distance (length of cableway) between active harmonic filter and current transformer
- v = Twisting factor (typical 1,5)
- I = secondary current of the current transformer ( typical 5 A)
- ρ = Rho = specific resistance of copper (  
)
- Example:   
 
Wiring type: At 3W3P (installation of two current transformers) the neutral must not be connected to
the active harmonic filter. It is mandatory that the physical installation must match the adjusted method
in the software of the active harmonic filter. If this is not observed, the reduction of harmonics is not
optimal.