REVCON SVCD(S) User manual

ELTROPLAN-REVCON
Elektrotechnische Anlagen GmbH
Operating instructions
Power feedback unit REVCON

SVCD(S)
Power range 7 ... 250 kW
Voltage range 230V, 400V, 460V,
500V, 690V
V 3.2 Issue 11/09

Contents
Operating instructions SVCD(S) 1
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
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1
1 1 Preface and general information .................................................................................. 3 1
1.1 1 About these Operating Instructions ............................................................................. 3 1
1.1.1 1 Terminology used ........................................................................................................ 3 1
1.1.2 1 Ordering code............................................................................................................... 4 1
1.2 1 Scope of delivery ......................................................................................................... 4 1
1.3 1 Legal regulations.......................................................................................................... 5 1
1.4 1 EC-Directives / Declaration of conformity.................................................................. 6 1
1.4.1 1 What is the purpose of EC-Directives?........................................................................ 6 1
1.4.2 1 What is the meaning of the CE-mark? ......................................................................... 6 1
1.4.3 1 EC-Low-Voltage Directive.......................................................................................... 6 1
1.4.4 1 EC-directive Electromagnetic compatibility................................................................ 7 1
1.4.5 1 EC-Directive Machinery.............................................................................................. 8 1
2 1 Safety information ....................................................................................................... 9 1
2.1 1 General safety information......................................................................................... 10 1
2.2 1 Safety-responsible persons......................................................................................... 14 1
2.3 1 Layout of the safety information................................................................................ 15 1
2.4 1 Residual hazards ........................................................................................................ 16 1
2.5 1 General instructions ................................................................................................... 16 1
3 1 Technical data ............................................................................................................ 27 1
3.1 1 Characteristics............................................................................................................ 27 1
3.2 1 General data / application conditions......................................................................... 27 1
3.3 1 Rated data................................................................................................................... 28 1
3.3.1 1 Power feedback unit................................................................................................... 28 1
3.3.2 1 Current load ............................................................................................................... 29 1
3.3.3 1 Fuses and wire cross sections .................................................................................... 32 1
3.3.4 1 Series fuses................................................................................................................. 32 1
3.3.5 1 Internal fuses.............................................................................................................. 34 1
3.3.6 1 RFI-filter .................................................................................................................... 36 1
3.3.7 1 SKS-module............................................................................................................... 38 1
4 1 Installation.................................................................................................................. 40 1
4.1 1 Mechanical installation ............................................................................................. 40 1
4.1.1 1 Important hints .......................................................................................................... 40 1
4.2 1 Dimensions ................................................................................................................ 41 1

Contents
2 Operating instructions SVCD(S)
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4.2.1 1 Power feedback unit................................................................................................... 41 1
4.2.2 1 RFI-filters................................................................................................................... 45 1
4.2.3 1 SKS modules.............................................................................................................. 48 1
4.3 1 Electrical installation ................................................................................................. 52 1
4.3.1 1 Operator’s safety........................................................................................................ 52 1
4.3.2 1 Protection of the power feedback unit ....................................................................... 52 1
4.3.3 1 Mains types / Mains characteristics ........................................................................... 53 1
4.3.4 1 Specifications of the used wires................................................................................. 53 1
4.4 1 Connection ................................................................................................................. 54 1
4.4.1 1 Power connection....................................................................................................... 54 1
4.4.1.1 1 Wiring schematic ....................................................................................................... 56 1
4.4.2 1 Fan supply.................................................................................................................. 58 1
4.4.3 1 Control wires.............................................................................................................. 58 1
4.4.4 1 Control functions ....................................................................................................... 58 1
4.5 1 Application example .................................................................................................. 62 1
4.6 1 Installation of a power feedback unit in a CE-typical drive system .......................... 63 1
4.6.1 1 Installation.................................................................................................................. 64 1
4.6.2 1 Connection of a RFI-filter.......................................................................................... 65 1
4.6.3 1 Design of an EMC-conformal cabinet ....................................................................... 66 1
4.6.4 1 Remarks ..................................................................................................................... 67 1
4.6.5 1 Installation of control wires ....................................................................................... 68 1
5 1 Commissioning .......................................................................................................... 69 1
5.1 1 First powering up ....................................................................................................... 69 1
6 1 Configuration ............................................................................................................. 70 1
7 1 Troubleshooting and fault elimination....................................................................... 73 1
7.1 1 LED-messages ........................................................................................................... 74 1
8 1 Service........................................................................................................................ 76 1
9 1 Appendix.................................................................................................................... 77 1
9.1 1 Options....................................................................................................................... 77 1
9.2 1 REVCON
®
Product overview.................................................................................... 79 1
9.3 1 Contact ....................................................................................................................... 80 1

Preface and general information
Operating instructions SVCD(S) 3
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1Preface and general information
1.1 About these Operating Instructions
•These Operating Instructions help you to work properly on and with the power feed-
back units REVCON

SVCD(S). They contain safety information which must be ob-
served and information which are necessary for an undisturbed operation of the units
together with the exploitation of all the advantages of the system.
•All persons who work on and with the power feedback units REVCON

SVCD(S)
must have the Operation instructions available and observe all relevant notes and in-
struction.
•The Operating Instructions must always be in a complete and perfectly readable state.
1.1.1 Terminology used
Power feedback unit
For „Power feedback unit REVCON

SVCD(S)“ in the following the term „Power
feedback unit“ is used.
Controller
For the frequency inverter which is used together with the power feedback unit in the
following the term „Controller“ is used.
Drive system
For a drive system with power feedback units, controller and other components of the
drive system in the following the term „Drive system“ is used.

Preface and general information
4 Operating instructions SVCD(S)
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1.1.2 Ordering code
SVCD(S) 30 - XXX - 1 - 230
Auxiliary voltage e. g. 230V
1=Forced ventilation, natural convection
Mains voltage e. g. 400 (3 x 400V AC)
max. feedback power e. g.30 (30 kW)
incl. Option SKS
SVCD = Power feedback unit
for 100% duty cycle
1.2 Scope of delivery
•1 Power feedback unit REVCON

SVCD(S)
•1 Operating Instructions
After receipt of delivery, check immediately whether the scope of supply matches
with the accompanying papers. We do not accept any liability for deficiencies
claimed subsequently.
Claim
•Visible transport damage immediately to the forwarder.
•Visible deficiencies/incompleteness immediately to ELTROPLAN-REVCON.

Preface and general information
Operating instructions SVCD(S) 5
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1.3 Legal regulations
Labelling Nameplate CE-mark Manufacturer
Power feedback units REVCON

SVCD(S) are unequivocally marked by
the contents of the nameplate.
Conforms the EC Low
Voltage Directive
ELTROPLAN-
REVCON
Edisonstraße 3
D-59199 Bönen
Patent rights The power feedback unit REVCON



SVCD(S) is protected in Germany and Europe by patents:
Patent-No.: DE 3938654C1 and Patent-Nr.: 90123584.6-2207.
Patent infringements become prosecute.
Application
as directed
Power feedback unit REVCON



SVCD(S)
•Must only be operated under the conditions prescribed in these instructions.
•Are components
–to feedback electrical energy
–used for installation into a machine
–used for assembly together with other components to from a machine
•Are electric units for the installation into control cabinets or similar enclosed operating hous-
ing.
•Comply with the requirements of he Low-Voltage Directive
•Are not machines for the purpose of the Machinery Directive
•Are not to be used as domestic appliances, but only for industrial purpose.
Drive systems with power feedback unit REVCON



SVCD(S)
•Comply with the EMC-Directive if they are installed according to the guidelines of CE-typical
drive systems.
•Can be used
–on public and non-public mains
–in industrial as well as residential and commercial premises
•The user is responsible for the compliance of this application with the EC directives.
Liability
•
The information, data and notes in these Operating Instructions met the state of the art at the
time of printing. Claims referring to power feedback units which have already been supplied
cannot be derived from information, illustrations and descriptions given in these Operation In-
structions.
•The specifications, processes and circuitry described in these Operating Instructions are for
guidance only and must be adapted to your own specific application. ELTROPLAN-
REVCON does not take responsibility for the suitability of the process and circuit proposals.
•The indications given in these Operating Instructions describe the features of the product
without warranting them.
•ELTROPLAN-REVCON does not accept any liability for damage and operating interference
caused by:
–disregarding these instructions
–unauthorized modifications to the power feedback unit
–operating errors
–improper working on and with the power feedback unit
Warranty
•
Warranty conditions: see sales and delivery conditions of ELTROPLAN-REVCON GmbH.
•Warranty claims must be made immediately after detecting defects or faults.
•The warranty is void in all cases where liability claims cannot be made.
Disposal Material recycle disposal
Metal 1-
Plastic 1-
Printed-board assemblies - 1

Preface and general information
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1.4 EC-Directives / Declaration of conformity
1.4.1 What is the purpose of EC-Directives?
The EC-Directives have been drawn up by the European council to define common tech-
nical standards and certification procedures within the European Community. At the
moment there are 21 EC-Directives for product sectors. The directives are or will be con-
verted in national laws by the member states. If a certificate is conferred in one member
state, it is valid in all other member states automatically.
The directives only describe the basic standards. The technical details are or will be de-
scribed in harmonized European standards.
1.4.2 What is the meaning of the CE-mark?
After a conformity-assessment-procedure, the conformity with the standards of the EC-
Directives is certified by fixing the CE-marking. Within the EC there are no trading ob-
stacles for a CE-marked product.
Power feedback units with CE-mark themselves are compliant with the Low-Voltage
Directive only. For observing the EMC Directive recommendations are made.
1.4.3 EC-Low-Voltage Directive
(73/23/EEC)
Modified by: CE – Marking Directive (93/68/EEC)
CE – Marking Directive (2006/95/EEC)
General:
•The Low-Voltage Directive is valid for all electrical equipment which is used at a
nominal voltage between 50V and 1000V AC and between 75V and 1500V DC to-
gether with customary environment conditions. Excluded is e.g. the use of electrical
equipment in explosive areas and electrical components of lifts for persons or mate-
rial.
•Aim of the Low-Voltage Directive is to put only those products into commerce
which don’t endanger the safety of persons and animals as well as the preservation of
material assets.

Preface and general information
Operating instructions SVCD(S) 7
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EC-declaration of conformity
According to the EC-Low Voltage Directive (2006/95/EEC)
The power feedback units REVCON

SVCD(S) have been developed, designed and manu-
factured in accordance with the above mentioned EC-Directive and in sole responsibility of
ELTROPLAN-REVCON Elektrotechnische Anlagen GmbH,
Edisonstraße 3, D-59199 Bönen
Considered standards:
Standard
DIN VDE 0160 5.88 +A1 / 4.89 +A2 / 10.88
PRDIN EN 50178
Class VDE 0160 / 11.94
Equipment of power installations with
electronic components
EN 61558-1/A1 Safety of power transformers, power
supplies, reactors and similar products
EN 60529 International protection rating
DIN EN 61000-6-3:2007 part 6.3 /
IEC 61000-6-3:2006
Generic standards – Emission standard
for residential, commercial, and light-
industrial environments
DIN EN 61000-6-4:2007 part 6.4 /
IEC 61000-6-4:2006
Generic standard for industrial envi-
ronments
1.4.4 EC-directive Electromagnetic compatibility
EMC directive (89/336/EWG)
Replaced by: EMC-directive (2004/108/EG)
General:
The objective target describes article 4 (2004/108/EG), as follows:
The... designated devices must be so manufactured, that
(a) an intended operation of radio- and telecommunication devices and other devices is
possible and
(b) the devices have an adequate stability against electromagnetically disturbances, so
that an intended operation is possible.

Preface and general information
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EG-declaration by the manufacturer
in terms of the EG-standard EMC (2004/108/EG)
The listed REVCON

products are in terms of the EMC no independently recoverable
products, this means only after integration in the overall system would they be rateable
regarding to EMC. The rating became detected for typical plant constructions, but not for
the several products.
ELTROPLAN- REVCON Elektrotechnische Anlagen GmbH,
Edisonstraße 3, D-59199 Bönen
1.4.5 EC-Directive Machinery
Machine directive (98/37/EG)
Changed by: Modification directive (2006/42/EG)
General:
Machinery means an assembly, fitted with or intended to be fitted with a drive system other
than directly applied human or animal effort, consisting of linked parts or components, at
least one of which moves, and which are joined together for a specific application.
EG- declaration by the manufacturer
in terms of the EG-directive machines (2006/42/EG)
The Energy feedback units REVCON

SVCD(S) were developed, designed and manufac-
tured in accordance to the above named EG- directive in exclusive accountability by
ELTROPLAN-REVCON Elektrotechnische Anlagen GmbH,
Edisonstraße 3, D-59199 Bönen
The operation of the filter module REVCON

SVCD(S) is prohibited as long as it is de-
termined, that the machine, in which it should be installed, conforms to the regulations of
the EG-directive machines.

Safety information
Operating instructions SVCD(S) 9
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2Safety information
Safety and application notes
for frequency converters
(Low-Voltage Directive (2006/95/EEC)
1. General
During operation, power feedback unit may have, according to their
type 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, incor-
rect installation or operation, creates the risk of severe injury to per-
sons 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 person-
nel (IEC 364 and CENELEC HD 384 or DIN VDE 0100 and IEC-
Report 664 or DIN VDE 0110 and national regulations for the preven-
tions of accidents must be observed).
According to this basic safety information qualified skilled personnel
are persons who are familiar with the erection, assembly, commission-
ing and operation of the product and who have the qualifications nec-
essary for their occupation .
2. Application as directed
Power feedback units are components which are designed for installa-
tion in electrical systems or machinery.
When installing in machines, commissioning of the power feedback
unit (i.e. the starting of operation as directed) is prohibited until it is
proven, that the machine corresponds to the regulations of the EC Di-
rective (2006/42/EG) (Machinery Directive); EN 60204 must be ob-
served.
Commissioning (i.e. starting operation as directed) is only allowed
when there is compliance with the EMC-Directive (2004/108/EG).
The power feedback units 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 con-
nection 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
The power feedback unit has to protected from inadmissible stress. In
particular during transport and handling no components are allowed to
be bend and / or isolating distances may not be altered. The units are
equipped with electrostatic sensitive devices, which may be damaged
by improper handling. Therefore it has to be avoid to get in contact
with electronic components. If electronic components are damaged
mechanically the unit must not be put into operation, as it cannot be
ensured, that all relevant standards are observed. Climatic conditions
must be observed according to prEN 50178
4. Erection
The devices must be erected and cooled according to the regula-
tions of the corresponding documentation.
The power feedback units 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.
Power feedback units contain electro-statically sensitive compo-
nents which can easily be damaged by inappropriate handling.
Electrical components must not be damaged or destroyed me-
chanically (health risk are possible!).
5. Electrical Connection
When working on live power feedback units, the valid national
regulations for the prevention of accidents (e.g. VBG 4) must be
observed. Before any installation or connection works, the pant
has to be switched off and to be secured properly.
The electrical installation must be carried out according to the ap-
propriate regulations (e.g. cable cross-sections, fuses, PE-
connection). More detailed information is included in the docu-
mentation. When using the power feedback unit 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 ca-
bles – are included in the chapter installation of this documenta-
tion. These notes must be also observed in all cases for power
feedback units with the CE-mark. The compliance with the re-
quired limit values demanded by the EMC legislation is the re-
sponsibility of the manufacturer of the system or machine.
6. Operation
Systems where power feedback units are installed, if applicable,
have to be equipped with additional monitoring and protective
devices according to the valid safety regulations e.g. law on tech-
nical tools, regulations for the prevention of accidents, etc. .
After disconnecting the power feedback unit from the supply
voltage, live parts of the power feedback unit and power connec-
tions 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.
This safety information must be kept!
The product-specific safety and application notes in these Operat-
ing Instructions must also be observed!

Safety information
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2.1 General safety information
•These safety regulations are not entitled to completeness. In case of questions
please contact our technicians.
•When commissioning the power feedback units are compliant with the state of the
art. The power feedback unit generally allows safe operation.
•The statements of this manual describe the attributes of the products without guar-
anteeing them.
•The power feedback unit may expose persons, the power feedback units itself and
other material to danger, if
– not qualified personal works at and with the power feedback unit
– the power feedback units are used in opposite to its purpose.
•Power feedback units 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 applica-
tion.
•For the reasons of personal safety, the observance of the EMC-regulations and for
the regular cooling the operation of the device is only allowed with a closed cover
of the housing and with mounted flanges!
•
•Use the drive system only in flawless condition.
•Modifications of the power feedback units without consultation of a REVCON

-
technician are not allowed generally.

Safety information
Operating instructions SVCD(S) 11
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•The warranty given by us expires, if the unit is modified or (even partially) disman-
tled or if it is used in contradiction to our instructions.
•The constructor of the plant, who has to know the technical guidelines, bears the re-
sponsibility 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 (cosϕ≤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 power feedback units.
•To low powered or unloaded generators and to regulating transformers it is never al-
lowed to feed back power without a previous consultation of our application depart-
ment. Otherwise unintended voltage rises / excess voltages are generated, which may
damage or destroy REVCON

and combined units!
•Before operating at nets without reference to neutral ground additional safety meas-
ures (e.g. installation of over voltage suppressors like MOV’s) have to be done. If
necessary, please ask for technical support by our technicians.
•An undisturbed operation of the power feedback unit is only probable, if the follow-
ing instructions are observed. If these instructions are not observed, tripping of the
unit and damages may occur.

Safety information
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•Pay attention to the correct values of mains and DC-bus voltage.
•Separate power and control wires (> 15cm)
•Use shielded or twisted control wires. Connect both ends of the shield to
ground!
•When using the digital input devices, only use suitable switching devices,
whose contacts are able to switch the connected voltages.
•Connect the housings of drive, controller and power feedback unit to ground
carefully. Connect shields of power cables to ground at both ends with as
big surface as possible (remove lacquer)!
•Connect the cabinet or the plant by a star-shaped network to ground (ground
loops have to be avoided!)
•The power feedback unit has been designed for a fixed connection to mains
only. Especially when using RFI-filter leakage current values> 3,5mA may oc-
cur. The cross section of the earthing conductor must be al least 10mm² copper,
or a second conductor has to be connected in parallel (star shaped grounding
network).
•If components are used, which have no electrical separated inputs / outputs it is
necessary to equalize the potentials (e.g. by a equalizing wire). If this is not ob-
served, these components may be damaged by equalizing currents.
•When carrying out an insulations test in accordance with VDE0100/part 620
the device has to be disconnected to avoid damage to the power semiconduc-
tors. This procedure corresponds with the standard, as each device performs a
high voltage test in accordance with VDE 0160 (EN 50178) in the course of fi-
nal testing after manufacturing.

Safety information
Operating instructions SVCD(S) 13
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•A standard fault-current circuit breaker (sensitive on peak currents) is not allowed to
be used as the only protective measure when using controller and power feedback
unit Caused by a DC-component in the mains current a controller with 3-phase input
voltage may prevent a fault-current circuit breaker from tripping in case of a earth
fault. In accordance with VDE 0160 a fault-current circuit breaker is not allowed to
be used as the only protective measure. In dependence on the kind of network (TN,
IT, TT) further protective measures in accordance with VDE 0100 part 410 are nec-
essary. For a TN-network this may be an over current protection, for an IT-network a
insulation supervision with pulscode-measurment. For all kind of networks protec-
tive insulation (-transformer) may be used, if required power and length of wires al-
low that. When selecting a fault current circuit breaker the following measures have
to be considered:
•The fault current circuit breaker has to be compliant with the VDE 0664 standard.
•The tripping current should be 300mA or more, to prevent a premature tripping
caused by the leakage current of the controller. In dependence on the load, the
length of the motor cables and the usage of a RFI-filter the leakage current may
even be much higher.
Fault current circuit breakers, which are sensitive to all kinds of leakage currents, grant a
good protection and are suitable as the only protection measurement for one ore three
phase controllers. The connection instructions of the manufacturer have to be observed.

Safety information
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2.2 Safety-responsible persons
User
•User is any natural or legal entity, who uses the drive system or by whom order
the drive system is used.
•The user respectively his security officer have to grant
– that all relevant regulations, instructions and laws have to be observed
– that only qualified personnel works with or at he drive system
– that the relevant manual is available for the personnel during any works
– that non-qualified personnel is prohibited to work on the drive system
Qualified staff
Stop!
Qualified personnel are persons who are, based on their education, experience, instruction and
knowledge about standards and guidelines, regulations for the prevention of accidents and the
situation in the plant, authorized by the safety officer of the plant to execute the necessary
works and are able to recognize possible dangers and to avoid them.
(Definition of qualified personnel in accordance with IEC 364)
Usage as directed
Power feedback units are electrical drive components, which are directed to be installed in elec-
trical plants or machines. They have to be used only for drive systems with infinity variable
speed controls of 3-phase asynchronous or permanent magnet motors. The usage with other
electrical loads is not permitted and may damage the devices. The power feedback unit may
only be connected to symmetrical networks. Non-observance may damage the devices.
STOP

Operating instructions
S
123
2.3
Layout of the s
•
All safety no
-
The icon c
-
The signa
-
The note d
Signal word
Legend
Used pictogra
Warning of
injury to
persons
Imm
by c
War
mine
Dan
situa
War
surfa
Warning of
property dam-
ages
Harm
situa
Useful informa-
tion and appli-
cation notes
Info
STOP
Safe
SVCD(S)
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e safety information
notes have a uniform layout:
n characterizes the type of danger.
nal word characterizes the severity of danger.
te describes the danger and suggests how to avo
rams
Signal words
minent danger
current
Danger!
Warns of an immediat
Consequences by disre
Death or severe injurie
arning
of a im-
inent danger
Warning!
Warns of a possible, ve
situation. Possible con
gard:
Death or severe injurie
angerous
tuation
Caution!
Warns of a possible, da
Possible consequences
Minor
or small injuries
arning of hot
rface
Warning!
Warns of touching a ho
Possible consequences
Burnings
armful
tuation
Stop!
Warns of possible prop
Possible consequences
Damage of the drive s
ings
formation
Note!
Marks a generally, use
If you follow it, you m
handling of the system
fety
information
15
void the danger.
iately imminent Danger.
sregard:
ries
, very danger
onsequences by disr
e-
ries
, dangerous situation.
es by disregard:
ies
hot surface.
es by disregard:
roperty damages.
es by disregard:
e system or its surroun
d-
seful note, tip.
make the
m easier

Safety information
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2.4 Residual hazards
Operator’s safety
After mains disconnections, the power terminals + and – remain live for several minutes.
Protection of the device
Cyclic connection and disconnection of the supply voltage at terminals L1, L2 und L3, may
overload the internal input current limitation:
Allow at least 1 minute between disconnection and reconnection.
2.5 General instructions
By this information to erectors and users of a plant hints on properties and
directions concerning the power feedback unit are given. These hints are not entitled to
completeness.
Special features in comparison towards a chopper
Unlike a braking resistor a power feedback device isn't a constant sink, but it's dependent
on the momentary characteristics of the supplying net. Commutation brake downs and
voltage-flicker in the net have a considerable effect to the backward current of the device.
In case of a short time voltage brake down the backward current has to rise correspond-
ingly to feedback the demanded power-amount. If the level of the supply voltage sinks
for a longer time, the maximum feedback power is reduced.
If only one phase fails, the device is able to work on, but the current in the two remaining
conductors will rise up to 150% of the normal level.
STOP

Safety information
Operating instructions SVCD(S) 17
123456278 - 419A58

Elektrotechnische Anlagen GmbH
1
Length of the DC-connection
The maximum inductivity of the DC-connection between output B6 Bridge of the in-
verter and the power feedback device mustn't exceed a certain level, as this inductivity
inducts an additional voltage to the DC-bus, when the IGBT’s are switched off. To
avoid an overload to the components of the power feedback unit, this additional voltage
must not exceed 100V. Resulting from this and other relevant characteristics of the
power feedback unit (DC-capacity and absolute maximum value of the grid current) the
maximum inductivity
(
)
2
2
max
ˆ
i
UC
L
GL
∆⋅
=
can be calculated.
The maximum valid line inductance for the feedback unit and the coupling inductance
between the two DC lines
(
)
25,0ln
0
/
+=
⋅µ
−+ r
a
l
L
π
follows at a by the ampacity specified
cross section of the conductor a maximum length of the connecting cable.
This inductivity always has to be higher or equal than the sum of the DC-bus inductivity
of the frequency inverter and the conductor inductivity of the DC connection.
The DC-bus inductivity of the frequency inverter has only to be considered, if it is
placed between the inverter B6 bridge and the power feed-back unit. The cables, which
are normally used for power applications, have an inductance per unit length of about
0,6µH/m.
If the values of the input capacitance C, the during power feed back maximum allowed
rise of the DC-voltage ∆U
GL
=100V, the top level of the AC-current of the device (
i
ˆ
=2*I
eff
),, the inductance per unit length L´
(
)
25,0ln´
0
+=
µ
r
a
L
π
and the inductance of the
DC-bus ´choke L
ZKD
are known the maximum longitude of the conductors can be calcu-
lated with the following equation:
L
L
Li
UC
l
ZKD
GL
′
−
′
⋅
∆⋅
=
2
2
max
ˆ

Safety information
18 Operating instructions SVCD(S)
123456278 - 419A58

Elektrotechnische Anlagen GmbH
1
Typical capacitance of the DC-connection inside the power feedback unit:
REVCON
®
-type Power
[kW]
DC-capacity
[µF]
SVCD(S) 400V 7 20
SVCD(S) 400V 13 20
SVCD(S) 400V 18 100
SVCD(S) 400V 24 40
SVCD(S) 400V 30 40
SVCD(S) 400V 50 220
SVCD(S) 400V 70 220
SVCD(S) 400V 100 660
SVCD(S) 400V 125 440
SVCD(S) 400V 150 660
SVCD(S) 400V 200 660
SVCD(S) 400V 250 880
Table 2.6.1
Example:
C=200µF, ∆U
GL
=100V, i=271A, a=80mm, r=8,5mm, µ
0
=1,257
.
10
-6
H/m 1l
max
=26m
For longer DC-Bus-wires additional capacitors have to be installed (please get in con-
tact with our application-department if the occasion arises).

Safety information
Operating instructions SVCD(S) 19
123456278 - 419A58

Elektrotechnische Anlagen GmbH
1
Operation on a generator
The usage of a power feedback unit within an island network (e.g. with a diesel genera-
tor) is possible, but there are restrictive regulations concerning the power limits.
M
M
REVCON
R
0,4kV
100kVA
20kW
20kW
G
FC
Figure 2.6.1
Within a network that is assembled like in figure 2.6.1 there are two additional restric-
tions: First the power of the motor connected to the inverter must be lower than half of
the nominal power of the generator. Second the total amount of the power of the two
other loads must be more than double of the feed back power.
If these conditions aren't checked up a change from motor to generator operation may
result in load shocks. These shocks are too dynamic for the voltage regulator of the gen-
erator. The regulator reacts with an overshoot and as a result of this with an over voltage
within the island network.
Danger!
Over voltages may cause serious damages to the connected frequency inverter and /or to the
power feedback unit and to the other loads.