Schaffner FN 6840-25-113-E0XXR Operating manual

Schaffner Group |Nordstrasse 11 |4542 Luterbach |Switzerland
T [phone] |F+41 32 681 66 30 |www.schaffner.com
User and Installation Manual
LCL filter
LCL filter FN 6840 Standard LCL Filter
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User and Installation Manual
LCL Filter
May 2018
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© All rights reserved.
No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or
by any means without the prior written permission of Schaffner International Ltd. The information in this
manual is subject to change without notice. Every precaution has been taken in the preparation of this
manual. Schaffner assumes no responsibility for errors or omissions. Neither is any liability assumed for
damages resulting from the use of the information contained in this publication.
Initial version 01 (May 2018)
The most current edition of these instructions (PDF format) can be obtained from www.schaffner.com or
from your local Schaffner sales representative.
Other technical documentation of our products is also available in the download area of
www.schaffner.com
Document name:
User and Installation Manual LCL Filter Rev01.pdf
Version history
Revision
Date
Description
01
July 2018
Initial version
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i. LCL filter
Product characteristics and field of application
The LCL family FN6840 have been designed for AFE (Active Front End) drives. In addition, the LCL filter
can also be applied in combination with other AIC (Active Infeed Converter) application in case the
specification does fit to their requirements.
An LCL filter belongs as a functional part to the AFE or AIC. As a functional part it provides an
impedance between grid and drive, which is necessary to connect the AFE to the grid and to control the
input current. Depending on the grid impedance and drive settings, the LCL filter can limit the ripple
current generated by the AFE/AIC to a level of <5%.
The ready to be connected compact enclosed filter includes all the necessary LCL components in one
package.
The standard FN 6840 LCL filter series from Schaffner has the following key features:
ICurrent and voltage range of 25 A … 380 A @ 50°C, up to 480 VAC 50/60Hz
IVersions with or without resonance damping
IVersions without cooling fan and without power supply (up to 250A)
IVersions with cooling fan and with power supply (380A only)
IVersions in IP 00
ICustom specific adaptations to fulfil dedicated requirements
Typical examples of regenerative motor drives applications:
IElevator, hoists and cranes, transportation systems
IMachine tools, machines with frequent breaking cycles
ICentrifuges, flywheels (when switched off )
IWinder / Unwinder, rolling mills run-out tables
IPress feeders
ITest stands
Typical examples of other AIC applications:
IRenewable energy, e.g. Windgenerator or Photovoltaic inverter
IEnergy storage or battery charging systems
To fulfill customized application requirements please contact our local sales and support organization.
The LCL filter from Schaffner can be configured in different ways (with/without resonance damping,
with/without cooling fan).
This user manual is intended to support designers, installers, and application engineers with filter
selection, installation, application, and maintenance.
For additional support, please feel free to contact your local Schaffner sales and support organization.
ii. Important user notice
Schaffner LCL filters are designed for the operation on the input (grid) side of power electronic
equipment with AFE (Active Front End) or AIC (Active Infeed Converter) in balanced three-phase power
systems, like typically used for AC motor drives and other converter systems. Filter suitability for a given
application must be determined by the user on a case by case basis. Schaffner will not assume liability
for any consequential downtimes or damages resulting from the use of LCL filters outside of their
specifications.
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iii. General Safety Notes and Installation Guidelines (Cautions and Warnings)
Schaffner LCL filters delivery package contains the following important “General Safety Notes and
Installation Guidelines” which needs to be carefully read and understood before the product is being
installed.
Please contact your local Schaffner sales and support organisation in case the document is not
contained within the delivery.
General safety notes and installation guidelines (Cautions and Warnings)
1. Important information
These general safety notes refer to the group of LCL filters. Do not attempt to install, operate, maintain
or inspect LCL filters until you have read through the safety notes and installation guidelines as well as
installation manual and product specification. Do not use any Schaffner products until you have a full
knowledge of the equipment, safety notes and installation guidelines. The same applies to all warnings
placed on the filters. Please ensure that those are not removed and their legibility is not influenced by
external factors.
The following symbols, terms and designations are used in these general safety notes and installation
guidelines:
Label
Description
Follow these instructions to avoid ha
zardous conditions which could cause
minor or moderate injury or may cause damages to the unit.
Follow these instructions to avoid hazardous conditions which could result
in death or serious injury.
Indicates content to be noted by the user.
2. General installation notes
|Please read and follow the safety and application notes below.
|Carefully inspect the shipping container and the product prior to the installation. In case of visual
damage, don’t install the filter and file a claim with the freight carrier involved.
|Filters may be heavy. Follow the instructions for lifting heavy equipment defined by your
company.
|Use an appropriately sized threaded bolt for every mounting hole/slot provided by the filter
flange. The strength class of the bolt must be determined by the installer, depending upon filter
weight and the material of the mounting surface.
|Connect the filter to the protective earth (PE) terminal(s).
|Remove all line side power, then connect the phase terminal(s) and neutral terminal (if any) of
the filter. The filter label may also indicate LINE (grid side terminals) and LOAD (power
electronics terminals).
|For the electrical connection of the filter terminals, apply the torques recommended on the filter
label and/or in the published filter datasheets.
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|Cable or busbar cross sections have to be chosen in accordance with national and international
electric codes and applicable product standards governing the equipment that will incorporate
the LCL filters and the equipment in use.
|Some filters provide additional terminals, e.g. for over-temperature monitoring. These features
have to be properly used before energizing the filter. If uncertain, please consult your local
Schaffner representative.
|In order to get the maximum benefit out of your LCL filter, please also consult aditional user
manuals, installation manuals, whitepaper and other material, published in the download section
of www.schaffner.com. These additional guidelines provide helpful hints for equipment related
topics as well as technical knowledge.
3. Safety notes and regulations
1. Label on equipment
Safety note regulations
2. Safety note category
Equipment installation, start
-
up, operation and maintenance (if any) have to
be carried out by a trained and
certified electrician or technician, who is
familiar with safety procedures in electrical systems. Non
-qualified persons
are not allowed to use, install, operate or maintain LCL filters!
High voltage potentials are involved in the operation of
power quality
equipment. Always remove power before handling energized parts of the
filter, and let ample time elapse for the capacitors to discharge to safe
levels (<42V). Residual voltages are to be measured both line to line and
line to earth.
Cor
rect protective earthing of the equipment must be established and the
user must be protected against supply voltage in accordance with
applicable national and local regulations. Always practice the safety
procedures defined by your company and by applicabl
e national electric
codes when handling, installing, operating or maintaining electrical
equipment.
When an EMI
-filter is required together with the LCL filter contact your local
Schaffner partner for assistance.
Some products may
include EMI-filters which may cause leakage currents
to ground. Always connect the filter to protective earth (PE) first, then
continue with the wiring of phase/neutral terminals. When decommissioning
the filter, remove the PE connection at the end.
LCL filters are working with resonance circuits to fulfill specified
performance. Always operate the system within specified switching
frequency range.
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In some filter types circuit breakers are limiting short circuit current flowing
into the capacitors in case of filter malfunction. Do not manually operate the
circuit breaker under voltage or during operation of the system.
The system performance is highly dependent on the control parameters.
The setting of the parameters must be advised or
done by a technical
AFE/AIC expert.
Follow the general installation and environmental condition notes closely.
Ensure that cooling slots (if any) are free from obstructions that could inhibit
efficient air circulation. Operate the filter within its e
lectrical, mechanical,
thermal and ambient specifications at all times.
LCL filters are lossy electrical components. Parts/surfaces of the equipment
may get hot when the filter is working (also when the system is idle).
Damping resistors can reach te
mperatures up to 275 °C.
At altitudes above 2000
m, please contact Schaffner prior to installation.
Filter suitability for a given application must ultimately be determined by the
user (the party that is putting the filter into operation) on a
case by case
basis. Schaffner will not assume liability for any consequential downtimes or
damages resulting from use of filters outside their specifications.
In case of uncertainty and questions please contact your local Schaffner
partner for assistance (details per region available at www.schaffner.com).
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Content
i. LCL filter................................................................................................................................................ 3
ii. Important user notice........................................................................................................................... 3
iii. General Safety Notes and Installation Guidelines (Cautions and Warnings) ................................ 4
General safety notes and installation guidelines (Cautions and Warnings)....................................... 4
1. Important information ........................................................................................................................... 4
2. General installation notes .................................................................................................................... 4
3. Safety notes and regulations ............................................................................................................... 5
Content ....................................................................................................................................................... 7
1. LCL filter designation............................................................................................................................ 8
2. Filter selection ....................................................................................................................................... 9
2.1 LCL Filter selection table FN 6840 .................................................................................................. 10
2.2 Filter configurations without fan for forced cooling .......................................................................... 10
2.3 Filter configurations with fan for forced cooling ............................................................................... 10
3. Filter description ................................................................................................................................. 11
3.1 General electrical specifications of LCL filter FN 6840.................................................................... 11
3.2 Additional electrical specifications ................................................................................................... 11
3.3 Cooling requirement......................................................................................................................... 12
3.4 Damping resistors ............................................................................................................................ 12
3.5 Circuit breaker.................................................................................................................................. 12
3.6 Mechanical frame sizes ................................................................................................................... 12
3.7 LCL filter FN6840 footprint............................................................................................................... 13
3.8 LCL Filter performance .................................................................................................................... 13
3.9 Drive settings ................................................................................................................................... 13
3.10 Functional diagram ........................................................................................................................ 14
3.11 EMI-filter......................................................................................................................................... 14
4. Filter appearance and elements......................................................................................................... 15
4.1 IP 00 version, frame size D - F ........................................................................................................ 15
4.2 IP 00 version, frame size H (380 A only) ......................................................................................... 15
6. Filter maintenance............................................................................................................................... 19
6.2 Fan ................................................................................................................................................... 20
6.3 Power capacitors ............................................................................................................................. 20
6.4 Electrical connections ...................................................................................................................... 20
7. Troubleshooting .................................................................................................................................. 21
Disclaimer ................................................................................................................................................ 21
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1. LCL filter designation
The designation of the standard offering for LCL filter FN6840 are shown as follow:
Figure 1 LCL filter FN6840 designation
Examples of LCL filter designations:
FN 6840-25-113-E0XXR: Filter for 50/60 Hz, up to 480 V AC grid, current rating 25A @50°C/50Hz, with
16mm2 terminals, open frame (IP 00), filter contains a damping module/resistors
FN 6840-380-118-E0FAR: Filter for 50/60 Hz, up to 480 V AC grid, current rating 380A @50°C/50Hz,
with 240mm2 terminals, open frame (IP 00), with fan and power supply, filter contains a damping
module/resistors.
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2. Filter selection
LCL filters need to be carefully selected and configured in order to fulfill the application requirements.
Therefore, please select the standard LCL filter only if the specification of the LCL filter FN6840 fulfills
your application needs. In case you have dedicated specifications to be fulfilled, please fill in following
table and send the information to your local Schaffner sales and support organization. Based on your
feedback, Schaffner will check the feasibility and provide you a customized proposal in case the
requirement can be accomplished.
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2.1 LCL Filter selection table FN 6840
2.2 Filter configurations without fan for forced cooling
Frame sizes D, E, Fand H (up to 250 A) do not require air-flow for cooling hence they are not equipped
with a fan. The cooling with natural convection is enough if the filter is operating within its specification.
2.3 Filter configurations with fan for forced cooling
Frame size H (380 A) has an integrated ventilation with an fan and auxiliary power supply. For operating
the filter within its specification, the air flow of the forced cooling needs to be ensured within the cabinet.
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3. Filter description
3.1 General electrical specifications of LCL filter FN 6840
Nominal operating voltage:
max. 480 VAC
Rated operating voltage:
max. 530 VAC
Operating frequency:
50/60 Hz
AFE/AIC Switching frequency:
3 kHz up to 10 kHz
Rated currents:
25 to 380 A
Rated inductance L2 (inverter/converter side):
8% @ 400V, 50 Hz and rated current
Rated inductance L1 (grid/line side):
4% @ 400V, 50 Hz and rated current
Overload capability:
1.6 x rated current for 1 min., ones per hour
Filter performance:
Prerequisite: Grid supply by insulated transformer
Remaining ripple current
1)
:
< 5% (max. ripplepk-pk vs. fundamentalpk-pk)
Line impedance:
Lgrid ≥ 1%
THDi
2)
:
≤ 5% acc. EN61000-3-12
High potential test voltage:
3)
P E 2480 VAC (1s)
Protection category:
IP 00 (IP20 on request)
Ambient temperature range:
-25°C to +45°C fully operational
>45°C to +70°C derated operation
4)
-25°C to +85°C transportation and storage
Flammability class:
UL 94V-2
Insulation class of magnetic components:
N (200°C)
Creepage and clearance distances:
According UL61800-5-1
Design corresponding to:
Filter: UL61800-5-1, EN61800-5-1
Chokes: EN61558-2-20 or EN60076-6
Temperature monitor output contact:
Thermal switch NC 180° C (UL-approved) to detect
overtemperature of chokes
1) for detailed resulting ripple current, please contact your local Schaffner office or partner.
2) the THDi acc. EN61000-3-12 or IEEE519 is not required for AFE applications as those standards refer to the harmonics of the
grid frequency generated by e.g. 6-pulse recifires.
3) Repetitive tests to be performed at max. 80% of above levels, for 1 second.
4) Iderated = Inominal×√((70°C-Tamb)/20°C)
3.2 Additional electrical specifications
LCL filters general electrical specifications refer to operating altitudes up to 2000m a.s.l. (6600ft).
Operation between 2000m and 4000m (6600ft and 13123ft) requires a derating for current and voltage:
- The voltage has to be de-rated because clearance between live parts has to be
increased acc. EN/IEC 60664-1
- The current has to be de-rated due to the reduced power dissipation at higher altitude.
Table 1: Altitude correction factors
Note:Do not use LCL filters in altitudes above 4000m without consulting Schaffner first.
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3.3 Cooling requirement
Please notice that only the 380A LCL filters have an embedded fan and powered supply. The lower rated
LCL filters do not require forced air cooling.
3.4 Damping resistors
The versions E0xxR have in use power resistors to ensure proper damping of the switching frequency.
The damping resistors are designed to dissipate the energy in the resonance circuit. Thus the damping
resistors can reach temperatures as high as 275°C!
Caution: risk of burning - do not touch the damping resistors during operation.
3.5 Circuit breaker
The ratings 160, 250 and 380A have installed a circuit breaker in the capacitor circuit to ensure safe
capacitor disconnection in case of a short circuit. Because the capacitors are limited to a short circuit
current of 10’000A, a safety device must be installed to protect the capacitors.
For the ratings 25, 50 and 80A the impedance of the line choke is limiting the current to a value < 10 kA.
By default, the circuit breakers are set to status “on”.
Auxiliary contacts are provided along with the circuit breaker, with one NC normally closed and one NO
normally open contact. The NO auxiliary contact must be used in the control system to ensure the
interruption of the power branch the filter is connected to. The NC auxiliary contact is avaialble to be
used for signalling and/or warning purpose.
The circuit breaker must never be switched-off manually when the application is in operation or under
voltage. There is a risk of electrical shock when doing so!
3.6 Mechanical frame sizes
The components of the LCL filters FN6840 are implemented on a base plate or base frame with 4
different frame sizes, Frame D to Frame H, from the lowest to the highest rating. Dimensions and
footprint are provided in section .
Figure 2: Overview of all IP 00 frame size versions
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3.7 LCL filter FN6840 footprint
Figure 3: Mechanical Data of FN 6840
Table 2: Dimensions of all frame sizes
3.8 LCL Filter performance
The LCL filter can achieve it’s performance, if the LCL filter FN6840 specification is suitable to the
application requirements. Additional prerequisites are that the line side is supplied by a main isolation
transformer and that the grid impedance is ≥1%. Under those conditions and within the kept filter
specifications the remaining ripple current is < 5% (max.ripple currentpk-pk vs fundamentalpk-pk).
THDi according EN61000-3-12 is <5% in any case. This value shall be used just for reference only as
that standard is not applicable for LCL filter applications.
Schaffner strongly recommends, that the LCL filter version with damping module/resistors are used in
case the AFE motor drive or AIC has no active damping function. Only in case the drive has a working
active damping function, an LCL filter without a damping module would be tolerable.
3.9 Drive settings
The performance (stability, ripple current, phase shift) is highly dependent on the control parameters.
The setting of the parameter must be advised or done by a technical expert.
It is not Schaffner’s responsibility to set up the drive correctly to make the system work properly.
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3.10 Functional diagram
LCL filter FN6840 with damping module: LCL filter FN6840 without damping module:
Filter terminals
Line L1/L2/L3
3 terminal blocks
Load L1’/L2’/L3’
3 terminal blocks
TS
- TS
Connecting terminals to thermal switch NC 180°C (UL
-
approved) to detect overload temperature in chokes
PE
Protective earth. Threaded stud with washer and nut
3.11 EMI-filter
When the LCL filter must be combined with an EMI-filter to fulfill an EMI-standard, your local Schaffner
office or Schaffner partner shall be contacted in order to support the selection of the matching product.
Note: be aware that not all EMI-filters are suitable due to unwanted resonances between LCL- and EMI-
filter
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4. Filter appearance and elements
The very compact and neat design of LCL filter FN6840 is realized by a two-level construction. The
principle filter construction of all frame size are identical, except the 380 A rating is equipped with a fan
and an auxiliary supply.
4.1 IP 00 version, frame size D - F
The general design of the IP 00 versions with damping module and without fan is shown in Figure 3:2.
The design and construction of the lower-level is shown in figure 3 left. The line choke L1 and the load
choke L2 on the base plate, which contains screw holes for wall mounting. The power terminal, the
power capacitors and the resistors of the damping module are placed on the upper-level.
Figure 3: Design of LCL filter FN6840 (Type E0XXR, frames D to F): lower level left and upper-level right
4.2 IP 00 version, frame size H (380 A only)
The design of the LCL filter 380 A with fan- and aux. power supply module (E0FAR) is shown in figure 4.
The design and construction of the lower-level is shown in figure 4 left. The line choke L1 and the load
choke L2 on the base frame, which contains screw holes for wall mounting. The power terminal, the
power capacitors and resistors of the damping module and a circuit breaker are placed on the upper-
level in figure 4 right.
The fan module is visible at the lower level.
Figure 4: Design of LCL filter FN6840 (Type E0FAR, frame H): upper-level right and lower level left.
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5. Filter installation
Please follow the simple steps below to ensure a safe and reliable filter function. Please always follow
the general safety and installation guidelines provided within this document as well as relevant local,
national or international standards that are applicable. Please note that the following installation steps
are applicable for both IP 00 and IP 20 enclosure.
Step 1: Visual inspection
All Schaffner LCL filters have undergone rigorous testing before they left our ISO 9001:2015 certified
factories. They are packed with great care in a sturdy container for international shipment.
However, carefully inspect the shipping container for damage that may have occurred in transit. Then
unpack the filter and carefully inspect for any signs of damage. Keep the shipping container for future
transportation of the filter.
In the case of damage, please file a claim with the freight forwarder involved immediately and contact
your local Schaffner partner for support. Under no circumstances install and energize a filter with visible
transportation damage.
If the filter is not going to be put in service upon receipt, store within the original container in a clean, dry
location, free of dust and chemicals and with respect to named temperature limits.
Step 2: Mounting
LCL filters are best installed as close as possible to the AFE or AIC. Ideally they are mounted next to the
rectifier or motor drive inside the electrical cabinet providing an appropriate protection. Ensure that only
qualified and trained personell has access to the equipement.
All LCL filters FN 6840 are designed for wall-mounting installation.
Important:
In order to ensure sufficient air flow, keep a clearance
of min.150mm above and below the filter to walls or
other components.
Additional work to access the device, caused by not
respected clearance distances, will be accounted
separately.
It must be ensured that the environmental temperature
is kept below 50°C with appropriate thermal
management (e.g. cabinet cooling). Filter operation in
environments with higher temperatures require a
current derating.
ECOsine™
Drive
>150mm
>150mm
>100mm
>100mm
LCL Filter
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II.1
Screw hole positions for wall mounted filters:
Frame
Drill pattern [mm]
R
S
T
D
540
180
11
E
680
220
11
F
730
250
11
H
1115
390
11
Table 3: Dimensions of frame sizes in mm
II.2
Screw selection: Schaffner recommends zinc coated hex
ribbed flange steel bolts. Respect filters weight for appropriate
choice of screws! Head diameters must not exceed these
didimensions:
M6: d ≤14.2mm, M10: d ≤21.2mm
II.3
Filter placement:
1. Set screws loose into wall, leave 5mm distance from head to
the wall.
2. Lift filter with appropriate crane, smallest types (up to 25kg)
may be lifted manually by two persons.
3. Place filter first onto lower screws…
4. ...then position it through backplane head openings on upper
screws.
5. Fix screws with appropriate torque (depending upon the
material of the back plane and local standards).
Step 3: Wiring
III.1
Verify safe disconnection of all line side power.
Consult your local safety instructions.
d
3.
4.
R
S
T
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III.2
Carefully connect protective earth (PE) wire to
adequate earth potential close to LCL filter FN6840.
Use a wire diameter of equal or bigger size as foreseen
for line/load side power cables – according to your local
codes and safety instructions.
ECOsine™
Drive
>150mm
>150mm
>100mm
>100mm
III.3
Connect PE wire of LCL filter FN6840
Connect the PE wire with appropriate cable lug to
threaded stud.
III.4
Connect LCL filter load side terminals L1’, L2’, L3’ to respective motor drive or rectifier
inputs.
The third part of LCL filter FN6840 designation is a number contains three digits, i.e. FN 6840-25-
113, which indicates power terminal type.
See FN 6840-380-118-E0FAR: Filter for 50/60 Hz, up to 480 V AC grid, current rating 380A
@50°C/50Hz, with 240mm2terminals, open frame (IP 00), with fan and power supply, filter
contains a damping module/resistors.
Note: for the recommended wire size and torque use copper wire with a temperature rating of
75°C or higher.
Note: In case the cables on the power terminals are installed without cable lug, it is
recommended to follow the maintenance according to chapter 6.
III.5
Connect temperature monitor switch TS- TS’
The monitor switch is a relay contact, which is open in
ALARM state. It is constituted by a thermal switch NC
180°C (UL-approved) to detect temperature overload of
chokes. It may either be used to remotely disconnect
the drive’s load via respective input of motor drive or
converter control (check corresponding manual) or as
alarm sensor for system control unit.
AN ENGAGED TEMPERATURE
MONITOR SWITCH MUST LEAD TO
IMMEDIATE LOAD SHUTDOWN AND
INVESTIGATION OF THE PROBLEM.
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III.
6 Connect LCL filter FN6840 line side terminals L1, L2, L3
Connect the line side terminals to power input protection (current limiting fuses – see following).
III.7
Fuses
It is recommended to add external over-current protection for the LCL filters. Table 4 shows
requested fuse current ratings for UL class J and for IEC class gG. The fuse rating is independent
of the supply voltage.
LCL filter rating
Fuse class J
Fuse class gG
All FN 6840 rated current [A] rated current
[A]
FN6840-25-113
40
35
FN6840-50-115
80
80
FN6840-80-115
150
125
FN6840-160-118
250
224
FN6840-250-118
350
300
FN6840-380-118
600
600
Table 4: Requested fuse current rating for UL class J and for IEC class gG
6. Filter maintenance
LCL filter FN6840 described in this manual are equipped with long life components that ensure a
satisfactory function for many years under normal operating conditions. Any operation under extreme
conditions such as over-temperatures, overvoltage situations, polluted environments etc. reduces the life
expectancy. Following maintenance recommendation and maintenance schedule according Table 5 will
help maximizing filter lifetime.
Warnings:
High voltage potentials are involved in the operation of this product. Always remov
e line side
power before attempting to perform maintenance and let ample time elapse for the
capacitors to discharge to safe levels (<42 V). Residual voltages are to be measured both
line to line and line to earth.
Line side power must be disconnected prior to replacement of any part.
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Year 1 2 3 4 5 6 7 8 9 10 11 12
check and clean fan(s) X X X X X X X X X X X X
replace fan(s) X X
check & tighten el. connections 1) X X X X X X X X X X X X
check el. values of capacitors X X X X X X
replace power capacitors X
1) Only external connections need to be checked.
Table 5: Maintenance schedule
6.2 Fan
LCL filter FN6840 are designed with a simple temperature management concept and therefore, fans may
have to be maintained and replaced in certain intervals to sustain the function and value of the product.
Fans are 100% field replaceable without the need to uninstall and disconnect the filter.
Forced cooling devices are needed for the operation of Schaffner LCL filter FN6840 (380 A device) up to
their nominal rating. Such cooling devices must be checked and cleaned regularly (if installed) to ensure
sufficient air flow at all times.
Note: increased audible noise is a typical indicator of a fan that needs maintenance or replacement also
outside of a maintenance schedule.
Before cleaning or replacing the cooling devices, make sure to consult the recommended maintenance
procedures and schedules of the supplier of the cooling device in use.
6.3 Power capacitors
The power capacitors supplied with the LCL filter FN6840 are high quality components with an expected
life time of up to 100’000 hours (11 years). Nevertheless, their useful service life can be shortened by
electrical or thermal stress beyond their specification.
Power capacitor damage may also be caused by severe abnormal supply voltage peaks (i.e. lightning –
depending upon system protection), but may only be recognizable through the measurement of line side
current ripple. This may be checked with a modern energy meter or by regular checkup with a power
quality analyzer. According to the above considerations, a 2 year inspection interval is advisable.
Note: an inspection should as well be performed after extreme overvoltage situations in the system.
6.4 Electrical connections
Depending upon the environment and application, electrical connections, in particular threaded bolts and
nuts, can degrade over time by means of losing their initial tightening torque. This holds true not only for
the filter, but for any such joint within an electrical installation.
Therefore, Schaffner recommends to check and tighten all electrical connections on the occasion of a
regular scheduled maintenance of the entire device that incorporates the filter.
INS 1008766 A0INS 1008766 A0INS 1008766 A