Schaffner FN5420 Operating manual

Schaffner EMV AG
Nordstrasse 11e |4542 Luterbach |Switzerland |Main [phone] |schaffner.com
USER AND INSTALLATION MANUAL
Output Filters FN5420 and Reactors RWK5420

1/52 User and installation manual Output Filters FN5420 and Reactors RWK5420
Revision: 05 (February 2023)
English version (original instructions)
The most current edition of this document (PDF format) can be obtained from your contact of the
Schaffner organization or at schaffner.com/downloads.
Other technical documentation of our products is also available in the download area of our website
schaffner.com.
Document name:
User and installation manual Output Filters FN5420 and Reactors RWK5420 rev05.pdf
Valid for Output Filters FN5420 and Reactors RWK5420 version:
sine wave filter FN5420 (all versions)
dv/dt filter RWK5420 (all versions)
Version history
Revision
Date
Description
01
October 2021
Initial version
02
December 2021
Section 2, step 2: mistake in the type of filter to remove common mode
interference; differential mode filter -> common mode filter
Figure 23 corrected, capacitors connected in delta and not star.
03
March 2022
Table 5 FN5420 IP20 selection table FN5420-13-44-E2FXT -> FN5420-13-33-
E2FXT
Table 8 and Table 10: Flex wire AWG corrected and metric added
04
December 2022
New Schaffner branding template
Section i, The filter reduces -> The reactor reduces
Figure 23 and Figure 24 U1,V1,W1 -> U,V,W, U2,V2,W3 -> U’,V’,W’ corrected to
reflect the marking on the product.
05
February 2023
Cover picture updated
Figure 24 correction of the legend for power capacitor (without resistance)
Minor template cosmetic correction

User and installation manual Output Filters FN5420 and Reactors RWK5420 2/52
i. Schaffner output filter
FN5420 and RWK5420 product highlights
Whenever electricity is used to drive an equipment, in particular when a motor drive is controlling the
speed of an electric motor special attention for the noises generated by the motor drives need to be
taken into considerations. Schaffner sine wave filters help to avoid problems that can result in purely
functional difficulties to very severe motor damage.
Sine wave filters FN5420 series offer state of the art motor protection for the most demanding
applications. By installing a sine wave filter between your drive and motor:
▪The filter converts the rectangular PWM output voltage of the drive into a smooth sinusoidal
wave form signal with low residual ripple and without any voltage peaks between phases.
▪The filter eliminates premature damage of the motor caused by high dv/vt, overvoltage, cable
ringing and motor overheating. It improves bearing lifetime by reducing the currents circulating
through it
i
.
▪It allows extended motor cable length to be used between drive and motor.
Dv/dt reactor RWK5420 series offer economical motor protection for various applications. By installing
a dv/dt reactor between your drive and motor:
▪The reactor reduces the steep dv/dt generated by the IGBT in the inverter to a level making it
possible to fulfill standard as IEC 60034-17/25.
▪The reactor reduces premature damage of the motor caused by high dv/vt, overvoltage, cable
ringing, motor overheating and eddy current losses.
This user manual is intended to support designers, installers, and application engineers with filter
selection, installation, application, and maintenance. It provides helpful solutions to overcome motor
protection challenges and answers frequently asked questions.
If you require additional support, please feel free to contact Schaffner or our local partner.
i
In case of problem with bearing current, sine wave filter plus addons type FN5030 would eliminate the flashover created at
switching, increasing even more the bearing total lifetime.

3/52 User and installation manual Output Filters FN5420 and Reactors RWK5420
Performance Guarantee
The remaining voltage and current ripple at motor terminals is reduced to values <5% according to EN
61000-2-2.
ii. Minimum system Requirements
The highest performance levels of the selected filter will be achieved when the following system
conditions are met:
▪Motor frequency: up to 60Hz without derating and up to 200Hz with derating (see section 2.4.2)
▪Maximum surrounding air temperature: 70°C for filter sizes 26 to 1'100A and 100°C for filter
sizes 2.3 to 18A, always with derating above 45°C.
▪Nominal voltage: ±10%
▪Voltage unbalance (at filter input): <3%
▪Maximum DC link voltage: 750VDC
iii. Important user notice
Schaffner sine wave filters are designed for the operation on the output (motor) side of converters, such
as AC or DC motor drives. 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 use or application of Schaffner sine wave filters beyond their specifications. Schaffner
sine wave filters are not designed for single-phase or split-phase applications.

User and installation manual Output Filters FN5420 and Reactors RWK5420 4/52
i. General Safety Notes and Installation Guidelines
(Cautions and Warnings)

5/52 User and installation manual Output Filters FN5420 and Reactors RWK5420
Table of Contents
1Sine wave filter FN5420 designation ..............................................7
1.1 Sine wave filter designation ........................................................................... 7
1.1.1 Example of sine wave filter designations .............................................................................. 7
1.2 Dv/dt reactor designation ............................................................................... 8
1.2.1 Example of sine wave filter designations .............................................................................. 8
1.3 Additional Resources...................................................................................... 8
1.4 Naming convention ......................................................................................... 8
2Filter selection..................................................................................9
2.1 Filter selection table FN5420 IP00................................................................ 12
2.2 Filter selection table FN5420 IP20................................................................ 13
2.3 Filter selection table RWK5420..................................................................... 14
2.4 Derating.......................................................................................................... 15
2.4.1 Temperature derating.......................................................................................................... 15
2.4.2 Motor frequency derating .................................................................................................... 16
2.4.3 Calculation example of derating.......................................................................................... 16
3Filter description............................................................................17
3.1 General electrical specifications FN5420.................................................... 17
3.2 General electrical specifications RWK5420 ................................................ 18
3.3 Power losses.................................................................................................. 19
3.3.1 Power loss calculation example .......................................................................................... 19
3.4 Additional electrical specifications.............................................................. 20
3.5 Screw size, torque and cable cross-section requirement.......................... 21
3.5.1 Power terminals................................................................................................................... 21
3.5.2 Auxiliary signal and earth terminals..................................................................................... 23
3.6 Thermal protection switch specifications ................................................... 24
3.7 Cooling requirement...................................................................................... 24
3.8 Mechanical data............................................................................................. 25
3.8.1 Dimensions FN5420 IP00 ................................................................................................... 25
3.8.2 Dimensions FN5420 IP20 ................................................................................................... 30
3.8.3 Dimensions RWK5420 ........................................................................................................ 32

User and installation manual Output Filters FN5420 and Reactors RWK5420 6/52
3.9 Functional diagram........................................................................................ 36
4Filter appearance and elements....................................................37
5Filter installation ............................................................................42
5.1 Step 1: Visual inspection .............................................................................. 42
5.2 Step 2: Mounting............................................................................................ 42
5.2.1 Prepare the fixation ............................................................................................................. 45
5.2.2 Screw selection ................................................................................................................... 45
5.2.3 Filter placement................................................................................................................... 45
5.3 Step 3: Wiring................................................................................................. 47
5.3.1 Verify safe disconnection of all line side power................................................................... 47
5.3.2 Carefully connect protective earth (PE) wire to adequate earth potential close to the device
47
5.3.3 Connect PE wire on the device ........................................................................................... 47
5.3.4 Connect shielding for shielded cables................................................................................. 47
5.3.5 Connect shielding for shielded cables................................................................................. 48
5.3.6 Connect the device on drive side ........................................................................................ 48
5.3.7 Connect output filter motor side .......................................................................................... 48
5.3.8 Connect monitor switch TS- TS’.......................................................................................... 48
6Filter maintenance .........................................................................49
6.1 Maintenance schedule .................................................................................. 49
6.2 Fan.................................................................................................................. 49
6.3 Power capacitors........................................................................................... 50
6.4 Electrical connections................................................................................... 50
7Troubleshooting.............................................................................51

7/52 User and installation manual Output Filters FN5420 and Reactors RWK5420
1 Sine wave filter FN5420 designation
1.1 Sine wave filter designation
The filter designation is structured from the output filters characteristics.
Figure 1 Schaffner sine wave filter designation
▪The first part of the designation ‘FN5420-xxx-yy-E_ _ _ _’ refer to the sine wave filter from
Schaffner output filter products.
▪The second part of the designation ‘FN5420-xxx-yy-E_ _ _ _’ indicates the current rating at
rated voltage and 50Hz (note that it can be rounded to 2 significant digits, please check the
exact value in datasheet and section 3.1 below)
▪The third part of the designation ‘FN5420-xxx-yy-E_ _ _ _’ indicates the filter terminal type. For
more details, please consult the datasheet and section 3.1 below.
▪The fourth part of the designation ‘FN5420-xxx-yy-E__ _ _’ contains 4 slots, the first is the IP
degree of protection, second, the presence of active ventilation (fan), third the presence of a
power supply for the fan (if present) and the last one indicates the presence or not of a temper-
ature switch.
Note that only specific combinations exist, please refer to the selection tables for complete list.
1.1.1 Example of sine wave filter designations
FN5420-90-99-E0XXT: Output filter type sine wave filter for 50/60Hz, rated 90A at nominal voltage and
50Hz, with terminal type 99 (bus bar), rated IP00, without fan nor power supply and with temperature
switch.
FN5420-13-44-E2FXT: Output filter type sine wave filter for 50/60Hz, rated 13.2A at nominal voltage
and 50Hz (note that the last digit precision on rated current is not visible directly in the designation), with
terminal type 44, rated IP20 (enclosure), with fan and no power supply and with temperature switch.

User and installation manual Output Filters FN5420 and Reactors RWK5420 8/52
1.2 Dv/dt reactor designation
The filter designation is structured from the output filters characteristics.
Figure 2 Schaffner output filter reactor designation
▪The first part of the designation ‘RWK5420-xxx-yy-E_ _ _ _’ refer to the dv/dt reactors 6% from
Schaffner output filter products.
▪The second part of the designation ‘RWK5420-xxx-yy-E_ _ _ _’ indicates the current rating at
rated voltage and 50Hz (note that it can be rounded to 2 significant digits, please check the
exact value in datasheet and section 3.2 below).
▪The third part of the designation ‘RWK5420-xxx-yy-E_ _ _ _’ indicates the filter terminal type.
For more details, please consult the datasheet and section 3.2 below.
▪The fourth part of the designation ‘RWK5420-xxx-yy-E__ _ _’ contains 4 slots, the first is the IP
degree of protection, second, the presence of active ventilation (fan), third the presence of a
power supply for the fan (if present) and the last one indicates the presence or not of a temper-
ature switch.
Note that only specific combinations exist, please refer to the selection tables for complete list.
1.2.1 Example of sine wave filter designations
RWK5420-90-99-E0XXT: Output filter type dv/dt reactor for 50/60Hz, rated 90A at nominal voltage and
50Hz, with terminal type 99 (bus bar), rated IP00, without fan nor power supply and with temperature
switch.
1.3 Additional Resources
The Schaffner group does provide a number of additional resources available at schaffner.com to
understand power quality in general and product in particular.
1.4 Naming convention
PWM Pulse width modulation
fPWM Frequency of the PWM (drive frequency)

9/52 User and installation manual Output Filters FN5420 and Reactors RWK5420
2 Filter selection
Schaffner output filters need to be selected according to the applications specifications and needs.
Step 1: motor frequency
Sine wave filter FN5420 series and dv/dt reactor RKW5420 series work at rated current up to a motor
frequency of 60Hz and with a derating up to 200Hz, see derating in section 2.4.2.
Table 1 motor frequency
Filter series
Network frequency
Maximum motor
frequency at rated
current
Maximum motor
frequency with a
derating
FN5420
50/60Hz
60Hz
200Hz
RWK5420
50/60Hz
60Hz
200Hz
Step 2: motor cable characteristics
The motor cable length between sine wave filter and the motor, is an important metric for the proper
working of the drive, sine wave filter and motor. The maximum cable length is either limited by the drive
or the filter. Schaffner sine wave filter FN5420 series bring very few limitations in this regard with a
maximum cable length of at least 1000m for all filter size and up to 2000m for larger filters at the minimum
fPWM. It is often the case that the drive is more restrictive on the cable length, furthermore the total
voltage-drop of the filter plus cable is to be considered, please consult the drive user manual for more
information.
The type of cable, whenever it is shielded or unshielded has also an influence on the performance.
Using an unshielded cable without addition common mode filter cause common mode interference on
the line. Results and behavior might vary for each specific application. Schaffner recommend using
shielded cable between the sine wave filter and the motor or unshielded cable with an additional
common mode filter, i.e. Schaffner sine wave filter plus FN5030 series (not part of this user manual).
For more information, please consult the Schaffner output filter product page at schaffner.com or contact
your Schaffner representative.
Table 2 motor cable at minimum fPWM
Filter series
Maximum unshielded cable
length*
Maximum shielded cable
length
FN5420 up to 250A
1000m
1000m
FN5420 from 300A to 630A
1500m
1500m
FN5420 from 710A to 1000A
2000m
2000m
RWK5420
100m**
100m**
* Usage of shielded cable is still recommended. Drive and system compatibility to be checked.
** See limitation according to drive switching frequency in step 3
For sine wave filter FN5420, the above limits are given at the minimum allowed fPWM. For other
frequencies see example in the Figure 3 below. For fPWM limitation see step 3 below.

User and installation manual Output Filters FN5420 and Reactors RWK5420 10/52
Figure 3 FN5420 maximum cable length by filter size and fPWM
Step 3: drive switching frequency
The usage of sine wave filter imposes some limit on the switching frequency of the drive (fPWM). The
minimum fPWM is dependent on the filter size and the maximum fPWM is the same for the whole series,
see Table 3 below.
Dv/dt reactor RWK5420 series doesn’t have any minimum fPWM but is still limited to the same maximum
fPWM than sine wave filter FN5420 series. The maximum switching frequency must be reduced
according to the cable length or the cable length must be limited for a given switching frequency. These
limits are giving in the Table 3 and Figure 4 below and in the datasheet.
Table 3 minimum and maximum switching frequency
Filter series
Minimum switching
frequency (fPWM)
Maximum switching
frequency (fPWM)
FN5420 up to 110A
4kHz
16kHz
FN5420 from 145A
2kHz
16kHz
RWK5420 up to 110A
None
4kHz with 100m cable
16kHz with 20m cable
Other values see Figure 4
RWK5420 from 145A
None
16kHz
0
200
400
600
800
1000
1200
1400
1600
1800
2000
2.3 3.1 5.9
10.2 13.2
18 26 32 38 45 60 75 90
110 145 180 200 250 302 400 477 630 710 800
1000
Maximum cable length [m]
Filter size by rated current [A]
Motor cable length @min. fPWM Motor cable length @2x min. fPWM

11/52 User and installation manual Output Filters FN5420 and Reactors RWK5420
Figure 4 RWK5420 limitation in switching frequency and cable length
Step 4: motor protection and acoustic noise
Output filters are mean to filter the signal coming out of the drive feeding the motor. Filter type dv/dt
reactor, like RWK5420 series, allow to reduce the voltage rise (dv/dt) visible by the motor. This reduces
the stress on the motor insulation, reduce the temperature of the motor and thus increase its total
lifetime.
Sine wave filter offers more in terms of motor protection by providing a sinusoidal phase to phase voltage
to the motor, this will bring the stress on the insulation and the temperature rise to the minimum
physically possible level. In addition, the usage of sine wave filter reduces the current flowing between
the rotor and the stator through the motor bearing (i.e. bearing current)
i
, increasing furthermore the
service life time of the motor. Finally, sine wave filter reduces motor acoustic noise, improving the
comfort at the facility where the motor is installed.
i
In case of problem with bearing current, sine wave filter plus addons type FN5030 would eliminate the flashover created at
switching, increasing even more the bearing total lifetime.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
020 40 60 80 100
Switching frequency (fPWM) [kHz]
Cable length [m]
fPWM at 400V
fPWM at 480V

User and installation manual Output Filters FN5420 and Reactors RWK5420 12/52
2.1 Filter selection table FN5420 IP00
Table 4 FN5420 IP00 selection table
Filter
Rated current @ 45°C/up to 60Hz
Typical motor drive power rating @ 400 V*
Typical motor drive power rating @ 480 V**
Nominal inductance
Nominal capacitance***
Min. switching frequency
Typical Power Loss at rated current 400V 50Hz ,45°C, and full load****
Weight
Terminal
[A]
[kW]
[kW]
[mH]
[µF]
[kHz]
[W]
[kg]
FN5420-2.3-88-E0XXT
2.3
0.75
0.90
19.2
3x0.47
4
41
1.20
88
FN5420-3.1-88-E0XXT
3.1
1.1
1.3
14.2
3x0.68
4
45
1.55
88
FN5420-5.9-88-E0XXT
5.9
2.2
2.6
7.48
3x1.5
4
76
2.2
88
FN5420-10-88-E0XXT
10.2
4.0
4.8
4.32
3x2.2
4
91
5.1
88
FN5420-13-89-E0XXT
13.2
5.5
6.6
3.34
3x3.0
4
123
5.5
89
FN5420-18-89-E0XXT
18
7.5
9.0
2.45
3x3.7
4
150
6.6
89
FN5420-26-92-E0XXT
26
11
13
1.70
3x5
4
127
9.5
92
FN5420-32-92-E0XXT
32
15
18
1.38
3x6
4
196
11.9
92
FN5420-38-92-E0XXT
38
19
22
1.16
3x8
4
229
12.1
92
FN5420-45-92-E0XXT
45
22
26
0.980
3x8
4
272
13.7
92
FN5420-60-92-E0XXT
60
30
36
0.735
3x12
4
283
18.5
92
FN5420-75-99-E0XXT
75
37
44
0.588
3x15
4
154
21.5
99
FN5420-90-99-E0XXT
90
45
54
0.490
3x20
4
239
25.0
99
FN5420-110-99-E0XXT
110
55
66
0.401
3x20
4
283
28.5
99
FN5420-145-99-E0XXT
145
75
90
0.304
3x100
2
472
56
99
FN5420-180-99-E0XXT
180
90
108
0.245
3x150
2
658
58
99
FN5420-200-99-E0XXT
200
110
132
0.221
3x150
2
707
60
99
FN5420-250-99-E0XXT
250
132
158
0.176
3x200
2
882
76
99
FN5420-300-99-E0XXT
302
160
192
0.146
3x250
2
936
98
99
FN5420-400-99-E0XXT
400
200
240
0.110
3x300
2
1023
128
99
FN5420-480-99-E0XXT
477
250
300
0.092
3x350
2
1318
155
99
FN5420-630-99-E0XXT
630
315
378
0.070
3x500
2
1459
185
99
FN5420-710-99-E0XXT
710
355
426
0.062
3x550
2
1922
220
99
FN5420-800-99-E0XXT
800
400
480
0.055
3x600
2
2062
262
99
FN5420-1000-99-E0XXT
1000
500
600
0.044
3x750
2
2315
366
99
**** General purpose four-pole (1500 r/min) AC induction motor rated 400 V/50 Hz.
**** General purpose four-pole (1500 r/min) AC induction motor rated 480 V/50 Hz.
****Total capacitance value between phases. Capacitor connection in delta (Δ) for all versions.
**** See section 3.3 for calculation of the filter power loss at other operation point. Exact value depends on the motor cable length
and type, switching frequency and further stray parameters of the system.

13/52 User and installation manual Output Filters FN5420 and Reactors RWK5420
2.2 Filter selection table FN5420 IP20
Table 5 FN5420 IP20 selection table
Filter
Rated current @ 45°C up to 60Hz
Typical motor drive power rating @ 400 V*
Typical motor drive power rating @ 480 V**
Nominal inductance
Nominal capacitance***
Min. switching frequency
Typical Power Loss at rated current 400V 50Hz ,45°C, and full load****
Weight
Terminal
Frame size
[A]
[kW]
[kW]
[mH]
[µF]
[kHz]
[W]
[kg]
FN5420-2.3-44-E2XXT
2.3
0.75
0.90
19.2
3x0.47
4
41
2.4
44
A
FN5420-3.1-44-E2XXT
3.1
1.1
1.3
14.2
3x0.68
4
45
2.8
44
A
FN5420-5.9-44-E2FXT
5.9
2.2
2.6
7.48
3x1.5
4
76
4.0
44
B
FN5420-10-44-E2FXT
10.2
4.0
4.8
4.32
3x2.2
4
91
6.8
44
B
FN5420-13-33-E2FXT
13.2
5.5
6.6
3.34
3x3.0
4
123
7.2
33
C
FN5420-18-33-E2FXT
18
7.5
9.0
2.45
3x3.7
4
150
7.9
33
C
FN5420-26-33-E2FXT
26
11
13
1.70
3x5
4
127
11.8
33
C
FN5420-32-33-E2FXT
32
15
18
1.38
3x6
4
196
14.2
33
C
FN5420-38-33-E2FXT
38
19
22
1.16
3x8
4
229
14.4
33
C
FN5420-45-34-E2FXT
45
22
26
0.980
3x8
4
272
21
34
D
FN5420-60-34-E2FXT
60
30
36
0.735
3x12
4
283
25
34
D
FN5420-75-35-E2FXT
75
37
44
0.588
3x15
4
154
30
35
E
FN5420-90-35-E2FXT
90
45
54
0.490
3x20
4
239
34
35
E
FN5420-110-35-E2FXT
110
55
66
0.401
3x20
4
283
37.5
35
E
**** General purpose four-pole (1500 r/min) AC induction motor rated 400 V/50 Hz.
**** General purpose four-pole (1500 r/min) AC induction motor rated 480 V/50 Hz.
****Total capacitance value between phases. Capacitor connection in delta (Δ) for all versions.
**** See section 3.3 for calculation of the filter power loss at other operation point Exact value of the complete system depends
on the motor cable length and type, switching frequency and further stray parameters of the system.

User and installation manual Output Filters FN5420 and Reactors RWK5420 14/52
2.3 Filter selection table RWK5420
Table 6 RWK5420 selection table
Filter
Rated current @ 45°C/up to 60Hz
Typical motor drive power rating @ 400 V*
Typical motor drive power rating @ 480 V**
Nominal inductance
Typical Power Loss at rated current 400V 50Hz ,45°C, and full load***
Weight
Terminal
[A]
[kW]
[kW]
[mH]
[W]
[kg]
RWK5420-2.3-88-E0XXT
2.3
0.75
0.90
19.2
41
1.05
88
RWK5420-3.1-88-E0XXT
3.1
1.1
1.3
14.2
45
1.40
88
RWK5420-5.9-88-E0XXT
5.9
2.2
2.6
7.48
76
2.0
88
RWK5420-10-88-E0XXT
10.2
4.0
4.8
4.32
91
4.8
88
RWK5420-13-89-E0XXT
13.2
5.5
6.6
3.34
123
5.1
89
RWK5420-18-89-E0XXT
18
7.5
9.0
2.45
150
6.2
89
RWK5420-26-92-E0XXT
26
11
13
1.70
127
8.9
92
RWK5420-32-92-E0XXT
32
15
18
1.38
196
11.2
92
RWK5420-38-92-E0XXT
38
19
22
1.16
229
11.4
92
RWK5420-45-92-E0XXT
45
22
26
0.980
272
12.8
92
RWK5420-60-92-E0XXT
60
30
36
0.735
283
17.5
92
RWK5420-75-99-E0XXT
75
37
44
0.588
154
20.3
99
RWK5420-90-99-E0XXT
90
45
54
0.490
239
23.6
99
RWK5420-110-99-E0XXT
110
55
66
0.401
283
27.1
99
RWK5420-145-99-E0XXT
145
75
90
0.304
472
51
99
RWK5420-180-99-E0XXT
180
90
108
0.245
658
52
99
RWK5420-200-99-E0XXT
200
110
132
0.221
707
54
99
RWK5420-250-99-E0XXT
250
132
158
0.176
882
69
99
RWK5420-300-99-E0XXT
302
160
192
0.146
936
90
99
RWK5420-400-99-E0XXT
400
200
240
0.110
1023
118
99
RWK5420-480-99-E0XXT
477
250
300
0.092
1318
136
99
RWK5420-630-99-E0XXT
630
315
378
0.070
1459
164
99
RWK5420-710-99-E0XXT
710
355
426
0.062
1922
200
99
RWK5420-800-99-E0XXT
800
400
480
0.055
2062
239
99
RWK5420-1000-99-E0XXT
1000
500
600
0.044
2315
339
99
**** General purpose four-pole (1500 r/min) AC induction motor rated 400 V/50 Hz.
**** General purpose four-pole (1500 r/min) AC induction motor rated 480 V/50 Hz.
****See section 3.3 for calculation of the filter power loss at other operation point Exact value of the complete system depends
on the motor cable length and type, switching frequency and further stray parameters of the system.

15/52 User and installation manual Output Filters FN5420 and Reactors RWK5420
2.4 Derating
Sine wave filter FN5420 and dv/dt reactor RWK5420 might be applied with derated current when it is
applied beyond specification. Below is the calculation of temperature derating and motor frequency
derating.
2.4.1 Temperature derating
All sine wave filter FN5420 series and dv/dt reactor RWK5420 series are able to operate at rated current
up to an ambient temperature of 45°C (measured next to the device, i.e. inside a cabinet). It is possible
to use the filter and reactor above this limit, but a derating must be applied on the maximum current
going through the filter.
The derating calculation is as follow:
  
 
 
 
 
 󰇛󰇜
 󰇛󰇜
Please note that the maximum allowed temperature is a fixed value from the product specification, but
it is not the same depending on the filter size (smaller filter have a higher tolerance).
Filter type
Maximum allowed ambient temperature (Tmax)
FN5420 sizes 2.3A to 18A
100°C
FN5420 sizes 26A to 1000A
70°C
RWK5420 sizes 2.3A to 18A
100°C
RWK5420 sizes 26A to 1000A
100°C
Note that you can use a spreadsheet to easily calculate the result as follow:
Inom [A]
75
Tamb [°C]
50
Tnom [°C]
45
Tmax [°C]
70
Iderated [A]
Formula
Formula: =Inom*SQRT((Tmax-Tamb)/(Tmax-Tnom))

User and installation manual Output Filters FN5420 and Reactors RWK5420 16/52
2.4.2 Motor frequency derating
All sine wave filter FN5420 series and dv/dt reactor RWK5420 series can operate at rated current for a
motor frequency up to 60Hz. They can also operate in case of increased motor speed with motor
frequency up to 200Hz by applying a derating on the maximum current allowed in the filter or reactor.
For motor frequency of 100Hz the maximum allowed current in the filter or reactor must be derated to
90% of its rated value (0.9 times the value from the datasheet or value calculated according to the
ambient temperature derating).
For motor frequency of 200Hz the maximum allowed current in the filter or reactor must be derated to
50% of its rated value (0.5 times the value from the datasheet or value calculated according to the
ambient temperature derating).
All intermediary values can be optain from the curve in Figure 5
Figure 5 Curve of the current derating according to the motor frequency
2.4.3 Calculation example of derating
Example 1: to select a 10A sine wave filter for a 400V 50Hz application that will be running in a cabinet
where the ambient temperature can reach up to 60°C. The 10.2A will obsiouly not fit as we need to apply
a derating due to the ambient temperature higher than 45°C. We would select the size above, 13.2A to
make the calculation.
  
   
20
30
40
50
60
70
80
90
100
110
20 40 60 80 100 120 140 160 180 200 220
Max. current [%]
Motor frequency [Hz]

17/52 User and installation manual Output Filters FN5420 and Reactors RWK5420
3 Filter description
3.1 General electrical specifications FN5420
Nominal operating voltage:
3x 480 V AC
Rated operating voltage:
3x 530 V AC
Operating frequency:
Up to 60 Hz (up to 200Hz with derating)
Network:
TN, TT, IT
Minimum switching frequency
2.3 to 110A = 4kHz
145 to 1000A = 2kHz
Maximum switching frequency
16 kHz
Residual ripple voltage
<5% at nominal operation
High potential test voltage: 1)
P →E 2480 VAC (1s)
Overvoltage Category (IEC60664-1):
III
Protection category:
IP 00, IP 20
Pollution degree:
PD3 (according to standard IEC 60664-1)
Cooling:
IP00: AN
IP20: AF 2m/s
Overload capability:
1.5x rated current for 1 minute, once per hour
Capacitive current @ no load:
<20% of rated input current, at 400 V AC
Ambient temperature range:
-40°C to +45°C fully operational
-40°C to +70°C with derating3) for sizes ≥ 26A
-40°C to +100°C with derating3) for sizes ≤ 18A
-40°C to +85°C transportation and storage
Climatic Class (IEC60068-1):
40/070/21
Flammability class:
UL 94V-0
Insulation class of magnetic components:
N (200°C)
Design corresponding to:
UL 61800-5-1, EN 61800-5-1
MTBF @ 45°C/400 V (Mil-HB-217F):
>500,000 hours
MTTR:
IP00: 20 min (capacitor replacement)
IP20: 30 min (capacitor and fan replacement)
Lifetime (calculated):
≥10 years with maintenance
Safety monitor output signal:
Thermal switch NC 180° C (UL-approved) to detect
overload of chokes
1) Repetitive tests to be performed at max. 80% of above levels, for 2 seconds.
2) Magnetic current gives the limit of saturation, above this value the performance cannot be guarantee.
3) See applicable derating in section 2.4.1

User and installation manual Output Filters FN5420 and Reactors RWK5420 18/52
3.2 General electrical specifications RWK5420
Nominal operating voltage:
3x 480 V AC
Rated operating voltage:
3x 530 V AC
Operating frequency:
Up to 60 Hz (up to 200Hz with derating)
Network:
TN, TT, IT
Minimum switching frequency
None
Maximum switching frequency
16 kHz
Residual ripple voltage
<5% at nominal operation
High potential test voltage: 1)
P →E 2480 VAC (1s)
Overvoltage Category (IEC60664-1):
III
Protection category:
IP 00
Pollution degree:
PD3 (according to standard IEC 60664-1)
Cooling:
Natural cooling (AN)
Overload capability:
1.5x rated current for 1 minute, once per hour
Ambient temperature range:
-40°C to +45°C fully operational
-40°C to +100°C with derating3)
-40°C to +100°C transportation and storage
Climatic Class (IEC60068-1):
40/100/21
Flammability class:
UL 94V-0
Insulation class of magnetic components:
N (200°C)
Design corresponding to:
EN 61558-2-20 or EN 60076-6
MTBF @ 45°C/400 V (Mil-HB-217F):
>500,000 hours
Lifetime (calculated):
≥10 years with maintenance
Safety monitor output signal:
Thermal switch NC 180° C (UL-approved) to detect
overload of chokes
1) Repetitive tests to be performed at max. 80% of above levels, for 2 seconds.
2) Magnetic current gives the limit of saturation, above this value the performance cannot be guarantee.
3) See applicable derating in section 2.4.1

19/52 User and installation manual Output Filters FN5420 and Reactors RWK5420
3.3 Power losses
The typical power losses given in Table 4, Table 5 and Table 6 are valid for the rated current at 400V
50Hz. Other measurement points can be calculated for partial load and various frequency usage
according to Figure 6.
Motor speed 100% is matching the nominal speed at 50Hz. For reduced motor speed, use the curves
given at 90%, 50% or 10%, select the closest one.
Nominal current is given at 100% (right of the chart), for reduced current follow the curve to the left.
For each combination of relative motor speed and relative current, you get a relative power loss in
percentage. Apply this percentage to the typical power losses given in Table 4, Table 5 and Table 6 to
get the matching typical power loss at the selected operation point. See also an example below.
Note the influence from the voltage between 400V and 500V is minimal and could be ignored in this
calculation.
Figure 6 power loss calculation chart
3.3.1 Power loss calculation example
For a system using a sine wave filter type FN5420-45-92-E0XXT you take the typical power loss given
in Table 4, 272W. This typical power loss is for 400/500V 50Hz at nominal current of 45A.
If you want to calculate the typical power loss at 25Hz motor speed and 36A operation point, you select
the motor speed 50% curve (25/50=50%) and follow the curve up to 80% (36/45=80%) and read the
relative value matching on the vertical axis. You get 60% of relative power loss. You apply 60% to the
typical power loss given in the Table 4, 272*60% = 163W.
In this example the typical power loss at 25Hz, 36A will be 163W.
0
20
40
60
80
100
120
20 30 40 50 60 70 80 90 100
Relative power loss [%]
Current relative to nominal [%]
Motor speed 10% Motor speed 50% Motor speed 90% Motor speed 100%