Sine Wave and EMC Output Filter for Motor Drives with a Voltage dc Link
Smoothing of PWM drive output voltage
Efficient motor protection
Reduction of common-mode interferences on
motor cables
Improvement of EMC environment
Elimination of motor bearing damages
Approvals
Possibility to use very long unshielded motor
cables
Improvement of system reliability
Features and benefits
Conversion of the PWM output signal (differential
and common-mode voltage components) of motor
drives into a smooth sine wave with low residual
ripple
Elimination of premature motor damage caused by
high dv/dt, overvoltages, motor overheating, eddy
current losses or bearing damage
Elimination of interference propagation towards
components or conductors in the vicinity
Provision of all benefits of traditional LC sine wave
filters, plus:
Allows the use of extremely long unshielded motor
cables without causing radiation problems (EN
55014, MDS clamp)
Restricts pulse currents to ground and hence limits
leakage currents in the PE
Reduces the required EMI suppresssion efforts on
the line side
Technical specifications
Current in +/- control loop
dc link voltage
Design corresponding to
1 to 2 A approx.
850 VDC max.
UL 1283, CSA 22.2 No. 8 1986, IEC/EN 60939
UL 94 V-2 or better
P –> E 2500 VDC for 2 sec
Allows the use of lower rated drives with long motor
cables due to lower losses in the IGBTs and in the
motor cable
Typical applications
Motor drive applications with extremely long motor
cables
Motor drive applications with unshielded motor
cables
Chemical and petro-chemical applications
Semi-conductor manufacturing
Mission critical applications
Flammability corresponding to
High potential test voltage
Motor cable length
Motor frequency
MTBF @ 40°C/400V (Mil-HB-217F)
Nominal operating voltage
Overload capability
Protection category
Rated currents
Residual ripple voltage
P –> P 1100 VDC for 2 sec
1000 m max.
0 to 200 Hz
>100,000 hours
3x 500/288 VAC
1.4x rated current for 1 minute, every 15 minutes
IP20
4 to 16 A @ 40 °C
<5%
Applications with multiple motors in parallel
Retrofit of motor drives into existing installations
with old wiring and motors
Switching frequency
Temperature range (operation and storage)
Voltage drop
6 to 20 kHz
-25 °C to +100 °C (25/100/21)
≤10 V @ 50 Hz
2
Output filters and load reactor
Schaffner Group
Datasheets
2014
Filter selection table
Filter
Rated current
@ 40 ºC
[A]
4
8
power rating*
Typical motor
[kW]
power loss**
Typical
[W]
connections
-29
-29
-29
-33
Input
connections
-99
-99
-99
-99
Output
Weight
[kg]
FN 530-4-99
FN 530-8-99
1.5
3.0
5.5
7.5
15
33
50
37
11.5
18.5
21
15
FN 530-16-99
FN 530-12-99
12
16
* General purpose four-pole (1500 r/min) AC induction motor rated 400 V/50 Hz.
** Exact value depends upon the motor cable type and length, switching frequency, motor frequency and further stray parameters within the system.
Typical block schematic
Connection to the dc link
For best results, the connection to the dc link of the
motor drive is required with this series of filters.
If only one connection to the dc link is brought out
of the drive («+» or «-») then the dc link cable
connections from the filter (identified by «DC+» and
«DC-» must be connected together to the «+» or «-»
motor drive connection.
The operation of the sine wave interference filter is
not seriously affected as a result. The «+» and «-»
connections on the motor drive must never be
connected together. Otherwise a short-circuit will
result.
The PWM switching frequency must lie within the
range from 6 to 20kHz in order to ensure satisfactory
operation of the filter. A lower switching frequency or
a pure square wave is unsuitable and will result in the
motor drive switching off with the error message
«overcurrent or short to earth.»
For additional information please refer to the Schaffner application note "Sine Wave Filter Solutions for Motor Drives Applications" available on the homepage
www.schaffner.com/downloads
3
Output filters and load reactor
Schaffner Group
Datasheets
2014
Mechanical data
4 to 12 A types
16 A types
Dimensions
A
B
C
E
F
4A
390
150
350
373
6.5
1.5
M6
19
75
44
90
8A
390
180
350
370
8.7
1.5
M6
19
75
44
90
12 A
390
215
350
370
8.7
1.5
M6
19
75
44
90
16 A
140
350
230
310
330
8.7
95
D
G
H
I
J
2.3
25
K
L
W
X
Y
Z
720 +15/-0
120
100
70
107
720 +15/-0
120
100
70
137
720 +15/-0
120
100
70
172
107.5
720 +15/-0
120
100
70
M6
181
All dimensions in mm; 1 inch = 25.4 mm
Tolerances according: ISO 2768-m / EN 22768-m
Filter input connector cross sections
-29
-33
Solid wire
Flex wire
AWG type wire
Recommended torque
Please visit www.schaffner.com to find more details on filter connectors.
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