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English (US)
7.7 RFI filters
To meet the EMC requirements, the CUE comes with the
following types of built-in radio frequency interference filter (RFI).
* Single-phase input - three-phase output.
Description of RFI filter types
RFI filter types are according to EN 61800-3.
7.7.1 Equipment of category C3
• This type of power drive system (PDS) is not intended to be
used on a low-voltage public network which supplies domestic
premises.
• Radio frequency interference is expected if used on such a
network.
7.8 Output filters
Output filters are used for reducing the voltage stress on the
motor windings and the stress on the motor insulation system as
well as for decreasing acoustic noise from the variable-
frequency-driven motor.
Two types of output filter are available as accessories for the
CUE:
•dU/dt filters
• sine-wave filters.
Use of output filters
The lengths stated apply to the motor cable.
7.9 Motor cable
Figures 41 and 42 show installations with and without filter and
where to use screened and unscreened cable.
Fig. 41 Example of installation without filter
Fig. 42 Example of installation with filter. The cable between
the CUE and filter must be short.
Fig. 43 Submersible pump without connection box.
Frequency converter and filter installed close to the
well.
* Both ends of the screened cable between filter and connection
box must be connected to ground.
Fig. 44 Submersible pump with connection box and screened
cable. Frequency converter and filter installed far away
from the well and connection box installed close to the
well.
Voltage Typical shaft power P2 RFI filter type
1 x 200-240 V*
1.5 - 10 Hp
(1.1 - 7.5 kW)
C1
3 x 200-240 V
1-60 Hp
(0.75 - 45 kW)
C1
3 x 380-500 V
0.75 - 125 Hp
(0.55 - 90 kW)
C1
3 x 525-600 V
1-10 Hp
(0.75 - 7.5 kW)
C3
3 x 525-690 V
15-125 Hp
(11-90 kW)
C3
C1: For use in domestic areas.
C3:
For use in industrial areas with own low-voltage
transformer.
Pump type
Typical shaft
power P2
dU/dt
filter
[ft. (m)]
Sine-wave
filter
[ft. (m)]
SP, BM, BMB with
380 V motor and up
Up to 10 Hp
(7.5 kW)
-
0-1000 ft.
(0-300 m)
15 Hp (11 kW)
and up
0-500 ft.
(0-150 m)
500-1000 ft.
(150-300 m)
Other pumps, noise
reduction
Up to 10 Hp
(7.5 kW)
-
0-1000 ft.
(0-300 m)
15 Hp (11 kW)
and up
0-500 ft.
(0-150 m)
500-1000 ft.
(150-300 m)
Other pumps, higher
noise reduction
Up to 10 Hp
(7.5 kW)
-
0-1000 ft.
(0-300 m)
15 Hp (11 kW)
and up
-
0-1000 ft.
(0-300 m)
Pumps with 690 V
motor
All -
0-1000 ft.
(0-300 m)
TM06 3251 1214TM06 3252 1214 TM06 3253 1214TM06 3254 1214
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