Rfi Filters - Grundfos CUE Series Installation And Operating Instructions Manual

6.3 RFI filters

To meet the EMC requirements, CUE comes with the following
types of built-in radio-frequency interference filter (RFI).
Voltage Typical shaft power P2
[V] [kW (hp)]
1.1 - 7.5
1 x 200-240*
(1.5 - 10 hp)
0.75 - 45
3 x 200-240
(1-60 hp)
0.55 - 90
3 x 380-500
(0.75 - 125 hp)
110-250
3 x 380-500
(150-350 hp)
0.75 - 7.5
3 x 525-600
(1-10 hp)
11-250
3 x 525-690
(15-350 hp)
* Single-phase input - three-phase output.
Description of RFI filter types
C1: For use in domestic areas.
For use in industrial areas with own low-voltage
C3:
transformer.
RFI filter types are according to EN 61800-3.
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.
6.3.1 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 frequency
converter-driven motor.
Two types of output filters are available as accessories for CUE:
• dU/dt filters
• sine-wave filters.
Use of output filters
The table below shows when we recommend an output filter and
the type to use. The selection depends on the following:
• pump type
• motor cable length
• the required reduction of the acoustic noise from the motor.
Pump type
SP, BM, BMB with motor voltage from 380 V and up
Pumps with Grundfos motor MG71 and MG80 up to and including 1.5 kW (2 hp)
Applications with desired reduction of dU/dt and noise emission, low reduction
Applications with desired reduction of dU/dt, voltage peaks and noise emission, high reduction
Applications with motors of 500 V and up
* The lengths stated apply to the motor cable.
8
RFI filter type
C1
C1
C1
C3
C3
C3
dU/dt filter Sine-wave filter
- 0-300 m*
- 0-300 m*
0-150 m* -
- 0-300 m*
- 0-300 m*