Installation and commissioning
DIGIDRIVE
Variable speed drive
30
Réf. 3218 GB - 4.33 / d - 02.02
LEROY-SOMER
3.5.7 - Additional precautions
Following the basic precautions in the
previous paragraph generally results in
correct operation of the installation.
However, even greater immunity can be
achieved by taking the following additional
precautions. These are listed in order of
importance.
3.5.7.1 - Insertion and wiring of an MC
choke
Most interference phenomena are caused
by high-frequency leakage currents
escaping to earth via the drive/motor cable
and via the metal structures supporting the
motor.
MC chokes can be used to reduce these
leakage currents. Their role is even more
important when the drive/motor cable is
very long.
Use MC chokes with a standard cable no
more than 100 m long.
Place the MC choke as near the drive as
possible.
Drive ratings MC choke
0.5M to 1.5M
3.5T
1.5M/TL and 2M/TL
1.5T to 3.5T
2.5M/TL and 3.5M/
11T
4.5T to 11T
5.5TL to 11TL
27T
16T to 27T
33T to 50T 50T
3.5.7.2 - RFI filter
The RFI filter contributes to a reduction in the emission levels of the radio frequency signals
on the power supply cable, but its role in handling interference phenomena is fairly limited.
Depending on the drive used, install the RFI filter recommended in the table below between
the mains and the drive input.
• Precautions when mounting the filter
- Place the filter as near the drive as possible.
- Mount the type 1 filter directly on the same grille or same base plate as the drive.
- Mount the type 2 filter at the back or on the side of the drive.
• Precautions when wiring the filter
- The maximum length of the cable to the drive should be 0.3 m.
- Separate mains cables from motor cables.
- Wire up the earth: input to the cabinet general earth, output to the drive earth.
DIGIDRIVE ratings
Type 1 filters Type 2 filters
Length of
Reference
Length of
Reference
motor cables motor cables
(m) (m)
0.5M to 1.5M 1 to 20 FLT 5594 - 12 1 to 75 FLT 5581 - 12
1.5M/TL to 3.5M/TL (1-ph) 1 to 50 FLT 5594 - 26 1 to 100 FLT 5581 - 26
1.5M/TL to 3.5M/TL (3-ph) 1 to 15 FLT 5901 - 17 1 to 100 FLT 5569 - 16
5.5TL 1 to 15 FLT 5901 - 30 1 to 100 FLT 5569 - 26
1.5T to 5.5TL 1 to 15 FLT 5901 - 17 1 to 100 FLT 5569 - 16
8TL and 11TL 1 to 15 FLT 5901 - 30 1 to 100 FLT 5569 - 30
8T and 11T 1 to 15 FLT 5901 - 17 1 to 100 FLT 5569 - 17
16T and 22T 1 to 15 FLT 5901 - 33 1 to 100 FLT 5569 - 33
27T 1 to 20 FLT 5901 - 37 1 to 100 FLT 5569 - 37
33T - - 1 to 100 FLT 5113 - 50
40T - - 1 to 100 FLT 5113 - 63
50T - - 1 to 100 FLT 5113 - 100
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