4
Variable frequency inverter controlled pumps/mixers
In installations utilising variable frequency inverters for
speed control of pumps, interference from a variable
frequency drive (VFD) may cause nuisance tripping of
monitoring equipment and the electronic sensor CLS.
VFD-interference does not affect FLS and FLS10.
Interference occurs when the pilot cores are in close
proximity to the power cores.
The interference may be suppressed by connecting a
suitable filter
1
between the monitoring conductors (T1,
T2) and ground (PE).
The filter should ideally be situated in the pump/mixer
junction box.
Cables containing both power and pilot cores should
be kept to a minimum length.
The power cable and control cable should be run in
separate cable ducts with a distance of at least
300 mm between them.
Our pumps are CE-marked according to EMC-direc-
tive and the VFD that we buy from a subcontractor
should also be CE-marked. In order to make the VFD
pass the EMC-tests the interconnecting cable be-
tween pump and VFD has to be screened.
1
Available filter kits:
Part no. 6046800
Will fit: 3102, 3127, 4430.
Part no. 6046801
Will fit: 3085, 4410.
Part no. 6046802
Will fit: 3140, 3152, 3170, 3201, 3300.
Part no. 6046804
Will fit: 3231, 3306, 3312, 3351, 3356, 3400, 3501,
3602, 3800, 7045, 7061, 7081, 7101, 7115, 7121.
Part no. 6616000
Will fit: 4630, 4640, 4650, 4660.
Part no. 6616001
Will fit: 4670, 4680.
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