The shield on the power/connection cable must consist of a single piece and be
earthed at both ends either just on the appropriate earth terminal or on the earth
bus bar (do not connect it to the earth bus bar in the control cabinet).
The shielded cable ensures that the high-frequency current, which normally flows as
a discharge current from the motor housing to earth or between the individual
conductors, now flows through the shielding.
The shield for the control cable (connection on PumpDrive side only) also serves as
protection against radiated emission.
If you are using shielded cables to improve interference immunity, also use a wide
contact face for the different earth connections.
In applications with long shielded motor cables, additional reactive resistors or
output filters must be provided to compensate the capacitive stray current to earth
and reduce the rate of voltage rise on the motor. These measures help reduce radio
frequency interference further. Using just ferrite rings or reactive resistors does not
ensure compliance with the limit values defined in the EMC directive.
NOTE
If you are using shielded cables that are longer than 10 metres, check the stray
capacitance to ensure that the diffusion between the phases or to earth is not
excessive, which could cause PumpDrive to stop.
Route control cable and power/motor connection cable in separate cable ducts.
When routing the control cable observe a minimum distance of 0.3 metres between
the control cable and the power/motor connection cables.
If you cannot avoid crossing control and power/motor connection cables, you should
cross them at 90 degrees to each other.
5.4.2.4
Earth connection
PumpDrive must be properly earthed.
To ensure greater interference immunity, a wide contact face is required for the
different earth connections.
In the case of cabinet mounting, use two separate copper earth bus bars (mains
power/motor connection and control connection bar) with a suitable size and cross-
section for earthing PumpDrive. All the earth conductors are connected to these.
The bars are connected to the earthing system at one point only.
The control cabinet is then earthed via the mains earthing system.
5.4.2.5
Line chokes
The line input currents indicated are for orientation only; they refer to operation at
nominal rating. These currents may vary depending on the actual line impedance. In
low-impedance mains, higher currents may occur.
To limit the line input current, external line chokes can be used alongside the line
chokes already integrated (in the power range up to and including 45 kW). Line
chokes also reduce mains feedback and improve the power factor. The scope of DIN
EN 61000-3-2 must be heeded.
Appropriate line chokes are available from KSB. (
5.4.2.6
Output filter
The maximum cable lengths must be maintained in order to meet RFI suppression
requirements to EN 55011. Output filters are required if the maximum cable lengths
are exceeded.
Technical data available on request. (
Routing cables
5 Installation at Site
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PumpDrive
