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Mounting the frequency
inverter on the motor
5 Installation at Site
3
5
4
Fig. 7: Design of protective earthing and functional earthing within the drive system
for mounting the frequency inverter on the motor
1
Drive system (motor + pump)
2
Transformer/power supply
3
Central protective earth electrode / hall/foundation earth electrode
4
Central functional earth electrode
5
Frequency inverter
Local earthing of drive components (personal protection/low-frequency
potential equalisation)
Conventional earthing, PE conductor (personal protection/low-frequency
potential equalisation)
Functional earthing/low-impedance connection of all system components
(for high frequencies)
When connecting the electric machine, ensure that it is connected in a high
frequency-compatible manner.
This requires 360-degree connection of the motor supply cable's electrical shield on
the motor and frequency inverter side.
Additional information and measures for reducing the bearing current loads of
electrical machines during inverter operation or the implementation of functional
earthing between the frequency inverter and motor connection are listed in IEC
60034-25 or DIN VDE 0530-25 ("AC electrical machines used in power drive systems –
Application guide").
KSB IE4-Motor
TN-C-S
2
PE
1
23 of 44
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