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Installation of the
frequency inverter in a
control cabinet
22 of 44
5 Installation at Site
TN-C-S
2
PE
3
1
Fig. 6: Design of protective earthing and functional earthing within the drive system
for installation of the frequency inverter in a control cabinet
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
6
Control cabinet
Local earthing of drive components (personal protection/low-frequency
potential equalisation)
Conventional earthing, PE conductor (personal protection/low-frequency
potential equalisation)
High-frequency potential equalisation between motor terminal box and
frequency inverter (shielding)
Functional earthing/low-impedance connection of all system components
(for high frequencies)
KSB IE4-Motor
6
4
5
PE
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