Pe Current Measurement - Danfoss iC2-Micro Series Design Manual

Design Guide | iC2-Micro Frequency Converters

PE Current Measurement

7.3.3
As the currents have different frequencies, it is not useful to measure an effective value only. Instead, it is required to perform a
frequency/FFT measurement. This can be done by using an appropriate oscilloscope or specific measuring equipment. Just analyzing the
effective value with a current clamp at the PE connection of the drive leads to insufficient and misleading results.
1 2
Figure 38: Example of FFT Measurement
1 f < 50 Hz: Typical for inductive coupling in unsymmetrical
cables and conductor.
3
f > 2 kHz: Typical common-mode current due to capacitive
coupling between cable/motor and ground.
Danfoss A/S © 2024.08
3
2 f = 150–2500 Hz: Typical harmonic components in grid.
f = 150 Hz: Common-mode current typical due to rectifier
with DC link.
AJ402315027937en-000401 / 130R1239 |
Electrical Installation Considerations
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