Delta C2000 series User Manual page 618

Classical field oriented control ac motor drive

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3. Common-mode noise is coupled via the power cable to other power systems then the cable of such a

power system is coupled to the transmission system, as shown in Figure 3.

4. The common-mode noise of an unshielded power cable is transmitted to the ground via the stray

capacitance. Since both shielded wire and unshielded wire are connected to a common ground, other

systems can be interfered with by the common-mode noise that is transmitted from the ground back

to the system via the shield. See Figure 4.

5. When excessive pulse modulated currents pass through an un-grounded AC drive cable, it acts as an

antenna and creates radiated interference.

Unshielded cable

Unshielded cable

Unshielded cable