Nidec E300 Series - Page 118

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118 Installation and System Design Guide
Issue Number: 1
Operation in the second environment
In all cases a shielded motor cable must be used, and an EMC filter is required for all drives with a rated input current of less than 100 A. The drive
contains an integral filter for basic emission control. In some cases feeding the motor cables (U, V and W) once through a ferrite ring can maintain
compliance for longer cable lengths. For longer motor cables, an external filter is required. Where a filter is required refer to Figure 2.10 EMC filters.
Where a filter is not required, follow the guidelines given in section 4.17 General requirements for EMC on page 116.
Detailed instructions and EMC information are given in section 2.10 EMC filters on page 25.
4.17.3 Sensitive control signal
The following information applies to sizes 3 to 11. Avoid placing sensitive signal circuits in a zone 300 mm (12 in) in the area immediately surrounding
the power module. Ensure good EMC grounding.
Figure 4-36 Sensitive signal circuit clearance
The second environment typically includes an industrial low-voltage power supply network which does not supply buildings used for
residential purposes. Operating the drive in this environment without an external EMC filter may cause interference to nearby electronic
equipment whose sensitivity has not been appreciated. The user must take remedial measures if this situation arises. If the consequences
of unexpected disturbances are severe, it is recommended that the guidelines in section 4.17.3 Sensitive control signal on page 118 be
adhered to.
CAUTION
Sensitive
signal
cable
≥ 300 mm
(12 in)