Emc-Compliant Installation - Danfoss VLT AutomationDrive FC 302 Design Manual

Electrical Installation Con...
10.14.4 EMC Compatibility
NOTICE
OPERATOR RESPONSIBILITY
According to the EN 61800–3 standard for variable-speed
drive systems, the operator is responsible for ensuring
EMC compliance. Manufacturers can offer solutions for
operation conforming to the standard. Operators are
responsible for applying these solutions, and for paying
the associated costs.
There are 2 options for ensuring electromagnetic compati-
bility.
•
Eliminate or minimize interference at the source
of emitted interference.
•
Increase the immunity to interference in devices
affected by its reception.
RFI filters
The goal is to obtain systems that operate stably without
radio frequency interference between components. To
achieve a high level of immunity, use drives with high-
quality RFI filters.
NOTICE
RADIO INTERFERENCE
In a residential environment, this product can cause
radio interference, in which case supplementary
mitigation measures may be required.
PELV and galvanic isolation compliance
All E1h–E4h drives control and relay terminals comply with
PELV (excluding grounded Delta leg above 400 V).
Galvanic (ensured) isolation is obtained by fulfilling
requirements for higher isolation and by providing the
relevant creepage/clearance distances. These requirements
are described in the EN 61800–5–1 standard.
Electrical isolation is provided as shown (see
Illustration 10.26). The components described comply with
both PELV and the galvanic isolation requirements.
MG38C202
Design Guide
8
1 Current transducers
2 Galvanic isolation for the RS485 standard bus interface
3 Gate drive for the IGBTs
4 Supply (SMPS) including signal isolation of V DC, indicating
the intermediate current voltage
5 Galvanic isolation for the 24 V back-up option
6 Opto-coupler, brake module (optional)
7 Internal inrush, RFI, and temperature measurement circuits
8 Customer relays
Illustration 10.26 Galvanic Isolation

10.15 EMC-compliant Installation

To obtain an EMC-compliant installation, follow the
instructions provided in the operating guide. For an
example of proper EMC installation, see Illustration 10.27.
NOTICE
TWISTED SHIELD ENDS (PIGTAILS)
Twisted shield ends increase the shield impedance at
higher frequencies, which reduces the shield effect and
increases the leakage current. Avoid twisted shield ends
by using integrated shield clamps.
•
•
•
Danfoss A/S © 01/2018 All rights reserved.
7 6 4 3
5 2
For use with relays, control cables, a signal
interface, fieldbus, or brake, connect the shield to
the enclosure at both ends. If the ground path
has high impedance, is noisy, or is carrying
current, break the shield connection on 1 end to
avoid ground current loops.
Convey the currents back to the unit using a
metal mounting plate. Ensure good electrical
contact from the mounting plate through the
mounting screws to the drive chassis.
Use shielded cables for motor output cables. An
alternative is unshielded motor cables within
metal conduit.
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