Design Guide | VLT® AutomationDrive FC 360
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.
l 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.
l 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.
l Use shielded cables for motor output cables. An alternative is unshielded motor cables within metal conduit.
NOTICE
SHIELDED CABLES
If shielded cables or metal conduits are not used, the unit and the installation do not meet regulatory limits on radio frequency
(RF) emission levels.
l Ensure that motor and brake cables are as short as possible to reduce the interference level from the entire system.
l Avoid placing cables with a sensitive signal level alongside motor and brake cables.
l For communication and command/control lines, follow the particular communication protocol standards. For example, USB must
use shielded cables, but RS485/ethernet can use shielded UTP or unshielded UTP cables.
l Ensure that all control terminal connections are PELV.
NOTICE
EMC INTERFERENCE
Use shielded cables for motor and control wiring. Make sure to separate mains input, motor, and control cables from one another.
Failure to isolate these cables can result in unintended behavior or reduced performance. Minimum 200 mm (7.9 in) clearance
between mains input, motor, and control cables are required.
NOTICE
INSTALLATION AT HIGH ALTITUDE
There is a risk of overvoltage. Isolation between components and critical parts could be insufficient and not comply with PELV
requirements. Reduce the risk of overvoltage by using external protective devices or galvanic isolation.
l For installations above 2000 m (6500 ft) altitude, contact Danfoss regarding PELV compliance.
NOTICE
PELV COMPLIANCE
Prevent electric shock by using protective extra low voltage (PELV) electrical supply and complying with local and national PELV
regulations.
Danfoss A/S © 2024.01 AJ435824192086en-000101 / 130R1295 | 71
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