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Installation
3 Installation
3.1 Safety Instructions
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See chapter 2 Safety for general safety instructions.
3.2 EMC-compliant Installation
To obtain an EMC-compliant installation, follow the
instructions provided in the relevant frequency converter
operating instructions and design guide. Refer to the
BACnet/IP master manual from the BMS supplier for further
installation guidelines.
3.3 Grounding
•
Ensure that all stations connected to the fieldbus
network are connected to the same ground
potential. When there are long distances between
the stations in a fieldbus network, connect the
individual station to the same ground potential.
Install equalizing cables between the system
components.
•
Establish a grounding connection with low HF
impedance, for example by mounting the
frequency converter on a conductive backplate.
•
Keep the ground wire connections as short as
possible.
•
Electrical contact between the cable screen and
the frequency converter enclosure or ground is
not allowed in Ethernet installations. The RJ45
connector of the Ethernet interface provides an
electrical path for the burst transient to ground.
•
To reduce burst transient, use high-strand wire.
3.4 Cable Routing
NOTICE
EMC INTERFERENCE
Use shielded cables for motor and control wiring, and
separate cables for fieldbus communication, motor
wiring, and brake resistor. Failure to isolate fieldbus
communication, motor, and brake resistor cables can
result in unintended behavior or reduced performance.
Minimum 200 mm (7.9 in) clearance between power,
motor, and control cables is required. For power sizes
above 315 kW (450 hp), increase the minimum distance
to 500 mm (20 in).
NOTICE
When the fieldbus cable crosses a motor cable or a brake
resistor cable, ensure that the cables cross at an angle of
90°.
6
®
VLT
BACnet/IP MCA 125
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2
Illustration 3.1 Cable Routing
Danfoss A/S © 05/2016 All rights reserved.
≥200 mm (7.9 in)
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2
Ethernet cable
90° crossing
MG92K102
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