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2.2 Cabling of the Networks

2.2.1 BACnet MS/TP Cabling (NW #2)

To ensure correct functionality of the BACnet MS/TP

network, be sure to do the cabling correctly. Pay special

attention to mounting of the cable shield and to

termination of the network.

NOTICE

Never connect the shield to terminal 61 on the

frequency converter.

UBR-01

FC 102

B+ A- Shld

61 68 69

130BF304.11

30 A-

B+

Vacon 100

Illustration 2.2 Grounding Shielded Cables

Shielding of frequency converters connected to the same

ground potential

1. Use an adequate equalizing cable to eliminate

the risk of equalizing current running into the

shield of the BACnet cables.

2. Mount the shield at the terminal marked Shld on

the router.

3. On the frequency converters, connect the shield

to the ground shield brackets.

Shielding of frequency converters without the same

ground potential

If the frequency converters do not have the same ground

potential, only connect the shield to ground in 1 location.

Expect a lower EMC performance.

2.2.2 Ethernet Cabling (NW #1)

NOTICE

EMC INTERFERENCE

Use shielded cables for motor and control wiring, and

separate cables for eldbus communication, motor

wiring, and brake resistor. Failure to isolate eldbus

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 eldbus cable crosses a motor cable or a brake

resistor cable, ensure that the cables cross at an angle of

90°.

130BD866.12

≥200 mm (7.9 in) or

≥500 mm (20 in)

1 Ethernet cable

90° crossing

Illustration 2.3 Cable Routing

For the Ethernet, use standard shielded Cat5e patch cables.

Maximum cable length is 100 m (328 ft).

An Ethernet switch distributes the packets to the partic-

ipants on the Ethernet network. For industrial installation,

only use industrial graded products as other products may

cause faults and sporadic loss of communication.

Network BACnet MS/TP Communication with MBS UBR-01 Router